Physics #20?
A thin hoop with a radius of 10 cm and a mass of 3.0 kg is rotating about its center with an angular speed of 3.5 rad/s. What is its kinetic energy?
a. 0.18 J
b. 0.092 J
c. 1.05 J
d. 0.53 J
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Since the hoop is thin, you can just treat it as a mass travelling at a particular speed and use the normal formula for kinetic energy. Work out the speed of any point on the ring in metres per second and use this as the speed.