Asked Nov 6, 2019

A 1.1-kg 20-cm-diameter solid sphere is rotating about its diameter at 73 rev/min.

(a) What is its kinetic energy?

(b) If an additional 5.0 mJ of energy are supplied to the rotational energy, what is the new angular speed of the ball?


Expert Answer

Step 1


Total kinetic energy is the sum of rotational and translational kinetic energies.


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to tal 10

Step 2

Radius is half of the diameter. It is given that the diameter is 20 cm. So, the radius is 10 cm. Substituting the values,


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'0.105 rad/sec m 73rev/min (1.1kg) 10 cm 10 Kotal 100 cm rev/min 0.452J

Step 3

Answer: 0.4...

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