Author Question: A 30-g bullet traveling horizontally at 300 m/s strikes a 1.0-kg block which is attached to a ... (Read 122 times)

abarnes · **on:** Jul 29, 2018

A 30-g bullet traveling horizontally at 300 m/s strikes a 1.0-kg block which is attached to a horizontal spring with a force constant of 2000 N/m and rests on a frictionless horizontal surface.

The spring is on the far side of the block and aligned with the direction of travel of the bullet. The bullet becomes embedded in the block and, as a result of the impact, and the block slides against the spring. How far is the spring compressed before it reverses its direction of travel?
A)

0.20 m

B)

0.58 m

C)

1.2 m

D)

0.40 m

E)

0.039 m

Question 2

Two light sources individually provide intensity Io at a point. If the sources are operated at the same time and are coherent but out of phase 30, what is the intensity at that point?

A)

3.7 Io
B)

2.0 Io
C)

3.0 Io
D)

2.8 Io
E)

1.0 Io