Final Exam Summer 1 '02
Physics 161 E. Gortcheva
07/12/02
I. Some multiple-choice questions:
(i)[ 4pts] A ball falls to the ground from height h and bounces to height h'. Momentum is conserved in the ball-earth system:

a. no matter what height h' it reaches.
b. only if h' < h.
c. only if h' = h.
d. only if h' > h.
e. only if h' >= h.

(ii)[4 pts] If you know the impulse that has acted on a body of mass m you can calculate:

a. its initial velocity.
b. its final velocity.
c. its final momentuin.
d. the change in its velocity.
e. its acceleration during the impulse.

(iii)[4 pts] Which of the following quantities is conserved for a planet orbiting a star in a circular orbit?

a. Momentum and energy.
b. Energy and angular momentum.
c. Momentum and angular momentum.
d. Momentum, angular momentum and energy.
e. None of the above.