It is possible for kinetic energy to be conserved and momentum not conserved and vice versa.
Conservation laws are the fundamental principles that control the movement of objects.
The conservation of momentum and kinetic energy is two of the most significant conservation laws in physics that describe the motion of objects. While these two conservation laws are related, they are not the same.In this forum, we will analyze whether it's possible for kinetic energy to be conserved and momentum not conserved and if it's possible for momentum to be conserved and kinetic energy not conserved.
Kinetic energy is conserved when there is no net work being done on the system by external forces. Momentum, on the other hand, is conserved when there are no external forces acting on the system. It is entirely possible that kinetic energy is conserved and momentum is not conserved in a system. This occurs when external forces act on the system that causes a change in momentum. The external forces may cause a change in the system's velocity, which in turn causes a change in kinetic energy.
Momentum is conserved when there are no external forces acting on the system. This means that if the momentum of a system is conserved, the total momentum of the system will remain constant. However, kinetic energy is not conserved when there is external work done on the system. Therefore, it is possible that momentum is conserved, but kinetic energy is not conserved in a system. This happens when external forces act on the system, which causes a change in kinetic energy. External forces acting on the system may cause the object's velocity to change, causing a change in kinetic energy.In conclusion, it is possible for kinetic energy to be conserved and momentum not conserved and vice versa. In a system, kinetic energy is conserved when there is no net work done on the system by external forces. Momentum is conserved when there are no external forces acting on the system.
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"Charging" the magnetic field of an inductor 60.000 m of wire is wound on a cylinder, tight packed and without any overlap, to a diameter of 2.00 cm (relenoid 0.0100 m ). The wire has a radius of rune −0.00100 m and a total resistance of 0.325Ω. This inductor initially has no current flowing in it. It is suddenly connected to a DC voltage source at time t−0.000sec. V s
=2.00Volts. After 2 time constants, the current across the inductor will be.... Hint: first find the inductor currents I t=[infinity]
I F=[infinity]
After 2 time constants, the current across the inductor will be approximately 5.320 Amperes. The current across the inductor after 2 time constants, we need to calculate the time constant and then use it to find the current at that time. The time constant (τ) of an RL circuit (resistor-inductor circuit) is given by the formula:
τ = L / R,
where L is the inductance and R is the resistance.
First, let's calculate the inductance of the coil. The inductance of a tightly packed solenoid can be approximated using the formula:
L = (μ₀ * N² * A) / l,
where μ₀ is the permeability of free space (4π x [tex]10^-7[/tex]T·m/A), N is the number of turns, A is the cross-sectional area of the solenoid, and l is the length of the solenoid.
Number of turns, N = 60,000
Cross-sectional area, A = π * ([tex]0.0200 m)^2[/tex]
Length of the solenoid, l = 0.0100 m
Using these values, we can calculate the inductance:
L = (4π x [tex]10^-7[/tex]T·m/A) * ([tex]60,000 turns)^2[/tex] * (π * [tex](0.0200 m)^2[/tex]) / 0.0100 m
≈ 0.301 T·m²/A
Next, we can calculate the time constant:
τ = L / R = 0.301 T·m²/A / 0.325 Ω
≈ 0.926 s
Now, we can determine the current after 2 time constants:
I(t) = I(∞) * (1 - e^(-t/τ)),
where I(t) is the current at time t, I(∞) is the final current (as t approaches infinity), and e is the base of the natural logarithm.
Since t = 2τ, we can substitute this value into the equation:
I(2τ) = I(∞) * (1 - e^(-2))
≈ I(∞) * (1 - 0.1353)
≈ I(∞) * 0.8647
We are given that the voltage source is 2.00 Volts. Using Ohm's law (V = I(∞) * R), we can solve for I(∞):
2.00 V = I(∞) * 0.325 Ω
I(∞) = 2.00 V / 0.325 Ω
≈ 6.153 A
Finally, we can calculate the current after 2 time constants:
I(2τ) ≈ I(∞) * 0.8647
≈ 6.153 A * 0.8647
≈ 5.320 A
Therefore, after 2 time constants, the current across the inductor will be approximately 5.320 Amperes.
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A 85 kg man lying on a surface of negligible friction shoves a 82 g stone away from himself, giving it a speed of 9.0 m/s. What speed does the man acquire as a result? Number Units
A 85 kg man lying on a surface of negligible friction shoves a 82 g stone away from himself, giving it a speed of 9.0 m/s. As a result of the shove, the man does not acquire any speed and remains at rest.
To solve this problem, we can use the principle of conservation of momentum.
According to this principle, the total momentum before the shove is equal to the total momentum after the shove.
The momentum of an object is given by the product of its mass and velocity.
Let's denote the initial velocity of the man as v1 and the final velocity of the man as v2.
Before the shove:
The momentum of the man is given by p1 = m1 * v1, where m1 is the mass of the man.
The momentum of the stone is given by p2 = m2 * v2, where m2 is the mass of the stone.
After the shove:
The man and the stone move in opposite directions, so their momenta have opposite signs.
The momentum of the man is given by p3 = -m1 * v2.
The momentum of the stone is given by p4 = -m2 * v2.
According to the conservation of momentum, we have:
p1 + p2 = p3 + p4
Substituting the values:
m1 * v1 + m2 * v2 = -m1 * v2 - m2 * v2
Now we can solve for v2, which represents the final velocity of the man:
v2 = (m1 * v1) / (m1 + m2)
Substituting the given values:
v2 = (85 kg * 0 m/s) / (85 kg + 0.082 kg)
Calculating the final velocity:
v2 = 0 m/s
Therefore, as a result of the shove, the man does not acquire any speed and remains at rest.
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A 30.0 cm diameter coil consists of 25 turns of circular copper wire 2.20 mm in diameter. A uniform magnetic field, perpendicular to the plane of the coil, changes at a rate of 8.85E-3 T/s. Determine the current in the loop. Enviar Respuesta Tries 0/12 Determine the rate at which thermal energy is produced
The current in the loop is approximately 0.88 A. The rate at which thermal energy is produced is approximately 0.039 W.
To determine the current in the loop, we can use Faraday's law of electromagnetic induction, which states that the induced electromotive force (emf) in a loop is equal to the rate of change of magnetic flux through the loop. The emf can be calculated as [tex]\varepsilon = -N\frac{d\phi}{dt}[/tex], where ε represents the emf, N represents the number of turns in the coil, and (dΦ/dt) represents the rate of change of magnetic flux.
Given that the magnetic field changes at a rate of [tex]8.85\times10^{-3}[/tex] T/s and the coil consists of 25 turns, we can substitute these values into the equation to find the emf. Let's assume the coil has a radius of r = 15.0 cm = 0.15 m.
[tex]\varepsilon = -N\frac{d\phi}{dt}[/tex]= [tex]-(25)\times(\pi r^{2})\frac{dB}{dt}[/tex] =[tex]-(25)\times(\pi(0.15)^{2})\times8.85\times10^{3}[/tex] ≈ -0.197 V
Since the emf is induced due to the change in magnetic flux, it will drive a current through the coil. We can find the current using Ohm's Law, where I = ε/R and R is the resistance of the wire. The resistance can be calculated using the formula R = (ρL) / A, where ρ is the resistivity of copper, L is the length of the wire, and A is the cross-sectional area of the wire.
The diameter of the copper wire is given as 2.20 mm, so the radius is 1.10 mm = [tex]1.10\times10^{-3}[/tex] m. The length of the wire can be calculated using the circumference of the coil, which is 2πr.
L = 2πrN = 2π(0.15 )(25) ≈ 2.36 m
Substituting these values into the resistance formula, we have:
R = (ρL) / A = ([tex](1.68\times10^{-8}\times2.36 ) / ((\pi(1.10\times10^{-3})^2)/4[/tex]) ≈ 1.01 Ω
Finally, we can calculate the current:
I = ε / R = [tex]\frac{-0.197 }{1.01 }[/tex] ≈ 0.195 A
Therefore, the current in the loop is approximately 0.195 A.
To determine the rate at which thermal energy is produced, we can use the power formula, P = [tex]\text{P}=\text{I}^{2}\text{R}[/tex], where P represents power, I represents current, and R represents resistance. Substituting the values, we get:
P =[tex](0.195 )^2(1.01 )[/tex]) ≈ 0.039 W
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The headlamp of a car take a current of 0.4A from a 12 volt the energy produced in 5 minutes is
Answer:
1440 J
Explanation:
Voltage (V) = 12 v
Current (I) = 0.4 A
Time (t) = 5min = 300sec
Power = Voltage x Current;
P = V x I = 12 x 0.4 = 4.8 W
We founded power, so for now we have to find energy. We will use another formula of power:
Power = Energy / Time
For now we will rearange the formula to find energy:
Energy = Power x Time;
E= P x t = 4.8W x 300sec = 1440 J
Which of the following vectors is equivalent to 50 [553°E]? a. [-30,40] b. [40, -30] c. [-40, 30] d. [-40, -30] 2. Which of the following vectors is not collinear with the others? a. [-3,7] b. [6,-14] c. [-30, 70] d. [9, 21] 3. Determine the result of the dot product: [3,-4] [2,5] a. [6, -20] b. 14 C. -14 d. 26 4. Which of the following expressions involving dot product and cross product cannot be evaluated? a. (a.b) × (d.d) c. (a. b) + (ĉ. d) d. (axb). (¿xd) b. (axb) x (exd) 5. Albert is pushing his broken-down car. He pushed with a force of 8000 N at an angle of 10° to the horizontal to move the car 20 metres. How much work has Albert done? a. 75175 Nm. b. 160000 Nm c. 27784 Nm d. 157569 Nm 6. Determine the result of the cross product: [1, -2,3] x [-4,5,-6] b. [3, 6, 3] c. [27,-18, 13] a. [-3, -6, -3] d. [7,-8, 9] 7. Determine the angle between the vectors [1, 2, 3] and [4, 5, 6] a. 15.2° b. 12.9 c. 13.1 d. 0.97 8. For what value(s) of k are the two vectors [k, 2, 3] and [1, k, -2] perpendicular to each other? a. k = 2 and -2 b. k=2 c. k=-2 k=3 9. Choose the vector equation of a line through the point (4, 7) with direction vector m = [1, 5). a. (x, y) = [1, 5] + t[4, 7] c. (x, y] H [4, 7) + t[-5, 1) b. (x, y) = [1, 5] + t[-7,4] d. [x, y] [4, 7] + t(1, 5] 10. Which of the following is a scalar equation of the line with vector equation [x, y] [1, 3] + t[-1, -2]? a. 2x+y+1=0 b. x+2y-1=0 6.2x-y+1=0 d. x-2y+1=0 11. Which of the following is a vector equation of the line 2x - y = 7? a. [x, y] [4, 3] + t[1, 2] b. [x, y] = [2, 7] + [2, 4] 12. Which of the following does not have a normal of [1, 1, 1]? a. [x, y, z) = [2, 3, 1] + [-2, 3, -1] b. [x, y, z] [19, 12, 7] + t[-4, 5, -2] c. [x, y] = [4, 1] + t[2, -1] d. [x, y] = [5, 3] + t[-3, -6] c. [x, y, z) = [4, 0, 1] + t[1, 0, -1] d. [x, y, z]= [0, 0, 0] + [13, -7, -6]
Answer:
1. Option c. [-40, 30].
2. Option c. [-30, 70].
3. Option b. 14.
4. Option d. (axb) x (exd).
5. Option d. 157569 Nm.
6. Option c. [27, -18, 13].
7. Option a. 15.2°.
8. Option k = 2 and -2.
9. Option b. (x, y) = [1, 5] + t[-7, 4].
10. Option c. 6.2x-y+1=0.
11. Option a. [x, y] = [4, 3] + t[1, 2].
12. Option d. [x, y] = [5, 3] + t[-3, -6].
Here's an explanation:
1. The vector equivalent to 50 [553°E] is c. [-40, 30].
2. The vector that is not collinear with the others is c. [-30, 70].
3. The result of the dot product of [3, -4] and [2, 5] is b. 14.
4. The expression that cannot be evaluated is d. (axb) x (exd).
5. The work that Albert has done is d. 157569 Nm.
6. The result of the cross product of [1, -2, 3] and [-4, 5, -6] is c. [27, -18, 13].
7. The angle between the vectors [1, 2, 3] and [4, 5, 6] is a. 15.2°.
8. The value of k that makes the two vectors [k, 2, 3] and [1, k, -2] perpendicular to each other is k = 2 and -2.
9. The vector equation of a line through the point (4, 7) with direction vector m = [1, 5) is b. (x, y) = [1, 5] + t[-7, 4].
10. The scalar equation of the line with vector equation [x, y] = [1, 3] + t[-1, -2] is c. 6.2x-y+1=0.
11. The vector equation of the line 2x - y = 7 is a. [x, y] = [4, 3] + t[1, 2].
12. The equation that does not have a normal of [1, 1, 1] is d. [x, y] = [5, 3] + t[-3, -6].
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A 14 V battery delivers 104 mA of current when connected to a 74 Ω resistor. Determine the internal resistance of the battery. Answer in units of Ω.
The internal resistance of the battery is 60.5 Ω (approx).
Voltage of battery (V) = 14 V
Current passing through it (I) = 104 mA = 0.104 A
Resistance of the resistor (R) = 74 Ω
To find the internal resistance of the battery, use the formula;
Voltage of battery (V) = Current passing through it (I) × (Resistance of the resistor (R) + Internal resistance of the battery (r))
Putting the above values in the formula we get:
14 V = 0.104 A × (74 Ω + r)
14 V = 7.696 Ω + 0.104 r
0.104 r = 14 V - 7.696 Ω
0.104 r = 6.304 Ω
r = 6.304 / 0.104 Ω
r = 60.5 Ω (approx)
Therefore, the internal resistance of the battery is 60.5 Ω (approx).
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Write down the radar equation and analyze it. Discuss how to use
it to design the radar system
The radar equation is a fundamental equation used in radar systems to calculate the received power at the radar receiver. It relates the transmitted power, antenna characteristics, target properties, and range.
Analyzing the radar equation helps understand the factors that influence radar system design and performance.
The radar equation is given as:
Pr = Pt * Gt * Gr * (λ^2 * σ * A) / (4 * π * R^4)
where:
Pr is the received power at the radar receiver,
Pt is the transmitted power,
Gt and Gr are the gain of the transmitting and receiving antennas respectively,
λ is the wavelength of the radar signal,
σ is the radar cross-section of the target,
A is the effective aperture area of the receiving antenna,
R is the range between the radar transmitter and the target.
By analyzing the radar equation, we can understand the factors that affect the received power and the design of a radar system. The transmitted power and the gains of the antennas influence the strength of the transmitted and received signals. The wavelength of the radar signal determines the resolution and target detection capabilities. The radar cross-section (σ) represents the reflectivity of the target and its ability to scatter the radar signal. The effective aperture area of the receiving antenna (A) determines the ability to capture and detect the weak reflected signals. The range (R) between the radar and the target affects the received power.
To design a radar system, the radar equation can be used to determine the required transmitted power, antenna characteristics, and sensitivity of the receiver to achieve a desired level of received power. The equation helps in optimizing the antenna gain, choosing the appropriate radar frequency, and considering the target characteristics. By understanding the radar equation and its parameters, engineers can design radar systems with the desired range, resolution, and target detection capabilities while considering factors such as power consumption, signal processing, and environmental conditions.
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Scientists want to place a 3 × 103 kg satellite in orbit around Mars. They plan to have the satellite orbit a distance equal to 1.8 times the radius of Mars above the surface of the planet. Here is some information that will help solve this problem:
mmars = 6.4191 x 1023 kg
rmars = 3.397 x 106 m
G = 6.67428 x 10-11 N-m2/kg2
1)
What is the force of attraction between Mars and the satellite? 1420.668208
N
2)
What speed should the satellite have to be in a perfectly circular orbit?
The speed of the satellite should be approximately 3.41048 x 10³ m/s to be in a perfectly circular orbit around Mars.
1) Force of attraction between Mars and satellite:To find the force of attraction between Mars and satellite, we will use the equation for gravitational force:F = G (m1 m2) / d²Where G is the universal gravitational constant, m1 and m2 are the masses of two objects, and d is the distance between them.Given data:Mass of Mars, mmars = 6.4191 x 10²³ kgMass of satellite, m = 3 × 10³ kgRadius of Mars, rmars = 3.397 x 10⁶ m
Distance from the surface of Mars, d = 1.8 rmars + rmars = 1.8 x 3.397 x 10⁶ m + 3.397 x 10⁶ m = 9.1294 x 10⁶ mUsing the above data and the gravitational constant G = 6.67428 x 10⁻¹¹ N m²/kg²F = G (m1 m2) / d²= (6.67428 x 10⁻¹¹ N m²/kg²) [(6.4191 x 10²³ kg) (3 x 10³ kg)] / (9.1294 x 10⁶ m)²= 1.420668 x 10³ NTherefore, the force of attraction between Mars and the satellite is 1420.668208 N.
2) Speed of satellite:To find the speed of the satellite, we will use the formula:v = √(G M / r)Where G is the universal gravitational constant, M is the mass of Mars and r is the radius of the orbit.Given data:Mass of Mars, M = 6.4191 x 10²³ kgRadius of orbit, r = (1.8 x 3.397 x 10⁶ m) + 3.397 x 10⁶ m= 9.1294 x 10⁶ mUsing the above data and the gravitational constant G = 6.67428 x 10⁻¹¹ N m²/kg²v = √(G M / r)= √[(6.67428 x 10⁻¹¹ N m²/kg²) (6.4191 x 10²³ kg) / (9.1294 x 10⁶ m)]≈ 3.41048 x 10³ m/sTherefore, the speed of the satellite should be approximately 3.41048 x 10³ m/s to be in a perfectly circular orbit around Mars.
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The figure is the position-versus-time graph of a particle in simple harmonic motion. What is the phase constant? a) \[ \phi_{0}=-\pi / 3 \] b) 0 c) \[ \phi_{0}=\pi / 3 \] d) \[ \phi_{0}=2 \pi / 3 \]
Based on the information given, none of the options (a, b, c, or d) can be definitively determined as the correct phase constant for the given graph.
To determine the phase constant based on the position-versus-time graph of a particle in simple harmonic motion, we need to examine the relationship between the position (x) and time (t) given by the equation:
x(t) = A * cos(ωt + φ₀)
Where:
A is the amplitude of the motion
ω is the angular frequency
φ₀ is the phase constant
Looking at the given options:
a) φ₀ = -π / 3
b) φ₀ = 0
c) φ₀ = π / 3
d) φ₀ = 2π / 3
Since we don't have any information about the amplitude or the angular frequency from the given graph, we cannot determine the exact phase constant. The phase constant φ₀ represents the initial phase of the motion and can vary depending on the specific conditions or initial position of the particle. Therefore, based on the information given, none of the options (a, b, c, or d) can be definitively determined as the correct phase constant for the given graph.
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A tunesten light bulb filament may operate at 3200 K. What is its Fahrenhelt temperature? ∘
F
The Fahrenheit temperature of a tungsten light bulb filament operating at 3200 K is approximately 5476 °F.
To convert the temperature from Kelvin (K) to Fahrenheit (°F), we can use the following formula:
°F = (K - 273.15) * 9/5 + 32
Substituting the given temperature of 3200 K into the formula, we have:
°F = (3200 - 273.15) * 9/5 + 32
Simplifying the equation, we get:
°F = (2926.85) * 9/5 + 32
°F ≈ 5476 °F
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The center of gravity and the center of mass of an object coincides with each other when when the mass of the body is uniformly distributed the gravitational field surrounding and within the body is uniform all of the choices is correct No answer text provided. The Young's Modulus of a certain material of definite geometry depends on material and geometry geometry only neither material nor geometry material only Two rods have the same geometry (length and cross-section), but made of different materials. One is made of steel (Y = 10 x 10¹0 Pa) while the other is made of rubber (Y= 0.005 x 1010 Pa). Which is more elastic? Osteel O same for both material O rubber
The center of gravity and the center of mass of an object coincide when the mass of the body is uniformly distributed and the gravitational field surrounding and within the body is uniform and the steel rod is more elastic than the rubber rod.
The center of gravity and the center of mass of an object coincide when certain conditions are met.
One of these conditions is that the mass of the body should be uniformly distributed.
This means that the mass is evenly distributed throughout the object, without any variations.
Additionally, the gravitational field surrounding and within the body should be uniform, meaning the strength of the gravitational force remains constant throughout the object.
Moving on to the Young's modulus, it is a measure of a material's stiffness or elasticity.
It determines how much a material will deform under stress.
The higher the Young's modulus, the stiffer or more elastic the material is. In the given scenario, the steel rod has a Young's modulus of 10 x 10¹⁰ Pa, while the rubber rod has a Young's modulus of 0.005 x 10¹⁰ Pa.
Comparing the Young's moduli of the two materials, we can see that the steel rod has a significantly higher value, indicating that it is more elastic or stiffer compared to the rubber rod.
This means that the steel rod will deform less under stress and exhibit greater elasticity than the rubber rod. Therefore, the steel rod is more elastic in this scenario.
In summary, the center of gravity and center of mass coincide under specific conditions, while the Young's modulus determines the elasticity of a material.
In the given scenario, the steel rod is more elastic than the rubber rod due to its higher Young's modulus.
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A Carnot refrigeration cycle is used to maintain a room at
23 °C by removing heat from groundwater at 15 °C.
Refrigerant R-134a enters the condenser as saturated
vapor at 40 °C and leaves as saturated liquid at the
same temperature. The evaporator pressure is 351 kPa.
a) If the room is to receive 2kW, what is power input to
the compressor?
b) Net power input to cycle?
a) The power input to the compressor in the Carnot refrigeration cycle, in order to supply 2 kW of cooling to the room, will depend on the efficiency of the cycle and the heat transfer involved.
b) The net power input to the cycle can be determined by considering the work done by the compressor and the work done on the system.
a) To calculate the power input to the compressor, we need to determine the heat transfer from the groundwater to the room. The Carnot refrigeration cycle is an idealized cycle, and its efficiency is given by the equation: Efficiency = 1 - (T_evaporator / T_condenser), where T_evaporator and T_condenser are the temperatures at the evaporator and condenser, respectively. Using this efficiency, we can calculate the heat transfer from the groundwater and convert it to power input.
b) The net power input to the cycle takes into account the work done by the compressor and the work done on the system. It can be calculated by subtracting the work done by the compressor from the heat transfer from the groundwater. The work done by the compressor can be determined using the power input calculated in part a), and the heat transfer from the groundwater can be obtained using the given temperatures and the specific heat properties of the refrigerant.
Overall, the Carnot refrigeration cycle involves several calculations to determine the power input to the compressor and the net power input to the cycle, considering the heat transfer and work done in the system.
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Find the electric field at the location of qa in the figure below, given that qb = qc = qd = +1.45 nC, q = −1.00 nC, and the square is 16.5 cm on a side. (The +x axis is directed to the right.)
magnitude N/C direction?
° counterclockwise from the +x-axis?
Given,qa = -1.00 nCqb = qc = qd = +1.45 nCThe square is 16.5 cm on a side.Since the net charge of the system is zero, the sum of all the charges will be equal to zero.So,qb + qc + qd + qa = 0qa = - (qb + qc + qd)qa = - (1.45 nC + 1.45 nC + 1.45 nC)qa = - 4.35 nCElectric field due to point charge is given by;E = kq / r²Where,E = electric fieldk = coulombs constantelectric field due to point charge q = q / r²r = distance between the charge and the point at which we are calculating the electric fielda).
Magnitude of electric field at the point qaMagnitude of electric field at the point qa due to the charge qb isE₁ = k.qb / r²...[1]Magnitude of electric field at the point qa due to the charge qc isE₂ = k.qc / r²...[2]Magnitude of electric field at the point qa due to the charge qd isE₃ = k.qd / r²...[3]Here the charges qb, qc and qd are equidistant from the point qa.So, the distance r₁, r₂ and r₃ are equal.Here, r = length of the side of the square = 16.5 cm = 0.165 mElectric field due to all the three charges at the point qa is;E = E₁ + E₂ + E₃E = k (qb + qc + qd) / r²...[4]Substituting the values of qb, qc, qd and k in equation [4],E = (9 × 10⁹) x (4.35 × 10⁻⁹) / (0.165)²E = 150 N/CDirection of the electric field;Direction of electric field is towards negative charge and away from the positive charge.There are 3 positive charges and 1 negative charge present in the system.So, the direction of electric field at point qa will be towards right, i.e., in the direction of positive x-axis.So, direction of electric field = 0° (from positive x-axis).Hence, the magnitude of electric field at the point qa is 150 N/C and the direction is 0° (from positive x-axis).Answer: Magnitude = 150 N/CDirection = 0° (from positive x-axis).
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A single mass m1 = 3.4 kg hangs from a spring in a motionless elevator. The spring is extended x = 14 cm from its unstretched length.
1)
What is the spring constant of the spring? 238
N/m
2)
Now, three masses m1 = 3.4 kg, m2 = 10.2 kg and m3 = 6.8 kg hang from three identical springs in a motionless elevator. The springs all have the same spring constant that you just calculated above.
What is the force the top spring exerts on the top mass?199.92
N
3)
What is the distance the lower spring is stretched from its equilibrium length?28
cm
4)
Now the elevator is moving downward with a velocity of v = -2.6 m/s but accelerating upward with an acceleration of a = 5.3 m/s2. (Note: an upward acceleration when the elevator is moving down means the elevator is slowing down.)
102
What is the force the bottom spring exerts on the bottom mass?
N
5)
What is the distance the upper spring is extended from its unstretched length?128.6
cm
8)
What is the distance the MIDDLE spring is extended from its unstretched length? LOOKING FOR ANSWER TO #8
1) A single mass m1 = 3.4 kg hangs from a spring in a motionless elevator. The spring is extended x = 14 cm from its unstretched length.We have to calculate the spring constant of the spring.The spring constant of the spring is given by the equation below:k = (m*g) / xwhere,m = mass of the object, m1 = 3.4 kgx = displacement = 14 cm = 0.14 m g = 9.8 m/s², acceleration due to gravitySubstitute the given values in the above equation to get;k = (m*g) / xk = (3.4 kg * 9.8 m/s²) / (0.14 m)k = 238 N/m2) Now, three masses m1 = 3.4 kg, m2 = 10.2 kg and m3 = 6.8 kg hang from three identical springs in a motionless elevator. The springs all have the same spring constant that you just calculated above.
We have to calculate the force the top spring exerts on the top mass.The force the top spring exerts on the top mass is given by the equation below;F1 = k * x1where,F1 = force exerted by the top spring on the top mass, k = spring constant = 238 N/mx1 = displacement of the top spring = 14 cm = 0.14 mSubstitute the given values in the above equation to get;F1 = k * x1F1 = 238 N/m * 0.14 mF1 = 33.32 N3) We have to calculate the distance the lower spring is stretched from its equilibrium length.The displacement of the lower spring can be found using the equation for force exerted by a spring;F2 = k * x2where, F2 = force exerted by the middle spring, k = spring constant = 238 N/mx2 = displacement of the middle spring from the equilibrium length.
The force exerted by the middle spring is equal to the sum of the weights of the middle and the lower blocks since they are connected by the same spring. Thus,F2 = (m2 + m3) * gSubstituting the given values in the above equation,m2 = 10.2 kgm3 = 6.8 kgg = 9.8 m/s²F2 = (10.2 kg + 6.8 kg) * 9.8 m/s²F2 = 147.56 NThus,F2 = k * x2Therefore, x2 = F2 / k = 147.56 N / 238 N/m = 0.62 m = 62 cm.4) We have to calculate the force the bottom spring exerts on the bottom mass.The force the bottom spring exerts on the bottom mass is given by the equation below;F3 = m3 * (g - a)where,F3 = force exerted by the bottom spring, m3 = 6.8 kg g = 9.8 m/s², acceleration due to gravitya = 5.3 m/s², acceleration of the elevator in upward direction.
Substituting the given values in the above equation,F3 = m3 * (g - a)F3 = 6.8 kg * (9.8 m/s² - 5.3 m/s²)F3 = 29.96 N5) We have to calculate the distance the upper spring is extended from its unstretched length.The force exerted by the upper spring is equal to the sum of the weights of all the three blocks since they are connected by the same spring. Thus,F = (m1 + m2 + m3) * gSubstituting the given values in the above equation,m1 = 3.4 kgm2 = 10.2 kgm3 = 6.8 kgg = 9.8 m/s²F = (3.4 kg + 10.2 kg + 6.8 kg) * 9.8 m/s²F = 981.6 N
The displacement of the upper spring can be found using the equation for force exerted by a spring;F = k * xwhere,F = 981.6 Nk = spring constant = 238 N/mx = displacement of the upper spring from the equilibrium length.Substituting the given values in the above equation,x = F / k = 981.6 N / 238 N/m = 4.12 m = 412 cm.8) We have to calculate the distance the MIDDLE spring is extended from its unstretched length.The force exerted by the middle spring is equal to the sum of the weights of the middle and the lower blocks since they are connected by the same spring.
Thus,F = (m2 + m3) * gSubstituting the given values in the above equation,m2 = 10.2 kgm3 = 6.8 kgg = 9.8 m/s²F = (10.2 kg + 6.8 kg) * 9.8 m/s²F = 147.56 NThe displacement of the middle spring can be found using the equation for force exerted by a spring;F = k * xwhere,F = 147.56 Nk = spring constant = 238 N/mx = displacement of the middle spring from the equilibrium length.Substituting the given values in the above equation,x = F / k = 147.56 N / 238 N/m = 0.62 m = 62 cm.
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A 97 kg person receives a whole-body radiation dose of 1.9 x 10⁻⁴Gy, delivered by alpha particles for which the RBE factor is 13. Calculate (a) the absorbed energy and the dose equivalent in (b) sieverts and (c) rem.
(a) Number ____________ Units ____________
(b) Number ____________ Units ____________
(c) Number ____________ Units ____________
(a) The number of absorbed energy is calculated to be 0.24033 J. The units for absorbed energy are joules (J). (b) The dose equivalent is calculated to be 0.00247 Sv. The units for dose equivalent are sieverts (Sv). (c) The dose equivalent in rem is 0.247 rem. The units for dose equivalent in rem is rem.
(a) The absorbed energy can be calculated by multiplying the absorbed dose, RBE factor, and mass of the person. In this case, the absorbed energy is found to be 0.24033 J.
(b) The dose equivalent is obtained by multiplying the absorbed dose and the quality factor. For alpha radiation, the quality factor is 13. Thus, the dose equivalent is calculated as 0.00247 Sv.
(c) The dose equivalent in rem is derived by converting Sv to rem. To convert, the dose equivalent in Sv is multiplied by 100. Therefore, the dose equivalent in rem is found to be 0.247 rem.
In summary, the absorbed energy is 0.24033 J, the dose equivalent is 0.00247 Sv, and the dose equivalent in rem is 0.247 rem.
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Which pairs of angles must atways be the same? Select one: a. Angle of incidence and angle of reflection b. Angle of incidence and angle of refraction c. Angle of reflection and angle of refraction d. Angle of incidence and angle of diffraction Two waves cross and result in a wave with a targer amplitude than either of the originat waves, This is called Select one: a. phase exchange b. negative superimposition c. destructive interference d. constructive interference
The angles that must always be the same are the angle of incidence and the angle of reflection (a). When two waves cross and result in a wave with a larger amplitude than either of the original waves, it is called constructive interference (d).
(a) The angle of incidence and the angle of reflection must always be the same. According to the law of reflection, when a wave reflects off a surface, the angle at which it strikes the surface (angle of incidence) is equal to the angle at which it bounces off (angle of reflection). This holds true for all types of surfaces, whether they are smooth or rough.
(d) When two waves cross and their amplitudes add up to create a wave with a larger amplitude than either of the original waves, it is called constructive interference. In constructive interference, the crests of one wave align with the crests of the other wave, resulting in reinforcement and an increase in amplitude. This occurs when the waves are in phase, meaning their peaks and troughs align.
Therefore, the correct answer is: Angle of incidence and angle of reflection must always be the same (a), and when two waves cross and result in a wave with a larger amplitude, it is called constructive interference (d).
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Question 5 (2 points) Listen Which of the following best describes the image produced by a flat mirror? real, inverted, and magnification less than one virtual, inverted, and magnification greater than one virtual, upright, and magnification equal to one real, upright, and magnification equal to one
The best description of the image produced by a flat mirror is: virtual, upright, and magnification equal to one. In the case of a flat mirror, the image formed is virtual, which means it cannot be projected onto a screen.
Instead, the image is formed by the apparent intersection of the reflected rays. This virtual image is always located behind the mirror, at the same distance as the object, and it cannot be physically captured or projected.
Furthermore, the image formed by a flat mirror is upright, meaning it has the same orientation as the object. If you raise your right hand in front of a flat mirror, the image in the mirror will also show a raised right hand. The mirror preserves the direction of the light rays, resulting in an upright image.
Lastly, the magnification of a flat mirror is equal to one. Magnification refers to the ratio of the height of the image to the height of the object. Since the image formed by a flat mirror is the same size as the object, the magnification is equal to one.
To summarize, a flat mirror produces a virtual, upright image with a magnification equal to one. It reflects the light rays without altering their orientation or size, allowing us to see ourselves and objects with a preserved reflection.
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At speeds approaching C, the relativistic momentum must be used to calculate the deBroglie wavelength. (a) Calculate the wavelength of a relativistic electron moving at 0.960c. (b) In order to probe the internal structure of the nucleus, electrons having a wavelength similar to the size of the nucleus can be used. In GeV, what is the kinetic energy of an electron with a wavelength of 1.0 fm, or 1.0 x 10⁻¹⁵ m?
The wavelength at relativistic speeds is 3.29 x 10^-12 m and the kinetic energy of an electron with a wavelength of 1.0 fm is 8.66 GeV.
(a) The formula for de Broglie wavelength is:
λ = h/p
where λ is wavelength, h is Planck's constant, and p is momentum. The formula for momentum is p = mv, where m is mass and v is velocity. At speeds approaching C, the relativistic momentum must be used, which is given by the formula p = γmv where γ is the Lorentz factor. Therefore, the formula for de Broglie wavelength at relativistic speeds is:
λ = h/γmv
v = 0.960c = 0.960 x 3 x 10^8 m/s
m = 9.11 x 10^-31 kg (mass of an electron)
h = 6.626 x 10^-34 J·s (Planck's constant)
γ = 1/√(1-v²/c²) = 1/√(1-0.960²) = 2.92 (Lorentz factor)
Substituting into the formula:
λ = (6.626 x 10^-34)/(2.92 x 9.11 x 10^-31 x 0.960 x 3 x 10^8)
λ = 3.29 x 10^-12 m
(b) The formula for de Broglie wavelength is:
λ = h/p
where λ is wavelength, h is Planck's constant, and p is momentum. The formula for momentum is p = mv, where m is mass and v is velocity. The kinetic energy can be found using the formula:
KE = (γ - 1)mc²
λ = 1.0 x 10^-15 m (size of the nucleus)
h = 6.626 x 10^-34 J·s (Planck's constant)
m = 9.11 x 10^-31 kg (mass of an electron)
c = 3 x 10^8 m/s (speed of light)
λ = h/p ⇒ p = h/λ
Substituting into the formula:
p = h/λ = (6.626 x 10^-34)/(1.0 x 10^-15)
p = 6.626 x 10^-19 kg·m/s
Kinetic energy:
KE = (γ - 1)mc²
Given the wavelength λ = 1.0 fm = 1.0 x 10^-15 m
We can calculate momentum p = h/λ = 6.626 x 10^-19 kg·m/s.
Substituting into the formula:
KE = (γ - 1)mc²
where m = 9.11 x 10^-31 kg and c = 3 x 10^8 m/s
KE = [(1/√(1-v²/c²)) - 1]mc²
Solving for v gives:
v = c√[1 - (mc²/KE + mc²)²]
Substituting the values:
mc² = 0.511 MeV (rest energy of an electron)
KE = hc/λ = (6.626 x 10^-34 x 3 x 10^8)/(1.0 x 10^-15) = 1.989 x 10^3 MeV
c = 3 x 10^8 m/s
The formula now becomes:
v = c√[1 - (mc²/KE + mc²)²] = 0.999999996c (approx)
γ = 1/√(1-v²/c²) = 5.24
Substituting into the formula:
KE = (γ - 1)mc² = 8.66 x 10^3 MeV = 8.66 GeV
Thus, the kinetic energy of an electron with a wavelength of 1.0 fm is 8.66 GeV.
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A laser emits radiations with a wavelength of λ=470 nm. How many photons are emitted per second if the laser has a power of 1.5 mW?
The number of photons emitted per second is 7.4 × 10^14 photons/second when a laser emits radiations with a wavelength of λ = 470 nm and has a power of 1.5 mW.
The given values are:Power, P = 1.5 mWavelength, λ = 470 nmWe can use the formula to find the number of photons emitted per second.N = P / (E * λ)Where,N is the number of photons emitted per secondP is the power of the laserE is the energy of each photonλ is the wavelength of the lightE = hc / λ.
Where,h is the Planck's constant (6.626 × 10^-34 J s)c is the speed of light (3 × 10^8 m/s)Putting the given values in E = hc / λWe get,E = (6.626 × 10^-34) × (3 × 10^8) / (470 × 10^-9)E = 4.224 × 10^-19 JNow, putting the values of P, E, and λ in the above equation:N = P / (E * λ)N = (1.5 × 10^-3) / (4.224 × 10^-19 × 470 × 10^-9)N = 7.4 × 10^14 photons/second.
Therefore, the number of photons emitted per second is 7.4 × 10^14 photons/second when a laser emits radiations with a wavelength of λ = 470 nm and has a power of 1.5 mW.
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A charge, its electric field and its electric flux can propagate through this medium... conductors semi-conductors a planar mirror insulators A charge, its electric field nor its electric flux cannot propagate through in this medium... conductor sacrificial anode insulator water
A charge, its electric field, and its electric flux can propagate through conductors, semiconductors, and insulators. However, they cannot propagate through planar mirrors.
Conductors, such as metals, allow the free movement of electrons, which allows charges to flow through them. The electric field generated by a charge can extend through the conductor, influencing nearby charges. Similarly, the electric flux, which represents the flow of electric field lines through a surface, can propagate through conductors.
Semiconductors, like silicon, have properties between conductors and insulators. They can carry charges to some extent, although not as effectively as conductors. Charges can create an electric field within a semiconductor and the electric flux can propagate through it, although with some limitations.
Insulators, such as rubber or plastic, do not allow the free movement of electrons. However, charges can still create an electric field within an insulator, and the electric flux can propagate through it. Insulators have high resistance to the flow of charges.
In contrast, planar mirrors do not allow the propagation of charges, electric fields, or electric flux. They are made of materials that reflect light but do not conduct electricity. Therefore, charges cannot move through planar mirrors, and their associated electric fields and electric flux cannot propagate through them.
It's worth noting that a conductor sacrificial anode, like other conductors, allows the propagation of charges, electric fields, and electric flux, as it conducts electricity. Water, on the other hand, is a poor conductor of electricity, but charges can still propagate through it to some extent due to the presence of ions, making it a weak conductor.
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If a Saturn V rocket with an Apollo spacecraft attached had a combined mass of 3.3 x 10⁵ kg and reached a speed of 11 km/s, how much kinetic energy would it then have? Number ___________ Units _____________
The kinetic energy of the Saturn V rocket with an Apollo spacecraft attached would be 2.2555 x 10¹³ joules (J).
The kinetic energy (KE) of an object with mass m traveling at velocity v is given by the equation KE = (1/2) mv².
Therefore, to calculate the kinetic energy of a Saturn V rocket with an Apollo spacecraft attached, which had a combined mass of 3.3 x 10⁵ kg and reached a speed of 11 km/s, we need to plug in these values into the equation:
KE = (1/2) mv²
Where: m = 3.3 x 10⁵ kg (mass of Saturn V rocket with an Apollo spacecraft attached) v = 11 km/s (speed)
We need to convert the speed to meters per second (m/s) to ensure that our units are in SI units:
1 km/s = 1000 m/s.
Therefore, v = 11 km/s x 1000 m/km = 11000 m/s.
Substituting these values into the equation, we get:
KE = (1/2) x 3.3 x 10⁵ kg x (11000 m/s)²= (1/2) x 3.3 x 10⁵ kg x 121000000 m²/s²= 2.2555 x 10¹³ J
Therefore, the kinetic energy of the Saturn V rocket with an Apollo spacecraft attached would be 2.2555 x 10¹³ joules (J).
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A cord is used to vertically lower an initially stationary block of mass M-12 kg at a constant downward acceleration of g/5. When the block has fallen a distance d = 3.9 m, find (a) the work done by the cord's force on the block. (b) the work done by the gravitational force on the block, (c) the kinetic energy of the block, and (d) the speed of the block. (Note: Take the downward direction positive) (a) Number ______________ Units ________________
(b) Number ______________ Units ________________
(c) Number ______________ Units ________________
(d) Number ______________ Units ________________
A cord is used to vertically lower an initially stationary block of mass M-12 kg at a constant downward acceleration of g/5
Mass of the block, M = 12 kg
When the block has fallen a distance d = 3.9 m, acceleration of the block, a = g/5 = 9.8/5 m/s² = 1.96 m/s²
We know that work done is given by W = Fs
Here, downward acceleration, a = 1.96 m/s²
Gravitational force acting on the block = Mg = 12 × 9.8 = 117.6 N (taking downward direction positive)
(a) The work done by the cord's force on the block
F = Ma = 12 × 1.96 = 23.52 NW = Fs = 23.52 × 3.9 = 91.728 J
(b) The work done by the gravitational force on the block
W = F × d = 117.6 × 3.9 = 459.84 J
(c) The kinetic energy of the block
When the block falls a distance d, the potential energy is converted into kinetic energy.
In other words, Potential Energy + Work done = Kinetic Energy (mv²)/2mgd + Fd = (mv²)/2v² = 2gd + (2Fd)/mv² = 2 × 9.8 × 3.9 + (2 × 117.6 × 3.9)/12v² = 76.44v = √76.44m/s
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A seated musician plays an A*5 note at 932 Hz. How much time At does it take for 796 air pressure maxima to pass a stationary listener? Δt = ______ s You would like to express the air pressure oscillations at a point in space in the given form. a P(t) = Pmaxcos (Bt) If t is measured in seconds, what value should the quantity B have? B=_____
If t is measured in seconds, what units should the quantity B have?
The quantity B in the expression for air pressure oscillations 5866.25 rad/s. The units of B are radians per second (rad/s), regardless of the unit chosen for measuring time.
To find the time it takes for 796 air pressure maxima to pass a stationary listener, we need to determine the time period of the wave. The time period (T) of a wave is defined as the inverse of its frequency (f).
Given that the musician plays an A*5 note at 932 Hz, we have:
f = 932 Hz
Using the formula for the time period (T = 1/f), we find:
T = 1/932 s
Now, to calculate the time (Δt) for 796 maxima to pass, we multiply the time period by the number of maxima:
Δt = T * 796
Substituting the value of T, we get:
Δt = (1/932 s) * 796 = 0.854 s
Therefore, the value for Δt, the time it takes for 796 air pressure maxima to pass a stationary listener, is approximately 0.854 s.
Regarding the quantity B in the expression for air pressure oscillations, P(t) = Pmaxcos(Bt), the formula for B is:
B = 2πf
Substituting the value of f, we have:
B = 2π * 932 rad/s
Thus, the value of B is approximately 5866.25 rad/s.
The units of B are radians per second (rad/s), regardless of the unit chosen for measuring time.
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. Sunlight falls on a soap film 360 nm thick. The soap film has an index of 1.25 and lies on top of water of index 1.33. Find (a) the wavelength of visible light most strongly reflected, and (b) the wavelength of visible light that is not seen to reflect at all. Estimate the colors.
(a) The wavelength of visible light most strongly reflected is 720 nm. This corresponds to the color red in the visible spectrum.(b) The soap film will strongly reflect red light (720 nm) and not reflect violet light (240 nm), giving rise to the colors observed in thin film interference.
The wavelength of visible light most strongly reflected and the wavelength of visible light that is not seen to reflect at all, we can use the principles of thin film interference.
(a) The wavelength of visible light most strongly reflected can be determined using the equation for constructive interference in a thin film:
2t = mλ
where t is the thickness of the film, λ is the wavelength of light, and m is the order of the interference. In this case, we are looking for the first-order interference (m = 1).
t = 360 nm = 360 x 10^-9 m
n1 (index of soap film) = 1.25
n2 (index of water) = 1.33
We can rearrange the equation to solve for λ:
λ = 2t / m
For m = 1:
λ = 2(360 x 10^-9 m) / 1
= 720 x 10^-9 m
= 720 nm
So, the wavelength of visible light most strongly reflected is 720 nm. This corresponds to the color red in the visible spectrum.
(b) The wavelength of visible light that is not seen to reflect at all corresponds to the wavelength of light that experiences destructive interference. In this case, we can use the equation:
2t = (m + 1/2)λ
Using the same values as before, we can solve for λ:
λ = 2t / (m + 1/2)
For m = 1:
λ = 2(360 x 10^-9 m) / (1 + 1/2)
= 2(360 x 10^-9 m) / (3/2)
= (2/3)(360 x 10^-9 m)
= 240 x 10^-9 m
= 240 nm
So, the wavelength of visible light that is not seen to reflect at all is 240 nm. This corresponds to the color violet in the visible spectrum.
Therefore, the soap film will strongly reflect red light (720 nm) and not reflect violet light (240 nm), giving rise to the colors observed in thin film interference.
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The Twisti In The Wring (The Nolks Slides To The Right In The Diagram Below.)
Always wear gloves and eye protection when handling wire ropes. In conclusion, the Twisti in the wring technique is a very effective method for unraveling the twisted ropes. It is easy to use and requires minimal effort.
Twisti in the wring refers to the act of unraveling the twisted ropes. The Nolks Slides to the Right in the Diagram Below is a type of the Twisti in the wring technique. In this technique, we use two strands of wire ropes to form the twist.
The twist can be easily undone by simply sliding the nolks or the kinks in the ropes. This technique is commonly used in the shipping industry to unravel the twisted ropes.However, before you start unraveling the ropes, you need to check the strength and the tensile strength of the wire ropes. The strength of the wire ropes depends on the size, grade, and construction of the wire ropes.
The tensile strength of the wire ropes is measured in pounds per square inch (psi).The Twisti in the wring technique is a very effective method for unraveling the twisted ropes. It is easy to use and requires minimal effort. The technique is commonly used in the shipping industry to unravel the twisted ropes. It is important to follow proper safety precautions when using this technique.
Always wear gloves and eye protection when handling wire ropes. In conclusion, the Twisti in the wring technique is a very effective method for unraveling the twisted ropes. It is easy to use and requires minimal effort.
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A(n) ultraviolet photon has a wavelength of 0.00900 cm. Find the momentum, the frequency, and the energy of the photon in electron volts. (a) the momentum kg · m/s (b) the frequency Hz (c) the energy of the photon in electron volts eV Need Help? Read It
A(n) ultraviolet photon has a wavelength of 0.00900 cm.(a)Frequency ≈ 3.33 x 10^12 Hz.(b)Energy ≈ 1.366 eV.(c) Energy of the photon: 1.366 eV
To find the momentum of a photon, we can use the formula:
Momentum = (Planck's constant) / (wavelength)
The Planck's constant, denoted as h, is approximately 6.626 x 10^-34 J·s.
Given the wavelength of the ultraviolet photon as 0.00900 cm (or 0.0000900 m), we have:
Momentum = (6.626 x 10^-34 J·s) / (0.0000900 m)
Momentum ≈ 7.362 x 10^-30 kg·m/s
(a) Momentum: 7.362 x 10^-30 kg·m/s
To find the frequency of the photon, we can use the formula:
Frequency = (speed of light) / (wavelength)
The speed of light, denoted as c, is approximately 3.00 x 10^8 m/s.
Using the wavelength of the photon as 0.00900 cm (or 0.0000900 m), we have:
Frequency = (3.00 x 10^8 m/s) / (0.0000900 m)
Frequency ≈ 3.33 x 10^12 Hz
(b) Frequency: 3.33 x 10^12 Hz
To find the energy of the photon in electron volts (eV), we can use the formula:
Energy = (Planck's constant) ×(frequency) / (electron charge)
The electron charge, denoted as e, is approximately 1.602 x 10^-19 C.
Substituting the values, we have:
Energy = (6.626 x 10^-34 J·s)× (3.33 x 10^12 Hz) / (1.602 x 10^-19 C)
Energy ≈ 1.366 eV
(c) Energy of the photon: 1.366 eV
Note: 1 electron volt (eV) is defined as the energy gained or lost by an electron when it moves through a potential difference of 1 volt.
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Calculate the heat flux into the subsurface, the nel radiation emited is 88 sensible heat flux to the air is 3, no energy trapped during photosynthesis, heat aborted by vegetation is 14 and latent heat flux 4 Report the answer as a whole number with zero decimal place Scientific exponential notation is not allowed eg 10-4 • Spaces are not allowed Calculate the heat flux into the subsurface, the nel radiation emited is 88 sensible heat flux to the air is 3, no energy trapped during photosynthesis, heat aborted by vegetation is 14 and latent heat flux 4 Report the answer as a whole number with zero decimal place Scientific exponential notation is not allowed eg 10-4 • Spaces are not allowed
Answer: the heat flux into the subsurface is 67.
The heat flux into the subsurface can be calculated using the following formula; Qsub = Qnet - Qs - Qv - Qh - Qp Where,
Qsub = heat flux into the subsurface,
Qnet = net radiation emitted,
Qs = sensible heat flux to the air,
Qv = latent heat flux,
Qh = heat absorbed by vegetation,
Qp = energy trapped during photosynthesisGiven,
Qnet = 88Qs = 3Qv = 4Qh = 14Qp = 0
Now, substituting the given values into the above equation; Qsub = 88 - 3 - 4 - 14 - 0= 67
Hence, the heat flux into the subsurface is 67. Answer: 67
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An electrical circuit contains a capacitor of Z picofarads and a resistor of X ohms. If the x=1503 capacitor is fully charged, and then the voltage is interrupted, in how much time will about 95%Z=15.03 m of its charge be transferred to the resistor? Show your calculations.
The time taken to transfer about 95% of the charge to the resistor is 65.4 s (approx)
The given values in the problem are:X = 1503 ΩZ = 15.03 mF
The time taken to transfer about 95% of its charge to the resistor can be determined using the time constant (τ) of the circuit. The time constant (τ) of the circuit is given by the formula; τ = RC
where R is the resistance of the circuit in ohms and C is the capacitance of the circuit in farads.τ = RC = (1503 Ω)(15.03 × 10⁻³ F) = 22.56849 s ≈ 22.6 s (approx)
After one time constant, the charge on the capacitor is reduced to about 36.8% of its initial charge.
Hence, to transfer about 95% of its charge to the resistor, we need to wait for about 2.9 time constants (95 ÷ 36.8 ≈ 2.9).
The time taken to transfer about 95% of the charge to the resistor is;T = 2.9τ = 2.9 × 22.56849 s = 65.43861 s ≈ 65.4 s (approx)
Therefore, the time taken to transfer about 95% of the charge to the resistor is 65.4 s (approx)
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(2 M) A balanced Y-connected load with a phase impedance of 40+ j25 2 is supplied by a balanced, positive sequence -connected source with a line voltage of 210 V. Calculate the phase currents. Use Vab as reference.
The phase currents of the balanced Y-connected load are approximately:
Ia = 4.40 ∠ 0° A
Ib = 4.40 ∠ (-120°) A
Ic = 4.40 ∠ 120° A
To calculate the phase currents of the balanced Y-connected load, we can use the concept of complex power and impedance.
Given:
Phase impedance of the load (Z) = 40 + j25 Ω
Line voltage (Vab) = 210 V
In a Y-connected system, the line voltage (Vab) is equal to the phase voltage (Vp). So, we can directly use the line voltage as the reference for calculations.
The complex power (S) is given by:
S = V * I*
Where:
V is the complex conjugate of the voltage
I is the complex current
To find the phase current (I), we can rearrange the equation as:
I = S / V
Now, let's calculate the phase current.
Step 1: Convert the line voltage (Vab) to the phase voltage (Vp)
Since in a Y-connected system, Vp = Vab, the phase voltage is also 210 V.
Step 2: Calculate the complex power (S)
S = V * I* = Vp * I*
Step 3: Calculate the magnitude of the current (|I|)
|I| = |S| / |Vp|
Step 4: Calculate the phase angle of the current (θI)
θI = arg(S) - arg(Vp)
Given that the phase impedance of the load is 40 + j25 Ω, we can calculate the current as follows:
|I| = |S| / |Vp| = |Vp| / |Z|
θI = arg(S) - arg(Vp) = arg(Z)
Now, let's calculate the phase current.
|I| = |Vp| / |Z| = 210 V / |40 + j25 Ω| = 210 V / √(40^2 + 25^2) ≈ 210 V / 47.69 Ω ≈ 4.40 A
θI = arg(Z) = arctan(25/40) ≈ 33.69°
Therefore, the phase currents of the balanced Y-connected load are approximately:
Ia = 4.40 ∠ 0° A
Ib = 4.40 ∠ (-120°) A
Ic = 4.40 ∠ 120° A
Note: The angles represent the phase angles of the currents with respect to the reference voltage Vab.
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Prove the effective thickness equation.
To prove the effective thickness equation, we need to start with the basic equation for thermal resistance in a composite wall. The thermal resistance of a composite wall can be expressed as:
1/[tex]R_{total[/tex] = Σ[tex](L_i / k_i)[/tex],
where [tex]R_{total[/tex] is the total thermal resistance, [tex]L_i[/tex] is the thickness of each layer i, and [tex]k_i[/tex] is the thermal conductivity of each layer i.
Now, let's consider a composite wall consisting of multiple layers with varying thicknesses. The effective thickness ([tex]L_{eff[/tex]) is defined as the thickness of a single imaginary layer that would have the same thermal resistance as the composite wall. We want to derive an equation for [tex]L_{eff[/tex].
To begin, we can rewrite the thermal resistance equation for the composite wall as:
1/[tex]R_{total[/tex] = ([tex]L_1 / k_1) + (L_2 / k_2) + ... + (L_n / k_n)[/tex],
where n is the total number of layers in the composite wall.
Now, we introduce the concept of effective thermal conductivity ([tex]k_{eff)[/tex], which is the thermal conductivity that the composite wall would have if it were replaced by a single imaginary layer with thickness [tex]L_{eff[/tex]. We can express this as:
[tex]k_{eff[/tex] = Σ[tex](L_i / k_i[/tex]).
The effective thermal conductivity represents the ratio of the total thickness of the composite wall to the total thermal resistance.
Next, we can rearrange the equation for the effective thermal conductivity to solve for[tex]L_{eff[/tex]:
[tex]k_{eff = L_{eff / R_{total.[/tex]
Now, we can substitute the expression for the total thermal resistance ([tex]R_{total[/tex]) from the thermal resistance equation:
[tex]k_{eff = L_{eff / ((L_1 / k_1) + (L_2 / k_2) + ... + (L_n / k_n)[/tex]).
Finally, by rearranging the equation, we can solve for [tex]L_{eff[/tex]:
[tex]L_eff = k_eff / ((1 / L_1) + (1 / L_2) + ... + (1 / L_n)).[/tex]
This is the effective thickness equation, which gives the thickness of a single imaginary layer that would have the same thermal resistance as the composite wall.
The effective thickness equation allows us to simplify the analysis of composite walls by replacing them with a single equivalent layer. This concept is particularly useful when dealing with heat transfer calculations in complex systems with multiple layers and varying thicknesses, as it simplifies the calculations and reduces the system to an equivalent homogeneous layer.
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