Question

1. A centrifuge in a medical laboratory rotates at a rotational speed of 3600 rev/min. When turned off, it rotates 20.0 times at a constant angular acceleration before coming to rest. The angle through which the centrifuge rotates before coming to rest is

A. 3.18 rad

B. 20.0 rad

C. 80.0 rad

D. 126 rad

E. None of the above.

2. A very light particle traveling 23 m/s elastically collides (in one dimension) with a massive target that was initially at rest. After the collision, what is the velocity of the projectile?

A. is -23 m/s

B. is 0 m/s

C. is -46 m/s

D. cannot be determined (masses not known)

E. None of the above.

Answer 1