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?

1. from the cold region to the hot region
2. from the hot region to the cold region
3. heat flows back and forth between the two in even time intervals
4. heat flows back and forth in a random pattern

18.An insulator . . .

1. Allows a lot of heat to escape
2. Makes the temperature of an object rise
3. Moves heat from one place to another
4. Traps heat inside an object

19.What happens when ice cubes melt in a glass?

1. The water warms up due to the humidity
2. Heat travels from the ice to the warmer water.
3. No energy is transferred.
4. Heat is transferred from the warmer water to the ice cubes.

20. Which of the following scenarios qualifies as simple harmonic motion?

1. A cart going around and around on a ferry's wheel
2. A child on a swing, moving back and forth
3. A race car moving around and around a circular racetrack
4. 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?

1. The damping force is always in the opposite direction to the velocity.
2. The damping force is always in the opposite direction to the acceleration.
3. The presence of damping gradually reduces the maximum potential energy of the system.
4. The presence of damping gradually reduces the maximum kinetic energy of the system.

23.When is the pendulum at maximum velocity

1. At its lowest point
2. At its highest point
3. It moves at a constant velocity
4. It is at rest

24.The period of a pendulum may be decreased by

1. Increasing the mass of the bob
2. moving the equilibrium point
3. decreasing the mass of the bob
4. 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? ________