   Chapter 10, Problem 67AP

Chapter
Section
Textbook Problem

Following a collision in outer space, a copper disk at 850°C is rotating about its axis with an angular speed of 25.0 rad/s. As the disk radiates infrared light, its temperature falls to 20.0°C. No external torque acts on the disk. (a) Does the angular speed change as the disk cools? Explain how it changes or why it does not. (b) What is its angular speed at the lower temperature?

(a)

To determine
The change in angular speed of the disc.

Explanation

Formula to calculate the angular momentum is,

L=Iω

• I is the moment of inertia
• ω is the angular speed.

As the disc cools, the radius of the disc decreases

(b)

To determine
The angular speed at the lower temperature.

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