Question
14. A 0.1 kg ball moving to the right at a constant velocity of 2 m/s strikes a 0.4 kg ball that is at rest.
14. A 0.1 kg ball moving to the right at a constant velocity of 2 m/s strikes a 0.4 kg ball that is at rest. After the collision, the first ball rebounds straight back at 1.2 m/s. Calculate the final velocity of the second ball.
15. A 5000 kg train car moving at 5.2 m/s on a level, frictionless track, runs into a stationary 8000 tank car. If they hook together in the collision, how fast will they be moving afterwards?
16.A 75kg diver drops from a board 10 m above the water's surface. Find the diver's speed just before striking the water.
17. How does heat travel between two uneven temperature regions?
- from the cold region to the hot region
- from the hot region to the cold region
- heat flows back and forth between the two in even time intervals
- heat flows back and forth in a random pattern
18.An insulator . . .
- Allows a lot of heat to escape
- Makes the temperature of an object rise
- Moves heat from one place to another
- Traps heat inside an object
19.What happens when ice cubes melt in a glass?
- The water warms up due to the humidity
- Heat travels from the ice to the warmer water.
- No energy is transferred.
- Heat is transferred from the warmer water to the ice cubes.
20. Which of the following scenarios qualifies as simple harmonic motion?
- A cart going around and around on a ferry's wheel
- A child on a swing, moving back and forth
- A race car moving around and around a circular racetrack
- A tennis ball being hit back and forth over the net
21. What does the period of a pendulum depend upon?
a. mass
c. length
b. amplitude
d. none of above
22.Which one of the following statements is not true for a body vibrating in simple harmonic motion when damping is present?
- The damping force is always in the opposite direction to the velocity.
- The damping force is always in the opposite direction to the acceleration.
- The presence of damping gradually reduces the maximum potential energy of the system.
- The presence of damping gradually reduces the maximum kinetic energy of the system.
23.When is the pendulum at maximum velocity
- At its lowest point
- At its highest point
- It moves at a constant velocity
- It is at rest
24.The period of a pendulum may be decreased by
- Increasing the mass of the bob
- moving the equilibrium point
- decreasing the mass of the bob
- shortening the length of pendulum
Refer to the diagram below to answer questions #25 - #27
25.What is the letter a showing? ________
26.What is the letterb showing? ________
26.What is the letterc showing? ________
27.What is the letterdshowing? ________
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