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20 Cards in this Set
- Front
- Back
Five motion diagrams, in which points represent the positions of an object at equal time intervals, are shown below. Which statement is correct? |
D speeds up and then slows down |
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A race car moving with a constant speed of 60 m/s completes one lap around circular track in 50 s What is the magnitude of the centripetal acceleration of the race car? |
7.5 m/s^2
60X50=3000 3000=2(pie)r r=477.46m a=60^2/477.46=7.5 |
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A juggler throws two balls to the same height so that one is at the halfway point going up when the other is at the hallway point coming down. At that point: |
Their accelerations are equal but their velocities are equal and opposite. |
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Which of the following situations is impossible about an object? |
An object has constant nonzero velocity and changing acceleration. |
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The net force on a moving object suddenly becomes zero and remains zero. The object will |
Continue at constant velocity. |
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What force keeps your car from sliding off the road as you round a corner? |
Static friction towards the center of the curve you are traveling in. |
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Which of the following describes a real object for which the figure below is the correct free body diagram? |
A space shuttle has just been launched and it is a few meters above the ground. The rocket boosters are firing and its speed is increasing rapidly. |
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Two rocks that are equal mass are tied to massless strings and whiled in nearly horizontal circles at the same speed. One string is twice as long as the other. What is the tension in the shorter string compared to the tensions in the longer one? |
T1=2(T2)
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In the figure a 10 kg mass is suspended from two spring scales that read in kilograms, each of which has negligible weight. Which statement is correct? |
Each scale will read 10 kg |
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A spring gun shoots out a plastic ball at speed v. The spring is then compressed twice the distance is was on the first shot. By what factor is the ball's speed increased? |
2 |
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A pendulum swings in a vertical plane. At the bottom of the swing, the kinetic energy is 8 J and the gravitational potential energy is 4 J. A the highest point of its swing, the kinetic and gravitational potential energies are |
Kinetic energy=0J, Gravitational Potential Energy=12 J |
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As a simple pendulum swings back and forth, the forces acting on the suspended mass are the force of gravity, the tension in the supporting cord, and air resistance. Which of these forces only does negative work during the motion of the pendulum? |
Air Resistance |
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The planet Saturn has about 100 times the mass of the earth and is about 10 times farther from the sun than the earth is. Compared to the acceleration of the earth caused by the sun's gravitational pull, how great is the acceleration of saturn due to the sun's gravitation? |
1/100 as great |
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If a constant non-zero net torque is applied to an object that object will |
rotate with constant angular acceleration |
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The horizontal bar in the figure will remain horizontal if. . . |
R1=R2 and M1=M2 |
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The Earth orbits the Sun in an elliptical orbit. Ignore any friction which may be present. What happens over time to the Earth's angular momentum about the Sun? |
It remains constant |
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The space station stabilizer tickets are malfunctioning, but the space station rotation rate must be slowed down before a supply ship can dock with it. Which of the following actions of the astronauts would slow the rotation rate of the space station? |
Move as much mass as far as possible away from the axis of rotation of the space station. |
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A small object is attached to a horizontal spring and set in simple harmonic motion with amplitude A and period T. How long does it take for the object to travel a total distance of 6A. |
3T/2 |
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The graph below shows the velocity versus time graph for a ball. While explanation best fits motion of the ball as shown by the graph? |
The ball is rising, hits the ceiling, and falls down. |
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What impulse does the force shown in the figure exert on a 250 g particle? |
4 Ns |
