Part A: Two objects collide head on. Assume they have equal masses but unequal v
ID: 1567174 • Letter: P
Question
Part A:
Two objects collide head on. Assume they have equal masses but unequal velocities, such that the one coming in from the right is moving at 94.97 m/s toward the left, and the one coming in from the left is moving at 39.99 m/s toward the right.
After the collision, what is the velocity of the one that came in from the left? (Use + to the right and - to the left to distinguish direction in your answer.)
Give your answer in m/s.
Part B:
What is the moment of inertia of a disk 6.87 meters in radius of mass 16.91 kg rotating about its center?
Give your answer in kg-m2.
Explanation / Answer
They have equal masses = m
v1 = - 94.97 m/s
v2 = + 39.99 m/s
When two bodies of equal masses suffer one-dimensional elastic collision, they interchange their velocities !!
Velocity of ball that came in from left = - 94.97 m/s
(B)
Moment of inertia of a disk, I = 1/2 * m * r^2
I = 1/2 * 16.91 * 6.87^2
I = 399 kg m^2