# Question

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 off? Explain why.
(b) What is its angular speed at the lower temperature?

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