# Introductory Moment of Inertia and Rotational Kinetic Energy Problem

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Three 20.0-gram masses are 9.4 cm from an axis of rotation and rotating at 152 revolutions per minute. What is the moment of inertia of the three-object system? The strings holding the masses are of negligible mass. Rotational Kinetic Energy is also solved for and correct units are determined. Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:02 Demonstration

0:14 Translating the problem

0:57 Solving the problem

2:40 Moment of Inertia and angular velocity

3:35 Rotational Kinetic Energy

4:04 Fixing the units

6:27 Solving for joules

7:17 Comparing to Gravitational Potential Energy

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