Question 1 A pendulum of length L is suspended from the ceiling of an elevator. When the elevator is at rest, the period of the pendulum is T. How does the period of the pendulum change when the elevator moves upward with constant acceleration?

• The period does not change.
• The period increases.
• The period decreases.
• The period becomes zero.

Question 2 A 100-g ball falls from a window that is 12 m above ground level and experiences no significant air resistance as it falls. What is its momentum when it strikes the ground?

• 3.3 kg ? m/s
• 4.8 kg ? m/s
• 1.8 kg ? m/s
• 1.5 kg ? m/s

Question 3 The diagram below shows a system of two blocks. The masses of the blocks, and the velocities before and after, are shown.

3.0 m/'s 1.5 m/'s 1.8 m/'s 1.8 m/s 2 kq 8 kg 2 kg 8 kq Before After\f. KE = PE * * h 1 * mpellet * v- = mtotal *mtotal* gth U = m pellet