# Kinetic energy in rotating objects.

by Duely Cack
Tags: diameter, kinetic energy, math, rotation
 P: 7 1. A 75-g phonograph album of 30-cm diameter spins at 33.3 rpm. What is its kinetic energy? 2. 1/2mv2 3. well i think that kinetic energy is 1/2mv2 so is it like that but instead of v you put in the 33.3 rpm. like 1/2(75)(33.3)2 maybe?
 P: 328 $$K_e = \frac{1}{2}I\omega^2$$ You have to use omega as radians per second, mass has to be in kilograms.

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