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A copper disk at 850 degrees celsius rotating about its axis with an angular speed of...

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Physics

A copper disk at 850 degrees celsius rotating about its axiswith an angular speed of 25 rad/s in the outer space. As the diskradiates infrared light, its temperature falls to 20 degreescelsius. No external torque acts on the disk. Does the angularspeed of the disk change as it cools?

Answer & Explanation Solved by verified expert
3.8 Ratings (717 Votes)
YESAs the temperature of the copper disk decreases so does itsdiameter Now as the diameter decreases its moment of inertia alsodecreases But for    See Answer
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