per second and has a mass of 84 kilograms.
A: What is his momentum when he’s traveling at that speed?
B: What is his kinetic energy when he’s traveling at that speed?
C: How much force is required if he starts at rest and it takes him half a second to reach
that speed?
2 (10 points): A solid sphere and a hollow sphere roll down a one-meter ramp inclined at 45°.
Both have a mass of 0.75 kilograms and a radius of 7 centimeters. The solid sphere has a moment
of inertia of 2𝑀𝑅
2
5
while the hollow sphere has a moment of inertia of 2𝑀𝑅
2
3
. Both spheres start
from rest, travel the same distance, and roll simultaneously. Which one reaches the bottom of the
ramp first? Explain your reasoning
(15points): A sixteen-ton weight is suspended seven feet in the air. (16 tons = 14,515
kilograms and 7 feet = 2.1336 meters)
A: What is the weight’s potential energy?
B: How much work was done to raise the weight?
C: If the rope breaks, how fast will the weight be going when it hits the ground?