Answers
Answer:
D
Explanation:
This is a Doppler effect question. The answer is D because observer A hears a lower pitch than observer B, who hears a higher pitch. Look at how much closer together the sound waves are on the right vs. the left. The closer together the waves, the higher the frequency and the higher the pitch.
Related Questions
how is a flywheel constructed to maximize its rotational inertia? how is a flywheel constructed to maximize its rotational inertia? most of the mass is concentrated near a ring half way between the axis and the rim. most of the mass is concentrated near the axis. the mass is uniformly distributed across the radius of the disk. most of the mass is concentrated far from the axis.
Answers
To maximize its rotational inertia, a flywheel must be constructed in a way that "most of the mass is concentrated far from the axis."
Rotational inertia is the measure of a rotating object's resistance to change in its state of rotation. It is affected by the distribution of mass of the object, specifically the distance of the mass from the axis of rotation.
A flywheel is a mechanical device used to store rotational energy. To maximize the flywheel's rotational inertia, the mass of the flywheel should be concentrated as far away from the axis of rotation as possible. This is because the farther the mass is from the axis, the greater its effect on the flywheel's rotational inertia. Therefore, the correct answer to the question is "most of the mass is concentrated far from the axis."
A flywheel is constructed to maximize its rotational inertia by concentrating most of the mass far from the axis. This distribution of mass increases the flywheel's resistance to changes in rotational speed, enhancing its ability to store and release energy efficiently.
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How many molecules are in 5 moles of O2?
Answers
Answer:
One mole of O2 contains 6.022 x 10^23 molecules, therefore, 5 moles of O2 contain 3.011 x 10^24 molecules.
Explanation:
37.37.) pulsars a) spin very rapidly when they're young but slow down due to emitting radiation. b) are the cause of gamma-ray bursts. c) spin very slowly when they're young, and gradually spin faster as they age. d) generally form from 25 solar mass stars. e) emit radio radio in all directions
Answers
Pulsars spin very rapidly when they're young but slow down due to emitting radiation. The correct answer is option a.
What are pulsars?Pulsars are highly magnetized, rotating neutron stars that emit beams of electromagnetic radiation out of their magnetic poles. These beams can only be observed when they are oriented toward the observer, causing them to appear as pulses of radiation at regular intervals.
Pulsars were first observed in 1967 by Jocelyn Bell Burnell and Antony Hewish while studying interplanetary scintillation. Since their discovery, over 2,000 pulsars have been observed. Pulsars spin very rapidly, with some pulsars rotating hundreds of times per second.
They generally spin faster when they are young and slow down over time due to emitting radiation. Pulsars generally form from massive stars that have gone supernova. They emit radiation in a variety of wavelengths, including radio waves, X-rays, and gamma rays.
Therefore, Pulsars are known to spin very rapidly, with some rotating hundreds of times per second and they gradually slow down due to the loss of energy in the form of radiation.
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When Andy talked to his cousin in Ohio, she said it was raining. It was snowing at Andy’s house in Pennsylvania. What is the main reason for the difference in precipitation in the two locations?
Group of answer choices
air pressure
humidity
temperature
wind speed
Answers
The main reason for the difference in precipitation in the two locations is due to the difference in temperature. When temperatures are cold enough, the water vapor in the air will condense and form snowflakes.
The temperature in Ohio is likely not cold enough for snow, but the temperature in Pennsylvania is cold enough for the water vapor in the air to turn into snowflakes. The temperature in a given area is determined by a variety of factors, such as air pressure, humidity, and wind speed. Each of these factors can be different in each location, which can lead to a difference in temperature and, ultimately, a difference in precipitation.
Air pressure is the pressure of the atmosphere at a particular location as the higher the air pressure, the warmer the temperature. The humidity determines the amount of water vapor in the air and as the higher the humidity, the more water vapor is in the air and the more likely it is to condense into snow. Wind speed is the speed of the wind at a particular location also the faster the wind, the colder the temperature.
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If an object has constant velocity, zero or non-zero, what do we know about the arrows in a free-body diagram? What do we know about the arrows if the object accelerates? Explain your reasoning.
Answers
As a result, the arrows in the free-body diagram that indicate the forces operating on the object will be balanced, equal in magnitude, and pointing in the opposite direction.
What do the lines in the free body diagram stand for?Arrows used in free body diagrams to depict the various forces acting on an item. Force is a vector, as was previously stated. As a result, every force on a free body diagram has a value and a direction.
How can you determine whether an item is accelerating or not from a free body diagram?Newton's rule states that if the net force acting on an object is not zero, then the object's acceleration will also not be zero. Therefore, we will analyse the total force using the free body diagram.
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how would you expect the solar system and its bodies to be different if the frost line had been beyond the orbit of jupiter?
Answers
If the frost line had extended beyond Jupiter's orbit, the solar system and its components would have been very different. The frost line is the distance in the solar system.
where water and other volatile substances may condense into solid ice, and it is important in planet formation.The outer solar system's gas giants would not have grown as rapidly or as large as they did if there had been a frost line beyond Jupiter. This is because the absence of volatile chemicals in the outer areas would have delayed the process. Furthermore, because they developed closer to the frost line, the inner rocky planets, including Earth, would have had more water and volatile chemicals.a frost line beyond Jupiter would have had profound effects on the formation and composition of the solar system's planets and bodies.
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a dart of mass md is launched straight upward toward a block of mass mb that hangs at rest from a string, as shown in figure 1. immediately before the dart collides with the block, the dart has a speed v0 . the dart then collides with and sticks to the block, and the dart-block system travels upward to a height h before the system comes to rest, as shown in figure 2. what is the change in momentum of the dart-block system immediately before the collision to the instant when the system comes to rest?
Answers
The system comes to rest at height h, its final momentum is 0.
To find the change in momentum of the dart-block system, we need to compare the momentum immediately before the collision to the momentum when the system comes to rest. Let's follow these steps:
1. Calculate the initial momentum of the dart and block before the collision:
Since the block is at rest, its initial momentum is 0. The initial momentum of the dart is given by the product of its mass (md) and velocity (v0). So, initial momentum of the system is md*v0.
2. Determine the combined mass of the dart and block after the collision:
Since the dart sticks to the block, their combined mass is (md + mb).
3. Calculate the final velocity of the dart-block system just after the collision:
Using conservation of momentum, we can write the equation: (md * v0) = (md + mb) * vf, where vf is the final velocity of the system. Solve for vf: vf = (md * v0) / (md + mb).
4. Calculate the change in potential energy when the system rises to a height h:
The change in potential energy is given by ΔPE = (md + mb) * g * h, where g is the acceleration due to gravity.
5. Determine the initial kinetic energy just after the collision:
The initial kinetic energy (KE) is given by (1/2) * (md + mb) * vf^2.
6. Using conservation of energy, set the initial kinetic energy equal to the change in potential energy:
(1/2) * (md + mb) * vf^2 = (md + mb) * g * h.
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as a rock sinks deeper and deeper into water of constant density, what happens to the buoyant force on it if it started above the surface of the water?
Answers
The buoyant force on the rock will decrease as it sinks deeper and deeper into the water of constant density because the buoyant force is a function of the weight of the water displaced by the rock, and as the rock sinks, it is displacing less and less water.
As the rock sinks, the pressure on it increases and its volume decreases, causing the weight of the water it is displacing to decrease. As a result, the buoyant force on the rock decreases as it sinks deeper and deeper into the water.
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how does pressure at the bottom of a body of water relate to the weight of water above each square meter of the bottom surface
Answers
The pressure at the bottom of a body of water is directly proportional to the weight of water above each square meter of the bottom surface.
This relationship is described by the concept of hydrostatic pressure, which is the pressure exerted by a fluid at rest due to the weight of the fluid above it.
In a body of water, the weight of the water above each square meter of the bottom surface creates a force that is transmitted to the bottom as pressure.
This pressure is proportional to the weight of the water and is also distributed equally over each square meter of the bottom surface. According to the equation for hydrostatic pressure, the pressure at a point within a fluid is given by: P = ρgh
where P is the pressure, ρ is the density of the fluid, g is the acceleration due to gravity, and h is the height of the fluid column above the point. In the case of a body of water, the height h is replaced with the depth of the water.
Since the density of water is constant, the pressure at the bottom of a body of water is directly proportional to the depth of the water, which is equivalent to the weight of the water above each square meter of the bottom surface.
As the depth of the water increases, so does the weight of the water above the bottom surface, and hence the pressure at the bottom also increases in direct proportion.
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pls help me with this question I need it by Monday thanks Q3-4
Answers
The circuit voltages and currents are evaluated according to Ohm's law as follows;
a. 220 V
b. Please find attached the drawing of the circuit showing the required location of the switch, created with MS Word
c. i. 0.4 A
ii. The total current will remain the same
4. a. The over-voltage could burn the lamps
b. i. 6
ii. Please find attached the drawing of the circuit diagram created with MS Word
iii. Please find attached the drawing of the voltmeter in the circuit
5. a. 7 V
b. i. The voltage decreases in L1
ii. The current in the circuit is reduced by the addition of the new lamp
What is Ohm's Law?Ohm's law describe the relationship between the voltage, resistance, and current in an electric circuit. Ohm's Law states that the current, I, between two points in a conductor in a current carrying circuit, is directly proportional to the voltage, V, between the points.
Mathematically; V ∝ I
V = I·R
R = The resistance of the conductor
3. a. The arrangement of the lamps in parallel indicates that the voltage of the mains 220 V is the voltage across one of the lamps.
b. The location of the switch should be adjacent to the voltage source. Please see the attached drawing created with MS Word
c. i. The connection of the lamps in parallel, and the equivalence of the resistors in each lamp indicates that the current, I, flowing through each lamp can be obtained as follows;
I = 2.4 A/6 = 0.4 A
ii. When the two more lamps are added in parallel, the current through each lamp reduces while the total current in the circuit remain the same
4. a. The reason why Marcus cannot connect the lamps in parallel across the battery is because the voltage of each lamp (2.0 V) are lesser than the voltage of the battery (12 V). If the lamps are connected in parallel, they will draw excess current from the battery and they could burn out.
b. i The number of lamps that can be connected in series and work properly is; 12 V/(2 V/lamp) = 6 Lamps
ii. Please find attached the drawing of the lamps arranged in series created with MS Word
iii. Please find attached the drawing of the voltmeter, that can be used to measure the voltmeter across one lamp
5. a. The voltage across the buzzer is the difference between the voltage across the 9 V and the 2 V lamp, which is 7 V
b. i. The voltage across the circuit component will be shared such that the voltage drop across the L1 will decrease.
ii. According to Ohm's law, the current, I, is inversely proportional to the resistors, R, in a circuit.
I ∝ 1/R
The current in a circuit in series is the same for the components in the circuit, such that as the component increases, Ohm's law indicates that the current in the circuit will decrease.
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A slope of length 50 m rises to a height of 10 m above the ground. An effort of 100 N is needed to push a 250 N object up the ramp. Calculate: 1. AMA 2. VR 3. efficiency
Answers
1.) The AMA is 2.5
2.) The VR is 5.
3.) The efficiency is 50%.
Given that the object has a weight of 250 N and the effort needed to push it up the ramp is 100 N, we can calculate the AMA as follows:
AMA = Load / Effort
AMA = 250 N / 100 N
AMA = 2.5
Therefore, the AMA is 2.5.
To calculate the VR, we need to find the distance moved by the effort and the distance moved by the load. The distance moved by the effort is the length of the ramp, which is 50 m. The distance moved by the load is the height it is raised, which is 10 m. Therefore, we have:
VR = Distance moved by effort / Distance moved by load
VR = 50 m / 10 m
VR = 5
Therefore, the VR is 5.
To calculate the efficiency, we need to find the work done by the load and the work done by the effort. The work done by the load is:
Work done by load = Load x Distance moved by load
Work done by load = 250 N x 10 m
Work done by load = 2,500 J
The work done by the effort is:
Work done by effort = Effort x Distance moved by effort
Work done by effort = 100 N x 50 m
Work done by effort = 5,000 J
Therefore, the efficiency is:
Efficiency = (Load x Distance moved by load) / (Effort x Distance moved by effort)
Efficiency = (2,500 J) / (5,000 J)
Efficiency = 0.5 or 50%
Therefore, the efficiency is 50%.
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air at 320 k is flowing in a duct at a velocity of (a) 1, (b) 10, (c) 100, and (d) 1000 m/s. determine the temperature that a stationary probe inserted into the duct will read for each case.
Answers
The temperature that a stationary probe inserted into the duct will read for each case is as follows:(a) 320.0005 K(b) 320.0498 K(c) 324.9502 K(d) 815.02 K
The formula to calculate the temperature that a stationary probe inserted into the duct will read for each case is:
T = T0 + (v² / 2Cp)
where,
T0 is the temperature of the air in Kelvin,
v is the velocity of the air in m/s,
Cp is the specific heat capacity of air at a constant pressure of 101.325 kPa.
For each case given, the temperature that the stationary probe will read is as follows:
(a) v = 1 m/sT = 320 K + (1² / 2 * 1005 J/kg.K)T = 320 K + 0.0005 K = 320.0005 K
(b) v = 10 m/sT = 320 K + (10² / 2 * 1005 J/kg.K)T = 320 K + 0.0498 K = 320.0498 K
(c) v = 100 m/sT = 320 K + (100² / 2 * 1005 J/kg.K)T = 320 K + 4.9502 K = 324.9502 K
(d) v = 1000 m/sT = 320 K + (1000² / 2 * 1005 J/kg.K)T = 320 K + 495.02 K = 815.02 K
Thus, the temperature that a stationary probe inserted into the duct will read for each case is as follows:(a) 320.0005 K(b) 320.0498 K(c) 324.9502 K(d) 815.02 K
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How much power does the 2200kg truck develop running at the rate of 3.5ms² in 17s
Answers
Answer:
459.65 kilowatts.
Explanation:
This question involves calculating the power developed by a truck in motion, given its mass, rate of acceleration, and time.
The formula for power is:
Power = force x velocity
The formula for force is:
Force = mass x acceleration
We can begin by calculating the force applied on the truck:
Force = mass x acceleration Force = 2200kg x 3.5ms^-2 Force = 7700 N
Next, we need to calculate the velocity of the truck. We can use the following formula:
Velocity = Acceleration x Time
Velocity = 3.5ms^-2 x 17s Velocity = 59.5 m/s
Now we can calculate the power developed by the truck:
Power = Force x Velocity Power = 7700 N x 59.5 m/s Power = 459650 Watts or 459.65 kilowatts
Therefore, the power developed by the 2200kg truck running at a rate of 3.5ms^-2 for 17 seconds is 459.65 kilowatts.
Power developed by the truck at the given rate is 458 kW.
What is meant by power?Power of an object is defined as the rate of work done by it in unit time.
Here,
Mass of the truck, m = 2200 kg
Acceleration of the truck, a = 3.5 m/s²
Time taken by the truck, t = 17 s
Power of an object is the product of its force and velocity of the object.
Equation for power of the truck is given by,
Power = F x v
Force, F = m x a
F = 2200 x 3.5 = 7700 N
Velocity, v = a x t
v = 3.5 x 17
v = 59.5 m/s
Therefore,
Power = 7700 x 59.5
Power = 458 kW
Hence,
Power developed by the truck at the given rate is 458 kW.
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an object placed 12 cm from a concave mirror produces a real image 8.0 cm from the mirror. if the object is now moved to a new position 18.0 cm from the mirror, where is the new image located as measured from the mirror?
Answers
The new image is located at a measure of 7.5 cm from the mirror.
Using the mirror formula, 1/f = 1/do + 1/di, where f is the focal length, do is the object distance and di is the image distance.
Let's first find the focal length of the concave mirror. We can use the mirror formula with the given values of object distance and image distance:
[tex]1/f = 1/do + 1/di\\1/f = 1/0.12 + 1/0.08\\1/f = 8.33 + 12.5\\f = 1/20.83\\f = 0.048 m[/tex]
Now we can use the mirror formula again to find the new image distance when the object distance is 18.0 cm:
[tex]1/f = 1/do + 1/di\\1/0.048 = 1/0.18 + 1/di\\di = 0.048 * 0.18 / (0.18 - 0.048)\\di = 0.009936 / 0.132\\di = 0.075 m[/tex]
Therefore, the new image is located at almost 7.5 cm away from the mirror.
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a 960-m wide river flows at 16 m/s as shown in the figure. alice and john have a race in identical boats which each travel 20 m/s in still water. alice leaves point a and steers so that she goes straight to point b directly across and then back to a. john leaves point a and steers up to point c (960 m upstream) and then returns to a. which person arrives back at point a first?
Answers
Alice's 160 seconds is less than John's 266.67 seconds. Therefore, Alice arrives back at point A first.
To determine which person arrives back at point A first, we need to compare their respective travel times. Let's analyze each person's journey.
Alice:
1. Alice goes straight across the river to point B and back to point A.
2. The distance Alice covers is 2 × 960 m = 1920 m (twice the river width, since she goes there and back).
3. Alice's effective speed is the Pythagorean sum of her boat speed and the river speed: √(20² - 16²) = √(400 - 256) = √144 = 12 m/s.
4. Alice's travel time = distance / effective speed = 1920 m / 12 m/s = 160 seconds.
John:
1. John steers up to point C (960 m upstream) and then returns to point A.
2. The distance John covers is also 2 × 960 m = 1920 m (upstream and downstream).
3. When going upstream, John's effective speed is (20 - 16) m/s = 4 m/s. When going downstream, his effective speed is (20 + 16) m/s = 36 m/s.
4. John's travel time upstream = distance / effective speed upstream = 960 m / 4 m/s = 240 seconds.
5. John's travel time downstream = distance / effective speed downstream = 960 m / 36 m/s = 26.67 seconds.
6. John's total travel time = 240 + 26.67 = 266.67 seconds.
Comparing their travel times, Alice's 160 seconds is less than John's 266.67 seconds. Therefore, Alice arrives back at point A first.
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Determine how much current will pass through resistance R1 if U(BC)=6V, R1=2 ohms, R2=6 ohms, R3=1 ohm, R4=1 ohm
Answers
The current that will pass through resistance R1 if U(BC) = 6V,is 3A when the resistances are as follows: R1=2 ohms, R2=6 ohms, R3=1 ohm, R4=1 ohm.
Given the voltage in the circuit (V) = 6V
The resistance of resistor R1 = 2ohms
The resistance of resistor R2 = 6ohms
The resistance of resistor R3 = 1ohms
The resistance of resistor R4 = 1ohms
As we can see from the diagram given that the resistors R1 and R4 are connected in parallel, which combinedly is connected in series with R2 and then total is connected in parallel with R3.
The current that will pass through resistance R1 can be determined by using Ohm's Law. This law states that the current (I) is equal to the voltage (V) divided by the resistance (R). In this case, the voltage across R1 is the same as the voltage across the circuit (U(BC)), which is 6V. Therefore, the current through R1 is:
I = 6V / 2 ohms = 3A
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The distance from Earth to Mars is 54.6 millions kilometers. A helium molecule has a length of approximately 280 picometers. Find how many helium molecules could fit between these two planets.(Tip: research what are picometers)
Answers
Answer:
Approximately 1.95 x 10^20 helium molecules
Explanation:
A picometer is a unit of length equal to one trillionth of a meter, or 10^-12 meters. To find out how many helium molecules could fit between Earth and Mars, we need to first calculate the distance between them in picometers:
54.6 million kilometers = 54.6 x 10^9 meters
54.6 x 10^9 meters = 54.6 x 10^21 picometers (since there are 10^12 picometers in a meter)
Next, we need to calculate how many helium molecules can fit in this distance. We can do this by dividing the distance between Earth and Mars by the length of a helium molecule:
54.6 x 10^21 picometers / 280 picometers per helium molecule
= 1.95 x 10^20 helium molecules
Therefore, approximately 1.95 x 10^20 helium molecules could fit between Earth and Mars, assuming they were lined up end to end without any space between them.
As shown in the diagram below, seven forces all with magnitude || = 31 N are applied to an irregularly shaped object. Each force is applied at a different location on the object, indicated by the tail of the arrow; the directions of the forces differ. The distances shown in the diagram have these values: w = 8 m, h = 12 m, and d = 11 m.
For each force, calculate the z component of the torque due to that force, relative to location A (x to the right, y up, z out of the page). Make sure you give the correct sign.
(1) A,1,z = N · m
(2) A,2,z = N · m
(3) A,3,z = N · m
(4) A,4,z = N · m
(5) A,5,z = N · m
(6) A,6,z = N · m
(7) A,7,z = N · m
Relative to location A, what is the z component of the net torque acting on this object?
A,net,z = _____ N · m
Answers
The net torque is given by:mA,net,z = τ1,z + τ2,z + τ3,z + τ4,z + τ5,z + τ6,z + τ7,z = (−22wi − 13wj) N · m.
When answering questions on the Brainly platform, it is important to always be factually accurate, professional, and friendly. You should be concise and avoid providing extraneous amounts of detail. Additionally, you should not ignore any typos or irrelevant parts of the question.
Finally, when answering this specific question, you should use the following terms in your response:As shown in the diagram below, seven forces all with magnitude || = 31 N are applied to an irregularly shaped object. Each force is applied at a different location on the object,
indicated by the tail of the arrow; the directions of the forces differ. The distances shown in the diagram have these values: w = 8 m, h = 12 m, and d = 11 m.(7) A,7,z = N · mA,net,z = _____ N · mTo find the torque about the z-axis (A,7,z), we can use the formula:τ = r x Fwhere τ is the torque,
r is the position vector, and F is the force vector. We can also use the right-hand rule to determine the direction of the torque. If we curl the fingers of our right hand in the direction of r x F, then our thumb will point in the direction of the torque.For each of the seven forces,
we can calculate the torque about the z-axis using the formula above. The position vector for each force is given by the distance from A,7 to the tail of the arrow. The force vector is given by the arrow itself. To simplify the calculations, we can choose a coordinate system such that the x-axis passes through A,7 and is perpendicular to the plane of the diagram.
Then, the y-axis is parallel to the plane of the diagram and passes through A,7, and the z-axis is perpendicular to the plane of the diagram and passes through the center of mass of the object.
With this coordinate system, we can write the position vectors and force vectors in terms of their x, y, and z components.For example, the torque due to force 1 can be written as:τ1,z = (−w/2)i x (−31sin(30°)j) = −15.5wi − 8.5wjwhere i, j, and k are unit vectors in the x, y, and z directions, respectively.
The negative signs indicate that the torque is in the clockwise direction.Using this method, we can find the torque due to each force and then add them up to get the net torque about the z-axis.
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a bowling ball weighing 57.5 n initially moves at a speed of 4.30 m/s. how long must a force of 44.0 n be applied to the ball to stop it?
Answers
Answer:t = 1.27 s
Explanation:
Given
Initial velocity(vi)=4.30m/s
final velocity(vf)=0
F = 44.0 N
M=57.5/9.8(considering g=9.8)
vf = vi + (Fnet / m) * t
t = (m * (vf - vi)) / Fnet
Substituting the given values, we get:
t = (57.5 N / 9.81 m/s^2) * (0 - 4.30 m/s) / (-44.0 N)
t = 1.27 s
A force of 44.0 N must be applied to the bowling ball for 6.98 seconds to stop it.
To determine how long a force of 44.0 N must be applied to a 57.5 N bowling ball moving at an initial velocity of 4.30 m/s to stop it, we can use the formula for the final velocity of an object subjected to a constant force:
final velocity = initial velocity + (force/mass) x time
Since we want to stop the ball, final velocity is 0. We can rearrange formula to solve for time:
time = (mass x (final velocity - initial velocity))/force
Substituting in given values, we get:
time = (57.5 kg x (0 m/s - 4.30 m/s))/44.0 N = 6.98 seconds
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stand a meterstick on its end and let it rotate to the floor. if you attach a heavy glob of clay to its upper end and repeat, the time to fall will be
Answers
When you stand a meterstick on its end and let it rotate to the floor, the time it takes to fall is dependent on the moment of inertia.
If you attach a heavy glob of clay to its upper end and repeat the experiment, the time it takes to fall will be longer. The moment of inertia is defined as the resistance of an object to rotational motion. It is dependent on the shape and mass distribution of an object. The clay's addition to the meterstick's upper end changes the mass distribution of the object and increases its moment of inertia. As a result, the object will take longer to fall because it has more resistance to rotational motion.
In summary, the time it takes for a meterstick to fall is dependent on its moment of inertia. Adding a heavy glob of clay to its upper end increases the moment of inertia, resulting in a longer time for it to fall.
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a table tennis ball has a diameter of 3.80 cm and average density of 0.084 0 g/cm3. What force is required to hold ir completely submerged under water?
Answers
The amount of force necessary to keep it submerged in water is F=0.258N.
The force required to hold a table tennis ball submerged in water is calculated using the formula:
[tex]F =\frac{ (\rho * V * g) }{ A}[/tex]
Where F is the force, ρ is the water's density, V is the ball's volume, g is its gravitational acceleration, and A is its cross-sectional area.
The following formula is used to determine the ball's volume:
[tex]V = \frac{4}{3}*pi*r^3[/tex]
where r is the ball's radius.
The radius of the ball is half its diameter, thus:
[tex]r = 3.8 cm^2[/tex]
Therefore,
[tex]V = \frac{4}{3}*pi *(3.8 cm ^2)3\\V = 0.5222 cm3[/tex]
The cross-sectional area of the ball is calculated using the formula:
[tex]A = \pi * r^2\\\\A = \pi* (\frac{3.8 cm }{ 2})^2\\A = 4.5257 cm^2[/tex]
Substituting the values in the above formula,
[tex]F =\frac{ (0.084 g/cm^3 * 0.5222 cm^3 * 9.8 m/s^2) }{4.5257 cm^2}\\F = 0.258 N[/tex]
Hence, the force needed to keep it submerged in water is 0.258N
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when the sun sets, which material would cool down the fastest, assuming they all have the same mass and initial temperature?
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When the sun sets, water would cool down the fastest.
When the sun sets, the material that would cool down the fastest, assuming they all have the same mass and initial temperature, is the one with the lowest specific heat capacity.
Specific heat capacity is the amount of heat required to raise the temperature of one gram of a substance by one degree Celsius.
The specific heat capacity of a substance is a measure of how much energy is required to raise the temperature of a given amount of that substance by one degree Celsius.
It is defined as the amount of heat required to raise the temperature of one unit of mass of the substance by one degree Celsius.
The specific heat capacity of a material varies depending on its chemical makeup.
Metals, for example, have a low specific heat capacity, meaning that they heat up and cool down rapidly.
Conversely, water has a high specific heat capacity, meaning that it heats up and cools down more slowly than metals.
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which of the following best describes how a homeowner using an off-the-grid pv solar system, in the same country as seen in the graph above, can power a home between 9:00 pm and 6:00 am? responses switching to the electrical grid to obtain power switching to the electrical grid to obtain power relying on sources like wind or hydroelectricity in times of darkness relying on sources like wind or hydroelectricity in times of darkness using excess energy from a sunny day stored in batteries for power using excess energy from a sunny day stored in batteries for power burning wood to create heat and light for the home.
Answers
Using excess energy from a sunny day stored in batteries is the best option for off-the-grid PV solar systems at night.
Based on the information given, the best option for a homeowner using an off-the-grid PV solar system to power a home between 9:00 pm and 6:00 am would be to use excess energy from a sunny day stored in batteries for power. This means that the solar panels would generate excess energy during the day which would be stored in batteries to be used at night. This is common practice in off-the-grid solar systems and is an effective way to ensure consistent power supply. Switching to the electrical grid or relying on other sources of energy like wind or hydroelectricity would not be feasible for an off-the-grid solar system. Burning wood for heat and light could be an option but it would not be directly related to the solar system.
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the types of current carried by the headlights of an automobile, and by a plug-in toaster in your kitchen, are group of answer choices none of these. dc and ac, respectively. ac and dc, respectively. both ac. both dc.
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The types of current carried by the headlights of an automobile, and by a plug-in toaster in your kitchen, are AC and DC, respectively.
When we consider the types of current carried by the headlights of an automobile and by a plug-in toaster in your kitchen, the current is different. The headlights of an automobile use DC or Direct Current. The battery is the primary source of energy in a vehicle. As a result, direct current is used. AC or Alternating Current is used by a plug-in toaster in your kitchen.
An electric current that alternates in polarity, switching directions at regular intervals, is known as alternating current. Alternating current (AC) is a type of current that changes direction on a regular basis. It alternates in polarity from a positive charge to a negative charge. The voltage in alternating current increases and decreases periodically.
AC power is generated, transmitted, and distributed because it can be modified with transformers to alter the voltage and current levels. The use of DC or AC is determined by the application. The use of DC or Direct Current is ideal for applications that require constant voltage and current supply, such as lighting and electronic devices.
Alternating current is suitable for power transmission and distribution because it can be easily transformed from one voltage level to another. So, the answer is ac and dc, respectively.
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a 35.8 l cylinder of ar (g) is connected to an evacuated 1875 l tank so that the gas now is spread over both vessels. if the temperature is held constant and the final pressure is 721 mmhg, what must have been the original gas pressure in the cylinder, in atmospheres?
Answers
The original gas pressure in the 35.8 l cylinder of ar (g) connected to an evacuated 1875 l tank was 50.66 atm.
The combined volume of the cylinder and the tank = 35.8 L + 1875 L = 1910.8 L
The final pressure (Pf) = 721 mmHg
The original gas pressure in the cylinder (Pi) can be calculated using Boyle's Law which states that pressure and volume are inversely proportional to each other at constant temperature.Boyle's law equation:
P₁V₁ = P₂V₂
Where,P₁ = the original pressure in cylinder
V₁ = the volume of the cylinder
P₂ = the final pressure when the cylinder gas is spread over both vessels (i.e., in the cylinder and the tank)
V₂ = the combined volume of the cylinder and tank
The equation can be rearranged to solve for the original pressure in the cylinder (P₁):P₁ = P₂ (V₂ / V₁)
Substituting the values:P₁ = (721 mmHg) (1910.8 L / 35.8 L) = 38411.1 mmHg = 50.66 atm (rounded to two decimal places)Therefore, the original gas pressure in the cylinder was 50.66 atm.
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the two very long straight wires carries currents directed as shown. the wires are separated by a distance 4d with i1 two times as large as i2. the magnetic field due to i2 at a distance d above i2 has magnitude bo. what is the total magnetic field at this point due to both wires?
Answers
The total magnetic field at the point above wire 2 is (5/3) times the magnetic field due to wire 2 alone.
To find the total magnetic field at a point, we need to add up the magnetic fields due to each wire separately. The magnetic field due to a long straight wire carrying current will be given by;
B = μ0 × I / (2π × r)
where μ0 is the permeability of free space, I is the current in the wire, and r is the distance from the wire.
Let's first find the magnetic field due to wire 2 at the point above it:
B₂ = μ0 × i₂ / (2π × d)
Given that the magnetic field due to wire 2 at this point has a magnitude of bo, we can write;
bo = μ0 × i₂ / (2π × d)
Rearranging, we get:
i₂ = (2π × d × bo) / μ0
Now, the current in wire 1 is twice as large as the current in wire 2, so:
i₁ = 2 × i₂ = (4π × d × bo) / μ0
The distance between the wires is 4d, so the total magnetic field at the point above wire 2 is given by;
Btotal = B₁ + B₂
where B₁ is the magnetic field due to wire 1 at the point. Using the formula for magnetic field due to a long straight wire, we can write;
B1 = μ0 × i₁ / (2π × 3d)
Substituting the values of i₁ and i₂, we get
B₁ = μ0 × (4π × d × bo) / (2π × 3d) = (2/3) × μ0 × bo
So, the total magnetic field at the point above wire 2 will be;
Btotal = B₁ + B₂ = (2/3) × μ0 × bo + μ0 × i₂ / (2π × d)
Substituting the value of i₂, we get;
Btotal = (2/3) × μ0 × bo + μ0 × (2π × d × bo) / (2π × d)
= (5/3) × μ0 × bo
The total magnetic field at this point will be 5/3.
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we have 100.0 kg of skim milk at 0% fat and 2.5% protein. how many kg of milk at 2.0% fat and 2.1% protein, and whole milk at 3.5% fat and 1.9% protein must be added to the skim milk to get a final milk that is 1.6% fat and 2.2% protein?
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We have 100.0 kg of skim milk at 0% fat and 2.5% protein. approximately 298.48 kg of milk A and 200.05 kg of whole milk B should be added to the skim milk to get the desired final mixture.
Let x kg of milk with 2.0% fat and 2.1% protein (Milk A) be added to the skim milk. Let y kg of whole milk with 3.5% fat and 1.9% protein (Milk B) be added. We need to find x and y for the final mixture.
1. Fat content equation:
(0.00 * 100) + (0.02 * x) + (0.035 * y) = 0.016 * (100 + x + y)
2. Protein content equation:
(0.025 * 100) + (0.021 * x) + (0.019 * y) = 0.022 * (100 + x + y)
Step 1: Solve the fat content equation for y:
0.02 * x + 0.035 * y = 1.6 + 0.016 * x + 0.016 * y
0.019 * x + 0.02 * y = 1.6
y = (1.6 - 0.019 * x) / 0.02
Step 2: Substitute the value of y in the protein content equation:
0.025 * 100 + 0.021 * x + 0.019 * (1.6 - 0.019 * x) / 0.02 = 0.022 * (100 + x)
2.5 + 0.021 * x + 0.019 * (1.6 - 0.019 * x) = 2.2 + 0.022 * x
Step 3: Solve for x:
0.021 * x - 0.022 * x = 2.5 - 2.2 - 0.019 * 1.6 / 0.02
-0.001 * x = 0.3 - 0.00152
x = (0.3 - 0.00152) / -0.001
x ≈ 298.48
Step 4: Calculate y using the value of x:
y = (1.6 - 0.019 * 298.48) / 0.02
y ≈ 200.05
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a 0.25 kg ball is attached to the end of a string. it is swung in a vertical circle of radius 0.60 m. at the top of the circle its velocity is 6.0 m/s. what is the tension in the string?.
Answers
The tension in the string is 17.45 N. Tension is the force exerted by a string, rope, or cable on an object that is attached to it. In this case, the string is exerting tension on the ball, keeping it in a circular motion.
Mass of the ball, m = 0.25 kg
The radius of the circle, r = 0.60 m
The velocity of the ball at the top of the circle, v = 6.0 m/s
Let's find the tension in the string using the following steps;
At the top of the circle, the gravitational force is acting downwards and the tension force is acting upwards.
So, we can find the net force acting on the ball using the following equation:
Net force,
F = mv²/r
Where m is the mass of the ball
v is the velocity of the ball at the top of the circler is the radius of the circle
Substituting the given values, we get;
F = (0.25 kg) × (6.0 m/s)² / (0.60 m)
F = 15.0 N
Tension force,
T = F + mg
Where g is the acceleration due to gravity.
Substituting the given values, we get;
T = 15.0 N + (0.25 kg) × (9.8 m/s²)
T = 17.45 N
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three balls, with masses of 3m, 2m, and m, are fastened to a massless rod of length l as shown. the rotational inertia about the left end of the rod is:
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The required rotational inertia about the left end of the rod is calculated to be 3ML²/2.
A body's inertia is a property that makes it resist efforts to set it in motion or, if it is already moving, to change the speed or direction of it.
The inertia of a substance is a passive quality that only enables it to withstand active agents like forces and torques. To determine the left's spinning inertia,
I = I₁ + I₂ + I₃ = 3 M(0)² + 2M(L/2)² + M(L)² = 3ML²/2
Thus, the required rotational inertia about the left end of the rod is calculated to be 3ML²/2.
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a proton with kinetic energy 4*10^-6 moves perpendicular to magnetic field of 0.5T what is the radius of circular path
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Answer:
The radius of the circular path that the proton follows can be calculated using the formula: r = (m*v)/(q*B) where m is the mass of the proton, v is its velocity, q is its charge, and B is the strength of the magnetic field. The mass of the proton is approximately 1.67 x 10^-27 kg, and its charge is 1.6 x 10^-19 C. The velocity of the proton can be calculated using the formula: KE = (1/2)*m*v^2 where KE is the kinetic energy of the proton. Substituting the given value of KE = 4 x 10^-6 J and solving for v, we get: v = sqrt((2*KE)/m) = 1.89 x 10^5 m/s Substituting these values into the formula for the
The radius of the circular path is 0.0082 meters or 8.2 millimeters.
What is the magnetic field?A magnetic field is a region of space around a magnet or a moving electric charge where magnetic forces can be observed. It is a vector field, which means that it has both magnitude and direction at each point in space. Magnetic fields are created by electric currents and the intrinsic magnetic moments of elementary particles such as electrons, protons, and neutrons.
Here in the Question,
The proton moves perpendicular to the magnetic field, so it will experience a magnetic force given by:
F = qvB
Where
q =is the charge of the proton (+1.602 × 10^-19 C),
v =is the velocity of the proton,
B =is the magnetic field strength (0.5 T).
The magnetic force is centripetal in nature, so it provides the necessary force to keep the proton moving in a circular path. The force is given by:
F = mv^2/r
Where
m = is the mass of the proton (1.673 × 10^-27 kg)
r = is the radius of the circular path.
Setting these two equations equal to each other and solving for r, we get:
mv^2/r = qvB
r = mv/(qB)
Putting the given values, we get:
r = (1.673 × 10^-27 kg) * sqrt((4*10^-6 J) / (2 * 1.602 × 10^-19 C * 0.5 T))
r = 0.0082 meters or 8.2 millimeters (rounded to two significant figures)
Therefore, the radius of the circular path is approximately 8.2 millimeters.
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