Author Question: In a ballistics test, a 28-g bullet pierces a sand bag that is 30cm thick. If the initial bullet ... (Read 172 times)

rosent76 · **on:** Jul 29, 2018

In a ballistics test, a 28-g bullet pierces a sand bag that is 30cm thick.

If the initial bullet velocity was 55m/s and it emerged from the sandbag moving at 18m/s what was the magnitude of the friction force (assuming it to be constant) that the bullet experienced while it traveled through the bag?
A) 1.3 N B) 130 N C) 38 N D) 13 N

Question 2

A 3.0-kg object and a 5.0-kg object hang vertically at the opposite ends of a very light rope that goes over an ideal pulley. If the objects are gently released, what is the resulting acceleration of the objects?

A) 0.00 m/s2
B) 3.7 m/s2
C) 2.5 m/s2
D) 4.9 m/s2
E) 6.1 m/s2