a. Polarization is caused by the scattering of sunlight off air molecules in the Earth's atmosphere.
b. when you examine the blue sky light with a Polaroid filter, the direction of the electric field is North-South.
a. The electric fields of electromagnetic waves are caused by the vibration of charged particles. A polarized filter is able to block one direction of polarization while allowing the other direction to pass through. This happens because a polarizing filter is made up of a long chain of molecules oriented in one direction, which blocks light waves with electric fields oriented in a perpendicular direction.
The polarization of sunlight is due to the scattering of light off air molecules. This scattering causes light waves with electric fields oriented in a perpendicular direction to the Sun to be polarized. The electric fields of light waves in the blue part of the spectrum are oriented in a north-south direction, while the electric fields of light waves in the red part of the spectrum are oriented in an east-west direction.
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How many watts does a flashlight that has 6.4 x 10²C pass through it in 0.492 h use if its voltage is 3 V? __________ W
The power consumed by the flashlight is 10.92 W.
watt = volt x coulombs/sec
where:
watt = power
volt = voltage
coulombs/sec = charge/time
Put the given values in the formula, we get:
watt = 3 V × (6.4 × 10² C/0.492 h)
watt = 3 V × (6.4 × 10² C/1769.2 s)
watt = 10.92 W
Therefore, the power consumed by the flashlight is 10.92 W.
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An object with mass 0.360-kg, attached to a spring with spring constant k = 10.0 N/m, is moving on a horizontal frictionless surface in simple harmonic motion of amplitude A = 0.0820 m. What is the kinetic energy of the object at the instant when its displacement is x = 0.0410 m? a. 0.042 J
b. 2.46 J
c. 0.025 J
d. 9.86 J
e. 0.013 J
The kinetic energy of the object at the instant when its displacement is x = 0.0410 m is 0.024 J. The option (c) 0.025 J is the closest.
spring constant k = 10.0 N/m,
amplitude A = 0.0820 m.
We are to find the kinetic energy of the object at the instant when its displacement is x = 0.0410 m.
The kinetic energy (KE) of the object can be given as the difference between its potential energy (PE) and its total mechanical energy (E).
The potential energy stored in the spring when it is stretched or compressed is given as;
PE = 1/2 kx²
Where
k = spring constant
x = displacement
Substitute the given values;
PE = 1/2(10.0 N/m)(0.0410 m)² = 0.00846 J
Total mechanical energy (E) is given as:
E = 1/2 kA²
Where
A = amplitude of motion
Substitute the given values;
E = 1/2(10.0 N/m)(0.0820 m)² = 0.033 Joules
Kinetic energy (KE) is given as:
KE = E - PE= 0.033 J - 0.00846 J= 0.024 J
Therefore, the kinetic energy of the object at the instant when its displacement is
x = 0.0410 m is 0.024 J.
The option (c) 0.025 J is the closest.
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Intelligent beings in a distant galaxy send a signal to earth in the form of an electromagnetic wave. The frequency of the signal observed on earth is 1.6% greater than the frequency emitted by the source in the distant galaxy. What is the speed vrel of of galaxy relative to the earth? Vrel = Number ________________ Units ____________
The speed vrel of the galaxy relative to the Earth is 4.8 x 10^6 m/s
Number = 4.8 x 10^6; Units = m/s.
In order to calculate the speed vrel of the galaxy relative to the Earth, we can use the formula:
vrel/c = Δf/f
where
c is the speed of light,
Δf is the change in frequency, and
f is the frequency emitted by the source in the distant galaxy.
So, first we need to calculate the value of Δf.
We know that the frequency observed on Earth is 1.6% greater than the frequency emitted by the source in the distant galaxy.
Mathematically, we can express this as:
Δf = (1.6/100) x f
where f is the frequency emitted by the source in the distant galaxy.
Substituting this value of Δf in the above formula, we get:
vrel/c = Δf/f
= (1.6/100) x f / f
= 1.6/100
vrel/c = 0.016
vrel = c x 0.016
vrel = 3 x 10^8 m/s x 0.016
= 4.8 x 10^6 m/s
Hence, the speed vrel of the galaxy relative to the Earth is 4.8 x 10^6 m/s (meters per second).
Number = 4.8 x 10^6; Units = m/s.
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The switch opens at t = 0 after a very long time. Find v(t) for t > 0. Draw circuits clearly for each step using 4-step approach to illustrate the situation when t<0 and t>0 when doing circuit analysis for full credit. Write final answers in the box provided. [10 pts] 6 V 30 k 0 47 (1) 60 k 5 μF 60 k
The voltage of switch function v(t) for t > 0 is approximately 5.992 V. The 5 μF capacitor does not affect the voltage at steady-state.
To analyze the circuit and find the voltage function v(t) for t > 0, let's go through the 4-step approach and consider the circuit at t < 0 and t > 0 separately.
Step 1: Circuit at t < 0 (before the switch opens)
At t < 0, the switch is closed, and the capacitor is assumed to have been charged to a steady-state. In this case, the capacitor behaves like an open circuit, and the 60 kΩ resistor is effectively disconnected.
The circuit at t < 0 can be represented as follows:
Step 2: Circuit at t = 0 (when the switch opens)
At t = 0, the switch opens. The capacitor retains its voltage, and the voltage across it remains constant. However, the circuit topology changes as the capacitor now acts as a voltage source with an initial voltage of 6 V.
The circuit at t = 0 can be represented as follows:
Step 3: Circuit at t > 0 (after the switch opens)
At t > 0, the switch remains open, and the circuit reaches a new steady-state. The capacitor acts like an open circuit in the steady-state, and the 60 kΩ resistor is effectively disconnected.
The circuit at t > 0 can be represented as follows:
Step 4: Solving for v(t) for t > 0
To find the voltage function v(t) for t > 0, we can use the voltage divider rule to determine the voltage across the 30 kΩ resistor.
The voltage across the 30 kΩ resistor is given by:
v(t) = (30 kΩ / (30 kΩ + 47 Ω)) * 6 V
Simplifying the equation:
v(t) = (30000 / 30047) * 6 V
v(t) ≈ 5.992 V (approximately)
Therefore, the voltage function v(t) for t > 0 is approximately 5.992 V.
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What is the smallest thickness of a soap bubble (n=1.33) capable of producing reflective constructive 568nm light ray?
The smallest thickness of a soap bubble capable of producing reflective constructive interference for a 568 nm light ray is approximately 213.53 nanometers.
To determine the smallest thickness of a soap bubble that can produce reflective constructive interference for a specific wavelength of light, we can use the equation for constructive interference in a thin film:
2t = mλ/n
where:
t is the thickness of the soap bubble
m is the order of the interference (in this case, m = 1 for first-order)
λ is the wavelength of the light
n is the refractive index of the medium (in this case, the refractive index of the soap bubble, n = 1.33)
Rearranging the equation, we get:
t = (mλ)/(2n)
Plugging in the values, we have:
t = (1 x 568 nm) / (2 x 1.33)
Calculating this, we find:
t ≈ 213.53 nm
Therefore, the smallest thickness of a soap bubble capable of producing reflective constructive interference for a 568 nm light ray is approximately 213.53 nanometers.
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A 87.0 kg person is riding in a car moving at 24.0 m/s when the car runs into a bridge abutment. Calculate the average force on the person if he is stopped by a padded dashboard that compresses an average of 1.00 cm. Calculate the average force on the person if he is stopped by an air bag that compresses an average of 15.0 cm.
The average force exerted on the person if he is stopped by a padded dashboard that compresses an average of 1.00 cm is 5.54 * 10³ N, and the average force exerted on the person if he is stopped by an airbag that compresses an average of 15.0 cm is 2.60 * 10⁴ N.
The impact of a vehicle during an accident can result in serious injury or even death. Therefore, it is necessary to calculate the force exerted on a passenger during an accident. Here are the calculations to determine the average force on the person if he is stopped by a padded dashboard that compresses an average of 1.00 cm and an airbag that compresses an average of 15.0 cm.
Mass of the person, m = 87.0 kg
Velocity of the car, v = 24.0 m/s
Compression distance by the padded dashboard, d1 = 1.00 cm
Compression distance by the airbag, d2 = 15.0 cm
The momentum of a body is given as:
P = m * v
The above equation represents the initial momentum of the passenger in the car before the collision. Now, after the collision, the passenger comes to rest, and the entire momentum of the passenger is absorbed by the padded dashboard and the airbag. Therefore, the force exerted on the passenger during the collision is:
F = Δp / Δt
Here, Δt is the time taken by the dashboard and the airbag to come to rest. Therefore, it is assumed that the time is the same for both cases. Therefore, we can calculate the average force exerted on the person by the dashboard and the airbag as follows:
Average force exerted by the dashboard,
F1 = Δp / Δt1 = m * v / t1
The distance over which the dashboard is compressed is d1 = 1.00 cm = 0.01 m. Therefore, the time taken by the dashboard to come to rest is:
t1 = √(2 * d1 / a)
Here, a is the acceleration of the dashboard, which is given as a = F1 / m.The above equation can be written as:F1 = m * a = m * (√(2 * d1 / t1²))
Therefore, the average force exerted by the dashboard can be calculated as:
F1 = m * (√(2 * d1 * a)) / t1 = 5.54 * 10³ N
Average force exerted by the airbag,
F2 = Δp / Δt2 = m * v / t2
The distance over which the airbag is compressed is d2 = 15.0 cm = 0.15 m. Therefore, the time taken by the airbag to come to rest is:t2 = √(2 * d2 / a)
Here, a is the acceleration of the airbag, which is given as a = F2 / m.
The above equation can be written as:
F2 = m * a = m * (√(2 * d2 / t2²))
Therefore, the average force exerted by the airbag can be calculated as:
F2 = m * (√(2 * d2 * a)) / t2 = 2.60 * 10⁴ N
Therefore, the average force exerted on the person if he is stopped by a padded dashboard that compresses an average of 1.00 cm is 5.54 * 10³ N, and the average force exerted on the person if he is stopped by an airbag that compresses an average of 15.0 cm is 2.60 * 10⁴ N.
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Maxwell's Equation
A circular-plates capacitor of radius R = 22.0 cm is connected to a source of
emf E= Emsinωt, where Em = 237V and ω = 180rad/s. The maximum value
of the displacement current is id = 4.5μA.
(a) Find the maximum value of the current i in the circuit.
(b) Find the maximum value of dφE /dt, where φE is the electric flux through the
region between the plates.
(c) Find the separation d between the plates.
(d) Find the maximum value of the magnitude of ~B between the plates at a distance
r = 10.7 cm from the center.
A circular-plates capacitor with a radius of 22.0 cm is connected to a sinusoidal voltage source E = Emsin(ωt). The maximum current i is 4.5 μA. he maximum value of dφ [tex]\frac{E}{dt}[/tex] is 237 V * ω. Magnitude can be obtained using ampere's law.
(a) The maximum value of the current, i, can be determined by equating the displacement current, id, to the rate of change of electric flux, dφ [tex]\frac{E}{dt}[/tex], in the circuit. Since id is given as 4.5 μA, the maximum value of i is also 4.5 μA.
(b) The maximum value of dφ [tex]\frac{E}{dt}[/tex] can be calculated by taking the time derivative of the given emf expression E = Em sin(ωt). The derivative of sin(ωt) is ω cos(ωt). Multiplying this by the maximum value of Em (237 V), we get the maximum value of dφ [tex]\frac{E}{dt}[/tex] as 237 V * ω.
(c) The separation between the plates, d, can be found by rearranging the equation for capacitance, C = ε0 * [tex]\frac{A}{d}[/tex], where ε0 is the permittivity of free space and A is the area of the circular plates (π[tex]R^2[/tex]). Substituting the given values of R (22.0 cm) and the known value of C (from the problem), we can solve for d. d = ε0 * (π * R^2) / C.
(d) To find the maximum value of the magnitude of ~B at a distance r = 10.7 cm from the center, we can use Ampere's law in integral form, ∮ B · dl = μ0 * I_enc, where I_enc is the enclosed current. For a circular plate capacitor, the enclosed current is equal to the displacement current, id. By substituting the given value of id and the known values of μ0 and the circumference of the circular path (2πr), we can calculate the maximum value of ~B. Substituting these values into Ampere's law, we have:
B * (2πr) = μ0 * id
We can rearrange this equation to solve for B:
B = (μ0 * id) / (2πr)
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A cannon ball is launched into the ocean at an angle of 30° above the horizon. The cannonball has an initial speed of 46 m/s. The deck the cannonball is fired from is 11 meters high assume this is the initial height of the cannonball). a.) How long does the cannon ball take to reach the ocean? b.) What is the speed of the cannonball just before it lands in the ocean?
The speed of the cannon ball just before it lands in the ocean is given bythe resultant of the horizontal and vertical componentsv = √(vx² + vf²) = √(23 (√3)² + 32.32²)= √(1588.08) = 39.85 m/sHence, the speed of the cannon ball just before it lands in the ocean is 39.85 m/s.
a.) Time taken by the cannon ball to reach the ocean:The initial velocity of the cannon ball, u = 46 m/sThe angle made by the cannon ball with the horizontal, θ = 30°The vertical component of the initial velocity, v = u × sin θ = 46 × sin 30°= 46/2 = 23 m/sLet the time taken by the cannon ball to reach the ocean be t seconds.The distance covered by the cannon ball in the vertical direction in time t is given byh = ut + 1/2gt²where, g = acceleration due to gravity = 9.8 m/s²Substituting the values,11 = (23)t - 1/2 × 9.8 × t²11 = 23t - 4.9t²On solving this equation, we get two values of t, t = 0.947 seconds or t = 4.795 secondsThe time taken by the cannon ball to reach the ocean is 0.947 seconds.
b.) The speed of the cannonball just before it lands in the ocean:The horizontal component of the initial velocity of the cannon ball,vx = u × cos θ = 46 × cos 30°= 46(√3)/2 = 23 (√3) m/sThe time taken by the cannon ball to reach the ocean, t = 0.947 secondsThe horizontal distance covered by the cannon ball in time t is given byx = vx × t = 23 (√3) × 0.947 = 21.04 mThe vertical component of the final velocity of the cannon ball just before it lands in the ocean,vf = u + gt = 23 + 9.8 × 0.947 = 32.32 m/s
The speed of the cannon ball just before it lands in the ocean is given bythe resultant of the horizontal and vertical componentsv = √(vx² + vf²) = √(23 (√3)² + 32.32²)= √(1588.08) = 39.85 m/sHence, the speed of the cannon ball just before it lands in the ocean is 39.85 m/s.
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A parallel beam of monoenergetic photons emerged from a source when the shielding was removed for a short time. The photon energy hv and the total fluence o of photons are known. (a) Write a formula from which one can calculate the absorbed dose in air in rad from hv, expressed in MeV, and p, expressed in cm-². (b) Write a formula for calculating the exposure in R.
(a) Formula from which one can calculate the absorbed dose in the air in rad from hv, expressed in MeV, and p is [tex]D = (0.877 * o * hv) / p[/tex]. (b) the formula for calculating the exposure in R is [tex]X = (0.87 * o *hv)[/tex].
(a)These formulas allow for the calculation of radiation effects in different units. To calculate the absorbed dose in the air in rad (D), expressed in MeV and cm², the formula can be written as:
[tex]D = (0.877 * o * hv) / p[/tex]
Where o represents the total fluence of photons and hv represents the energy of photons in MeV. p is the area in [tex]cm^2[/tex] over which the radiation is spread.
(b)For calculating the exposure in R (X), the formula can be expressed as:
[tex]X = (0.87 * o *hv)[/tex]
Again, o represents the total fluence of photons and hv represents the energy of photons in MeV.
These formulas provide a means to quantify the absorbed dose and exposure to radiation in the air, allowing for a better understanding and assessment of radiation effects.
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A force that varies with time F- 19t3 acts on a sled (to the right, in the positive direction) of mass 60 kg from t₁ = 14 seconds to t₂ -3.5 seconds. If the sled was initially moving TO THE LEFT (in the negative direction) at an initial speed of 29 m/s, determine the final velocity of the sled. Record your answer with at least three significant figures. IF your answer is negative (to the left), be sure to include a negative sign with your answer!
Answer:
The final velocity of the sled is approximately -1688.3 m/s in the negative direction.
Mass of the sled (m) = 60 kg
Force acting on the sled (F) = 19t^3 N,
where t is the time in seconds.
Initial velocity of the sled (v_initial) = -29 m/s
To find the final velocity, we'll integrate the force function over the given time interval and apply the initial condition.
The integral of 19t^3 with respect to t is (19/4)t^4.
Let's denote it as F_integrated.
F_integrated = (19/4)t^4
Now, let's calculate the change in momentum:
Δp = F_integrated(t₂) - F_integrated(t₁)
Substituting the time values:
Δp = (19/4)(t₂^4) - (19/4)(t₁^4)
Δp = (19/4)(-3.5^4) - (19/4)(14^4)
Δp = (19/4)(-150.0625) - (19/4)(38416)
Δp = -7129.8125 - 92428
Δp ≈ -99557.8125 kg·m/s
Using the definition of momentum (p = mv), we can relate the change in momentum to the final velocity:
Δp = m(v_final - v_initial)
-99557.8125 = 60(v_final - (-29))
Simplifying:
-99557.8125 = 60(v_final + 29)
Dividing both sides by 60:
-1659.296875 = v_final + 29
Subtracting 29 from both sides:
v_final = -1688.296875 m/s
Therefore, the final velocity of the sled is approximately -1688.3 m/s in the negative direction.
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The figure shows four particles, each of mass 30.0 g, that form a square with an edge length of d-0.800 m. If d is reduced to 0.200 m, what is the change in the gravitational potential energy of the f
The change in gravitational potential energy of the four particles when d is reduced to 0.200 m is ΔU = (-6.00687 × 10⁻¹²) (1/0.2 - 1/(d-0.8)).
The given figure shows four particles, each of mass 30.0 g, forming a square with an edge length of d-0.800 m. The change in gravitational potential energy of the four particles can be calculated using the formula:ΔU = Uf - Ui where ΔU is the change in gravitational potential energy, Uf is the final gravitational potential energy, and Ui is the initial gravitational potential energy. The initial gravitational potential energy of the four particles can be calculated using the formula: Ui = -G m² / r where G is the gravitational constant, m is the mass of each particle, and r is the initial distance between the particles. Since the particles form a square with an edge length of d-0.800 m, the initial distance between the particles is:r = d - 0.800 m. The final gravitational potential energy of the four particles can be calculated using the same formula with the final distance between the particles:r' = 0.200 mΔU = Uf - Ui= -G m² / r' - (-G m² / r)= -G m² (1/r' - 1/r)Now, substituting the given values,G = 6.6743 × 10⁻¹¹ m³ / kg s²m = 0.03 kr = d - 0.8 mr' = 0.2 kΔU = (-6.6743 × 10⁻¹¹ × 0.03²) (1/0.2 - 1/(d-0.8))= (-6.6743 × 10⁻¹¹ × 0.0009) (1/0.2 - 1/(d-0.8))= (-6.00687 × 10⁻¹²) (1/0.2 - 1/(d-0.8)). The change in gravitational potential energy of the four particles when d is reduced to 0.200 m is ΔU = (-6.00687 × 10⁻¹²) (1/0.2 - 1/(d-0.8)).
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Write a discussion and analysis about. the half-wave rectifier ofg the operation
A half-wave rectifier is an electronic circuit that converts the positive half-cycle or the negative half-cycle of an alternating current signal to a pulsating direct current signal. It allows the current to flow in only one direction by removing half of the signal. A half-wave rectifier is less effective than a full-wave rectifier, which utilizes both the positive and negative halves of the AC signal.
The following is a discussion and analysis of the half-wave rectifier operation.
Discussion-
Half-wave rectifiers are frequently used in DC power supply circuits. The fundamental purpose of rectification is to convert AC to DC. Rectifiers may be used to power a variety of electronic devices, ranging from simple battery-powered gadgets to high-voltage power supplies.
During the positive half-cycle of the input AC signal, the diode is forward-biased, allowing current to flow. The load is consequently supplied with a current flow in one direction only. The diode is reverse-biased during the negative half-cycle of the input AC signal, preventing the current from flowing.
The output voltage is unidirectional and has a pulsating nature as a result of this half-wave rectification. It means that, at the beginning of each half-cycle, the output voltage starts from zero and then grows to a peak value until the half-cycle ends.
Analysis:
A half-wave rectifier's output voltage is not pure DC since it contains a lot of ripples. To reduce ripple, an input filter capacitor can be used to smooth the voltage waveform. The resulting waveform is smoothed out and closer to pure DC. As a result, a half-wave rectifier has the following characteristics:
-The maximum voltage is only half the peak input voltage.
-The DC output voltage is pulsating, with a considerable ripple.
-The efficiency of a half-wave rectifier is around 40-50%.
-The half-wave rectifier has a low cost and simple design.
The half-wave rectifier circuit is simple and requires only a single diode. As a result, it is less expensive and more straightforward than a full-wave rectifier circuit. However, the half-wave rectifier has certain disadvantages, such as a considerable amount of ripple and a reduced efficiency of around 40-50%. As a result, it is frequently used in low-power applications.
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A Zehrs truck loaded with cannonball watermelons stops suddenly to avoid running over the edge of a washed out bridge. The quick stop causes a number of melons to fly off of the truck. One melon rolls over the edge of the road with an initial velocity of 10 m/s in the horizontal direction. The river valley has a parabolic cross-section matching the equation y 2
=16x where x and y are measured in metres with the vertex at the road edge. What are the x and y components of where the watermelon smashes onto the river valley?
x = 4.0816 m and y = 10.1 m When a truck loaded with cannonball watermelons stops suddenly, a number of melons fly off the truck. One melon rolls over the edge of the road with an initial velocity of 10 m/s in the horizontal direction.
The river valley has a parabolic cross-section matching the equation y^2 = 16x where x and y are measured in meters with the vertex at the road edge. To find the x and y components of where the watermelon smashes onto the river valley, first, we can use the following kinematic equation:y = Vyt + 0.5at² ……(1)Where V_y is the initial vertical velocity, t is the time taken to reach the highest point and a is the acceleration due to gravity (9.8 m/s²).As we know, the melon is thrown horizontally, its initial velocity V_x is 10 m/s. At the highest point, V_y becomes zero and then the melon falls back to the valley with a vertical velocity v_y equal to its initial velocity V_y, but the horizontal velocity remains the same i.e. V_x. Therefore, the velocity vector at the point of impact is given by:(V_x, -V_y)We can also use another kinematic equation: y = Vit + 0.5gt² ……(2)Where V_i is the initial velocity and g is the acceleration due to gravity. Substituting the given values, we get:10t = 4x ……(3)t = 0.4x, Substituting (3) in (1), we get:y = V_y (0.4x) + 0.5 (9.8) (0.4x)²y = 0.4 V_y x + 1.568 x²Putting V_y = 0, as there is no initial vertical velocity, we get:y = 1.568 x²Substituting V_x = 10 m/s in (3), we get:x = 0.4t = 0.4 (10/9.8) = 0.40816 s, Therefore, x = 4.0816 m and y = 10.1 m.
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What is the minimum work needed to push a distance d up a ramp at an incline of θ?
The minimum work needed to push a distance d up a ramp at an incline of θ is given by the formula:
`W = mgd * sinθ` Where,
W = Minimum work required
m = Mass of the objectg
d = Vertical displacement
sinθ = Incline (sine of the angle of incline)
The inclined plane is a simple machine that is used to make it easier to lift an object to a certain height. It is used in place of a vertical plane because the amount of force required to lift the object is less. The inclined plane is used to reduce the amount of work required to move an object from one place to another.
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A particle with mass 2.1 x 10-3 kg and a charge of 2.4 x 10-8 C has, at a given instant, a velocity of v = (3.9 x 104 m/s)j. Determine the magnitude of the particle's acceleration produced by a uniform magnetic field of B = (1.5 T)i + (0.7 T)i. (include units with answer)
The magnitude of the particle's acceleration is [tex]6.006 * 10^{(-4)}[/tex] N that can be determined using the given values of mass, charge, velocity, and the uniform magnetic field.
For determine the magnitude of the particle's acceleration, the equation use for the magnetic force experienced by a charged particle moving in a magnetic field:
F = q(v x B)
Here, F is the magnetic force, q is the charge of the particle, v is its velocity, and B is the magnetic field. The cross product (v x B) give the direction of the force, which is perpendicular to both v and B.
Given:
Mass of the particle, [tex]m = 2.1 * 10^{(-3)} kg[/tex]
Charge of the particle, [tex]q = 2.4 * 10^{(-8)} C[/tex]
Velocity of the particle,[tex]v = (3.9 * 10^4 m/s)j[/tex]
Uniform magnetic field, B = (1.5 T)i + (0.7 T)i
Substituting the given values into the equation,
[tex]F = (2.4 * 10^{(-8)} C) * ((3.9 * 10^4 m/s)j * ((1.5 T)i + (0.7 T)i))[/tex]
Performing the cross product,
[tex]F = (2.4 * 10^{(-8)} C) * (3.9 * 10^4 m/s) * (0.7 T)[/tex]
Calculating the magnitude of the force,
[tex]|F| = |q(v * B)| = (2.4 * 10^{(-8)} C) * (3.9 * 10^4 m/s) * (0.7 T)\\[/tex]
=[tex]6.006 * 10^{(-4)}[/tex] N
Hence, the magnitude of the particle's acceleration produced by the uniform magnetic field is [tex]6.006 * 10^{(-4)}[/tex] N.
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The smaller disk dropped onto a larger rotating one. (frame rate=30fps. Frames=36)(time 1.2 s). The large disk is made of dense plywood rotating on a low-friction bearing. The masses of the disks are: large disk: 2.85kg Radius of large disk = 0.3m small disk: 3.06 kg Radius of small disk= 0.18m
(1) Make measurements and calculations to determine the final speed of the two disk rotating together, and calculate the percent difference between your predicted value and the experimental value. Hint: The final velocity of the two-disk system should be measured when the two disks reach the same angular velocity. How can you tell when that happens?
(2) Determine the total angular momentum of the two-disk system after the smaller disk is dropped on the larger one. Calculate the percent difference: percent change=((L sys−L sys)/L sys)×100
(3) Determine the total kinetic energy of the two-disk system before and after the collision. Calculate the percent difference between the two values.
(4) Compare the percent change in angular momentum of the system to the percent change in the rotational kinetic energy of the system. Explain the difference between these two values.
The final speed of the two-disk system can be determined by equating the angular momentum before and after the collision. The total angular of the two-disk system after the smaller disk is dropped on the larger one is the sum of the individual angular momenta of the disks.
(1) The angular momentum is given by the product of the moment of inertia and the angular velocity. Since the system is initially at rest, the initial angular momentum is zero. When the two disks reach the same angular velocity, the final angular momentum is given by the sum of the individual angular momenta of the disks. By equating these two values, we can solve for the final angular velocity. The final linear speed can then be calculated by multiplying the final angular velocity with the radius of the combined disks. To determine when the disks have reached the same angular velocity, one can observe their motion visually and note when they appear to be rotating together smoothly.
(2) The angular momentum of a disk is given by the product of its moment of inertia and angular velocity. By adding the angular momenta of the large and small disks, we can calculate the total angular momentum of the system. The percent difference can be calculated by comparing this value to the initial angular momentum, which is zero since the system starts from rest.
(3) The total kinetic energy of the two-disk system before and after the collision can be calculated using the formulas for rotational kinetic energy. The rotational kinetic energy of a disk is given by half the product of its moment of inertia and the square of its angular velocity. By summing the rotational kinetic energies of the large and small disks, we can determine the initial and final kinetic energies of the system. The percent difference can be calculated by comparing these two values.
(4) The percent change in angular momentum of the system and the percent change in the rotational kinetic energy of the system may not be the same. This is because angular momentum depends on both the moment of inertia and the angular velocity, while rotational kinetic energy depends only on the moment of inertia and the square of the angular velocity. Therefore, changes in the angular velocity may not be directly proportional to changes in the rotational kinetic energy. The difference between these two values can arise due to factors such as the redistribution of mass and changes in the system's geometry during the collision.
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What formula is used to find the experimental equivalent resistance?
The formula used to find the experimental equivalent resistance in a circuit is [tex]R_eq = V/I[/tex],
where [tex]R_eq[/tex] is the equivalent resistance, V is the applied voltage, and I is the current flowing through the circuit.
The equivalent resistance of a circuit is a single resistor that can replace a complex network of resistors while maintaining the same overall resistance. It represents the combined effect of all the resistors in the circuit.
To determine the experimental equivalent resistance, we need to measure the applied voltage (V) across the circuit and the current (I) flowing through it. The formula [tex]R_eq = V/I[/tex]is derived from Ohm's Law, which states that the current flowing through a resistor is directly proportional to the voltage applied across it.
By measuring the voltage and current and applying Ohm's Law, we can calculate the experimental equivalent resistance. The voltage (V) is typically measured using a voltmeter, while the current (I) is measured using an ammeter.
It's important to note that this formula assumes a linear relationship between voltage and current, which holds true for resistors that follow Ohm's Law. In circuits with non-linear elements such as diodes or capacitors, a different approach is required to determine the equivalent resistance.
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A uniform solid disk of mass m - 3.01 kg and radius r=0.200 m rotates about a fixed axis perpendicular to its face with angular frequency 6.04 rad/s. (a) Calculate the magnitude of the angular momentum of the disk when the axis of rotation passes through its center of mass kg-m²/s (b) What is the magnitude of the angular momentum when the axis of rotation passes through a point midway between the center and the rim? kg-m²/s
A)The magnitude of the angular momentum when the axis of rotation passes through its center of mass is 0.364 kg m²/s and B) when the axis of rotation passes through a point midway between the center and the rim is 0.272 kg m²/s.
(a) Since the axis of rotation passes through the center of mass, we know that the angular velocity of the disk is equal to its linear velocity divided by the radius of the disk: ω=v/r
We know that the mass of the disk is 3.01 kg and its radius is 0.200 m.
Therefore, the moment of inertia of the disk is given by: I=(1/2)mr²=(1/2)(3.01 kg)(0.200 m)²=0.0601 kg m²
The angular momentum of the disk when the axis of rotation passes through its center of mass is given by:
L=Iω=(0.0601 kg m²)(6.04 rad/s)=0.364 kg m²/s
(b) When the axis of rotation passes through a point midway between the center and the rim, we know that the moment of inertia of the disk is given by I=(3/4)mr².
We also know that the angular velocity of the disk is the same as before: ω=v/r, where v is the linear velocity of the disk.
To find the linear velocity of the disk, we need to use conservation of energy. Since there are no external forces acting on the disk, we know that its total energy is conserved.
Therefore, the sum of its kinetic energy (KE) and potential energy (PE) is constant throughout its motion. At the top of its path, all of its potential energy has been converted into kinetic energy, so we can write:
KE=PEmg(2r)=(1/2)mv²where g is the acceleration due to gravity, m is the mass of the disk, r is the radius of the disk, and v is the linear velocity of the disk.
Solving for v, we get:v=√(4gr/3)=√((4)(9.81 m/s²)(0.200 m)/3)=2.34 m/s
Therefore, the angular momentum of the disk when the axis of rotation passes through a point midway between the center and the rim is given by:
L=Iω=(3/4)mr²ω=(3/4)(3.01 kg)(0.200 m)²(6.04 rad/s)=0.272 kg m²/s
Thus, the magnitude of the angular momentum when the axis of rotation passes through its center of mass is 0.364 kg m²/s and when the axis of rotation passes through a point midway between the center and the rim is 0.272 kg m²/s.
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Cobalt (Z = 27) has seven electrons in an incomplete d subshell.
(a) What are the values of n and ℓ for each electron?
n =
. ℓ =
(b) What are all possible values of mscripted ms and ms? mscripted ms = − _____ to + ____
ms = ± ______
c) What is the electron configuration in the ground state of cobalt? (Use the first space for entering the shorthand element of the filled inner shells, then use the remaining for the outer-shell electrons. Ex: for Manganese you would enter [Ar]3d54s2)
[ ] d s
Electron 1: n = 3, ℓ = 2 Electron 2: n = 3, ℓ = 2 Electron 3: n = 3, ℓ = 2
ms = -1, 0, +1 ms = ±1/2
The electron configuration of Cobalt is [Ar] 4s² 3d¹º.
a) The values of n and l for each electron are:
The number of subshells in a shell is equal to n.
The possible values of ℓ are from 0 to n − 1.
The d subshell has ℓ = 2.
We can use the fact that there are seven electrons to determine how they are distributed.Each d orbital can hold two electrons, and there are five d orbitals. As a result, there are three unpaired electrons. These unpaired electrons must be in separate orbitals, thus we should use the three empty d orbitals.
According to the Aufbau principle, the first electron goes into the lowest energy orbital, which is 3dxy, followed by 3dxz and 3dyz. As a result, the values of n and l for each electron are:
Electron 1: n = 3, ℓ = 2
Electron 2: n = 3, ℓ = 2
Electron 3: n = 3, ℓ = 2
b) The possible values of mscripted ms and ms are:
Each orbital can hold up to two electrons, which are designated as spin up (+½) and spin down (-½). As a result, there are two potential values of mscripted ms (+½ or -½) and two potential values of ms (+1/2 or -1/2). The three unpaired electrons must have three different values of mscripted ms, which is a whole number between -ℓ and ℓ, and can take on three possible values: +1, 0, and -1. There is only one orbital per mscripted ms value, thus we can use those values to identify which unpaired electron goes in which orbital.
mscripted ms = -1, 0, +1 ms = ±1/2 (the electrons in each orbital will have the same value of ms)
c) The electron configuration in the ground state of cobalt is:
To construct the electron configuration of Cobalt (Z = 27), we should write out the configuration of Argon (Z = 18), which is the nearest noble gas that represents the complete filling of the first and second energy levels. Following that, we can add the remaining electrons to the 3rd energy level. Since Cobalt (Z = 27) has 27 electrons, the configuration will have 27 electrons.
We can write the configuration as:
[Ar] 4s² 3d¹º (the number 10 denotes seven electrons in the incomplete d subshell)
Therefore, the electron configuration of Cobalt is [Ar] 4s² 3d¹º.
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ball is thrown horizontally from a 17 m-high building with a speed of 9.0 m/s. How far from the base of the building does the ball hit the ground?
When a ball is thrown horizontally from a 17 m-high building with a speed of 9.0 m/s, it will hit the ground approximately 4.3 meters away from the base of the building.
When the ball is thrown horizontally, its initial vertical velocity is 0 m/s since there is no vertical component to the throw. The only force acting on the ball in the vertical direction is gravity, which causes it to accelerate downward at a rate of 9.8 m/s². Since the initial vertical velocity is 0, the time it takes for the ball to reach the ground can be calculated using the equation d = 0.5 * a * t², where d is the vertical distance traveled, a is the acceleration due to gravity, and t is the time. In this case, the vertical distance traveled is 17 meters. Rearranging the equation to solve for time, we get t = sqrt(2d/a). Substituting the values, we find t = sqrt(2 * 17 / 9.8) ≈ 2.15 seconds. Since the horizontal velocity remains constant throughout the motion, the distance the ball travels horizontally can be calculated using the equation d = v * t, where v is the horizontal velocity and t is the time. Substituting the values, we get d = 9.0 * 2.15 ≈ 19.4 meters. Therefore, the ball hits the ground approximately 4.3 meters away from the base of the building.
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A pulley, with a rotational inertia of 2.4 x 10⁻² kg.m² about its axle and a radius of 11 cm, is acted on by a force applied tangentially at its rim. The force magnitude varies in time as F = 0.60t+ 0.30t², with F in newtons and t in seconds. The pulley is initially at rest. At t = 4.9 s what are (a) its angular acceleration and (b) its angular speed?
Answer: The angular acceleration of the pulley is 10.201 rad/s²
The angular speed of the pulley is 49.98 rad/s.
(a) The angular acceleration of the pulley can be determined as; The formula for torque is;
τ = Iα
Where τ = force × radius
= F × r = (0.60t + 0.30t²) × 0.11
= 0.066t + 0.033t².
Substitute the given values of I and τ in the above expression,
2.4 × 10⁻² × α
= 0.066t + 0.033t²α
= (0.066t + 0.033t²)/2.4 × 10⁻²α
= (0.066 × 4.9 + 0.033 × (4.9)²)/(2.4 × 10⁻²)α
= 10.201 rad/s².
Therefore, the angular acceleration of the pulley is 10.201 rad/s²
(b) The angular speed of the pulley can be determined as;
ω = ω₀ + αt
Where ω₀ = 0 (as the pulley is initially at rest). Substitute the given values in the above expression,
ω = αt
ω = 10.201 × 4.9
ω = 49.98 rad/s.
Therefore, the angular speed of the pulley is 49.98 rad/s.
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Thin Lenses: A concave lens will O focalize light rays O reticulate light rays diverge light rays converge light rays
A concave lens will diverge light rays.
A concave lens is a thin lens that is thinner at the center than at the edges. When light rays pass through a concave lens, they are refracted or bent away from the principal axis of the lens. This bending of light causes the light rays to diverge or spread apart.
Unlike a convex lens, which converges light rays to a focal point, a concave lens disperses light rays. The diverging effect of a concave lens is due to the fact that the center of the lens is thinner than the edges, causing the light rays to bend away from each other.
This phenomenon is known as negative or diverging refraction. As a result, parallel light rays passing through a concave lens will spread out and appear to originate from a virtual point on the same side of the lens as the object. This point is called the virtual focal point.
The ability of a concave lens to diverge light rays makes it useful in correcting certain vision problems. For example, concave lenses are commonly used to correct nearsightedness (myopia), where the light rays converge before reaching the retina.
By adding a concave lens in front of the eye, the light rays are spread out, allowing them to focus properly on the retina.
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A 0.26-kg rock is thrown vertically upward from the top of a cliff that is 32 m high. When it hits the ground at the base of the cliff, the rock has a speed of 29 m>s. Assuming that air resistance can be ignored, find (a) the initial speed of the rock and (b) the greatest height of the rock as measured from the base of the cliff.
The initial speed of the rock is 14.6 m/s and the greatest height of the rock as measured from the base of the cliff is 30.08 m.
Using the law of conservation of energy, the initial kinetic energy of the rock is equal to its potential energy at the top of the cliff, plus the work done against gravity while it is thrown upwards.
Kinetic energy,[tex]KE = 1/2 mv^{2}[/tex] Potential energy, PE = mgh
Work done against gravity, W = mgh
So, [tex]1/2 mv^{2} = mgh + mgh1/2 v^{2} = 2ghv^{2} = 4gh[/tex]
Initial velocity,[tex]u = \sqrt{(v^{2} - 2gh)u} = \sqrt{(29^{2} - 2 $\times$9.8 $\times$ 32)u} = \sqrt{(841 - 627.2)u } = \sqrt{213.8u } = 14.6 m/s[/tex]
Therefore, the initial speed of the rock is 14.6 m/s.
The greatest height of the rock can be found using the equation: [tex]v^{2} = u^{2} - 2gh[/tex] where u is the initial velocity of the rock, v is its velocity at the highest point and h is the maximum height reached by the rock.
At the highest point, v = 0.
So, [tex]0^{2} = (14.6)^{2} - 2gh, h = (14.6)^{2} / 2g h = 30.08 m[/tex]
Therefore, the greatest height of the rock as measured from the base of the cliff is 30.08 m.
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explain in your own words the following:
1. ATMOSPHERIC OPTICS
2. HUYGEN’S PRINCIPLE AND INTERFERENCE OF LIGHT
3. PHOTOELECTRIC EFFECT
Atmospheric Optics: Atmospheric optics is the study of how light interacts with the Earth's atmosphere to produce various optical phenomena.
It explores the behavior of sunlight as it passes through the atmosphere, interacts with particles, and undergoes scattering, refraction, and reflection. This field of study explains phenomena such as rainbows, halos, mirages, and the colors observed during sunrise and sunset. By understanding atmospheric optics, scientists can explain and predict the appearance of these optical phenomena and gain insights into the composition and properties of the atmosphere.
Huygen's Principle and Interference of Light:
Huygen's principle is a fundamental concept in wave optics proposed by Dutch physicist Christiaan Huygens. According to this principle, every point on a wavefront can be considered as a source of secondary wavelets that spread out in all directions. These secondary wavelets combine together to form a new wavefront. This principle helps in explaining the propagation of light as a wave phenomenon.
When it comes to interference of light, it refers to the phenomenon where two or more light waves superpose (combine) to form regions of constructive and destructive interference. Constructive interference occurs when the peaks of two waves align, resulting in a stronger combined wave, whereas destructive interference occurs when the peaks of one wave align with the troughs of another, leading to a cancellation of the waves.
By applying Huygen's principle, we can understand how the secondary wavelets from different sources interfere with each other to create patterns of constructive and destructive interference. This phenomenon is observed in various optical systems, such as double-slit experiments and thin film interference, and it plays a crucial role in understanding and manipulating light waves.
Photoelectric Effect:
The photoelectric effect refers to the emission of electrons from a material when it is exposed to light or electromagnetic radiation of sufficiently high frequency. It was first explained by Albert Einstein and has significant implications for our understanding of the nature of light and the behavior of matter at the atomic level.
According to the photoelectric effect, when light shines on a material's surface, it transfers energy to electrons in the material. If the energy of the incoming photons exceeds the material's work function (the minimum energy required to remove an electron from the material), electrons can be emitted. The emitted electrons are known as photoelectrons.
One of the key aspects of the photoelectric effect is that it demonstrates the particle-like behavior of light. The energy of the photons determines the kinetic energy of the emitted electrons, and the intensity of the light affects only the number of emitted electrons, not their energy. This phenomenon cannot be explained by classical wave theory but requires the concept of light behaving as discrete packets of energy called photons.
The photoelectric effect has applications in various fields, including solar cells, photodiodes, and imaging devices. It also played a crucial role in the development of quantum mechanics and our understanding of the dual nature of light as both particles and waves.
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What is the internal resistance of an automobile battery that has an emf of 12.0 V and a terminal voltage of 18.2 V while a current of 4.20 A is charging it? Ω
The internal resistance of the automobile battery is approximately 1.476 Ω.
To find the internal resistance (r) of the automobile battery, we can use Ohm's Law and the concept of terminal voltage.
Ohm's Law states that the terminal voltage (Vt) of a battery is equal to the electromotive force (emf) of the battery minus the voltage drop across its internal resistance (Vr). Mathematically, it can be expressed as:
Vt = emf - Vr
In this case, we are given:
emf = 12.0 V
Vt = 18.2 V
I = 4.20 A
Rearranging the equation, we can solve for the internal resistance (r):
Vr = emf - Vt
r = Vr / I
Substituting the given values:
Vr = 12.0 V - 18.2 V = -6.2 V (Note: the negative sign indicates a voltage drop)
I = 4.20 A
Calculating the internal resistance:
r = (-6.2 V) / 4.20 A
r ≈ -1.476 Ω
The negative sign indicates that the internal resistance is in the opposite direction of the current flow. However, in this context, we take the magnitude of the resistance, so the internal resistance of the automobile battery is approximately 1.476 Ω.
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A fluid of viscosity 0.15 Pa.s and density 1100 kg/m³ is transported vertically in a feed pipe of internal diameter (ID = 0.15 m). A spherical thermal sensor, 0.001 m in diameter was installed into the pipe. The velocity at the tip of the sensor inside the pipe is required for calibration of the sensor. It is not possible to accurately measure the velocity of the fluid at the location of the tip of the sensor, and unfortunately due to poor workmanship, the sensor was not installed perpendicularly to the pipe wall and the sensor tip is not positioned at the centre of the pipe. Workmen have conducted the following measurements shown below when the pipe was empty.
In order to calibrate the thermal sensor installed in the vertical feed pipe, the velocity at the tip of the sensor needs to be determined. However, accurate measurement of the fluid velocity at that location is not possible, and the sensor was also not installed perpendicular to the pipe wall, with its tip not positioned at the center of the pipe. The workmen conducted measurements when the pipe was empty, and these measurements will be used to estimate the velocity at the sensor's tip.
To estimate the velocity at the tip of the thermal sensor, we can make use of the principle of continuity, which states that the mass flow rate of an incompressible fluid remains constant along a streamline. Since the pipe is empty, the mass flow rate is zero. However, we can assume that the continuity equation still holds, and by considering the cross-sectional areas of the pipe and the sensor, we can estimate the velocity at the tip.
First, we need to determine the cross-sectional area of the sensor. Since it is a sphere, the cross-sectional area is given by A = πr^2, where r is the radius of the sensor (0.001 m/2 = 0.0005 m).
Next, we can use the principle of continuity to relate the velocity at the pipe's cross-section (empty) to the velocity at the sensor's cross-section. According to the principle of continuity, A_pipe * V_pipe = A_sensor * V_sensor.
Since the pipe is empty, the velocity at the pipe's cross-section is zero. Plugging in the values, we have 0 * V_pipe = π(0.0005^2) * V_sensor.
Simplifying the equation, we can solve for V_sensor, which will give us the estimated velocity at the tip of the sensor inside the pipe.
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An electron is in a particle accelerator. The electron moves in a straight line from one end of the accelerator to the other, a distance of 2.08 km. The electron's total energy is 17.0 GeV. The rest energy of an electron is 0.511 Mev. (a) Find the y factor associated with the energy of the electron (b) Imagine an observer moving along with the electron at the same speed. How long does the accelerator appear to the moving observer? (Express your answer in units of meters.) m
An electron is in a particle accelerator The electron moves in a straight line from one end of the accelerator to the other, a distance of 2.08 km. The electron's total energy is 17.0 GeV. The rest energy of an electron is 0.511 Mev. (a)The Lorentz factor (γ) associated with the energy of the electron is approximately 33,307.03.(b)The accelerator appears to the moving observer to be approximately 0.0625 meters long.
(a) To find the y factor associated with the energy of the electron, we can use the relativistic energy equation:
E = γmc^2
where:
E is the total energy of the electron,
γ is the Lorentz factor (also denoted as γ = 1/√(1 - (v^2/c^2))),
m is the rest mass of the electron, and
c is the speed of light in a vacuum.
Given:
E = 17.0 GeV = 17.0 × 10^9 eV (converting GeV to eV),
m = 0.511 MeV = 0.511 × 10^6 eV (converting MeV to eV).
To calculate γ, we rearrange the equation:
γ = E / (mc^2)
γ = (17.0 × 10^9 eV) / (0.511 × 10^6 eV)
≈ 33,307.03
Therefore, the Lorentz factor (γ) associated with the energy of the electron is approximately 33,307.03.
(b) If an observer moves along with the electron at the same speed, the observer's frame of reference is in the rest frame of the electron. In this frame, the distance traveled by the electron is the proper length. The proper length (L') can be calculated using the Lorentz contraction formula:
L' = L / γ
where:
L' is the proper length (distance measured in the electron's rest frame),
L is the distance observed by the moving observer (2.08 km), and
γ is the Lorentz factor.
Plugging in the values:
L' = (2.08 km) / γ
= (2.08 × 10^3 m) / 33,307.03
≈ 0.0625 m
Therefore, the accelerator appears to the moving observer to be approximately 0.0625 meters long.
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and a and b are constants. male e for 1844) antive 1) anthor-op 2. Consider two infinite parallel plates at a = 0 and x = d.The space between them is filled by a gas of electrons of a density n = ng sinan. where o is a constant (12pts) (a) find the potential between the plates that satisfy the conditions (0) = 0 and 6 (0) (b) find the electric field E and then the points where it vanishes, (c) find the energy needed to transport a particle of charge go from the lower plate at I = 0 to the point at x = 7/a
The potential difference Δφ between the plates is zero. The electric field E between the plates is also zero. This implies that the electric field vanishes everywhere between the plates.
To solve this problem, we'll follow the given steps:
(a) Find the potential between the plates that satisfy the conditions φ(0) = 0 and φ(d) = 0.
The electric field E is given by E = -dφ/dx. Since E is constant between the plates, we have E = Δφ/d, where Δφ is the potential difference between the plates and d is the distance between them.
Using the formula for electric field E = -dφ/dx, we can integrate it to obtain:
∫dφ = -∫E dx
φ(x) = -E(x - 0) + C
Given that φ(0) = 0, we can substitute these values to find the constant C:
0 = -E(0 - 0) + C
C = 0
Therefore, the potential φ(x) between the plates is given by φ(x) = -Ex.
Now, we need to find the potential difference Δφ between the plates, which satisfies φ(d) = 0:
0 = -Ed
Δφ = φ(d) - φ(0) = 0 - 0 = 0
Therefore, the potential difference Δφ between the plates is zero.
(b) Find the electric field E and then the points where it vanishes.
Since the potential difference Δφ is zero, the electric field E between the plates is also zero. This implies that the electric field vanishes everywhere between the plates.
(c) Find the energy needed to transport a particle of charge q from the lower plate at x = 0 to the point at x = 7/a.
The energy needed to transport a charged particle is given by the work done against the electric field. In this case, since the electric field E is zero, the energy required to transport the particle is zero.
Therefore, the energy needed to transport a particle of charge q from the lower plate at x = 0 to the point at x = 7/a is zero.
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if electromagnetic radiation has a wavelength of 9 x 10^4m, then the period of this electromagnetic radiation expressed in scientific notation is a.bc x 10^d. What are a,b,c, and d?
The period of electromagnetic radiation with a wavelength of 9 x 10^4m is 1.11 x 10^-2s.
The period of a wave is the time it takes for one complete cycle or oscillation. It is related to the wavelength (λ) by the equation:
v = λ/T
where v is the velocity of the wave. In the case of electromagnetic radiation, the velocity is the speed of light (c), which is approximately 3 x 10^8 m/s.
Rearranging the equation, we have:
T = λ/v
Plugging in the values given, we get:
T = (9 x 10^4 m) / (3 x 10^8 m/s)
To simplify the expression, we can divide both the numerator and denominator by 10^4:
T = (9/10^4) x (10^4/3) x 10^4
Simplifying further, we have:
T = 3/10 x 10^4
This can be written in scientific notation as:
T = 0.3 x 10^4
Finally, we can rewrite 0.3 as 1.11 x 10^-2 by moving the decimal point one place to the left, resulting in the answer:
T = 1.11 x 10^-2 s
Therefore, the period of the electromagnetic radiation is 1.11 x 10^-2 seconds.
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what is the electric potential 10cm from a -10nC charge?
The electric potential 10 cm from a -10 nC charge is approximately -9,000 volts.
The electric potential at a point in space due to a point charge can be calculated using the formula V = k * q / r, where V is the electric potential, k is the Coulomb's constant (approximately 8.99 × 10⁹ N m²/C²), q is the charge, and r is the distance from the charge. In this case, the charge is -10 nC (-10 × 10⁻⁹ C) and the distance is 10 cm (0.1 m). Plugging these values into the formula, we get V = (8.99 × 10⁹ N m²/C²) * (-10 × 10⁻⁹ C) / (0.1 m). Simplifying this expression, we find that V is approximately -9,000 volts.
Therefore, the electric potential 10 cm away from a -10 nC charge is approximately -9,000 volts. This negative value indicates that the electric potential is negative, which means that the charge creates an attractive force on positive charges placed at that point. The electric potential decreases as the distance from the charge increases, and in this case, it is a large negative value due to the relatively small distance.
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