Physics problem

PHYSICS 1111 – Fall 2020 Name____________________________________

Quiz 14

Moment of inertia of a solid disk: I = ½ MR2

Moment of inertia of a solid sphere: I = 2/5 MR2

Moment of inertia of a ring: I = MR2

Moment of inertia of a hollow sphere: I = 2/3 MR2

1. (4 pts) Consider a 5.0 kg solid disk with a 2.0 m radius, which is initially spinning on its central axis in a counterclockwise direction with an angular speed of 5.0 rad/s. What is the angular

momentum of this spinning disk?

2. (4 pts) Now, a second object, which is not initially rotating, is dropped on top of the first and they stick together. The final angular speed of the two objects stuck together is 2.0 rad/s in the

same counterclockwise direction. What is the magnitude of the moment of inertia of the second

object?

3. (2 pts) What was the initial rotational kinetic energy of the spinning disk in question 1. ? This means before the object from question 2 was dropped.