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A circular plate spins about its own axis at 100 revolutions per minute. Find the linear speed of a point P on the plate located 4.2 cm from the rotation axis.

0.22 m/s
0.44 m/s
2.2 m/s
4.4 m/s

Correct answer: 0.44 m/s

Solution

omega = 2*pi*100/60 = 10.47 rad/s and v = r*omega = 0.042 * 10.47 = 0.44 m/s.

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