# Rotational Kinematics: Kinetic energy of system; weight fallen; angular acceleration

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A 15 kg uniform disk of radius R = 0.25 m has a string wrapped around it, and a m = 5 kg weight is hanging on the string. The system of the weight and disk are initially at rest. When the 5 kg weight is released, it moves down and the disk rotates.

Consider the point when the 5 kg weight is moving with a speed of 1.3 m/s.

a) What is the kinetic energy of the entire system?

b) How far has the weight fallen?

c) What is the angular acceleration of the disk?

https://brainmass.com/physics/acceleration/determining-kinetic-energy-weight-fallen-angular-acceleration-9508

#### Solution Summary

This solution provides assistance determining the kinetic energy of a system, how far the weight has fallen, and the angular acceleration of the disk.

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