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Physics 207 WebPages - Fall 1999
Problem 10

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Problem 10

Problem 10 (Problem 79 in Textbook)

A 32.0 kg wheel, essentially a thin hoop with radius 1.20 m, is rotating at 280 rev/min. It must be brought to a stop in 15.0 s.

(a) How much work must be done to stop it?

Solution:

First, we have to find the rotational inertia of the body. Then plugging the rotational inertia equation from Table 11-2 into the rotational kinetic energy equation, we obtain the following setup.





(Answer)

(b) What is the required power?

Solution:

Using the power equation, we obtain the following setup.


(Answer)

 

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