The turntable in a microwave oven has a moment of inertia of 0.040 kg*m2 and is rotating once every 4.0 s.

The turntable in a microwave has a moment of inertia of 0.040 kg*m^2 and rotates once every 4.0 s. What is its kinetic energy?

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1 Answer

KE=½I⍵²=½0.040⍵²=0.020⍵².

1rev in 4 secs, ¼rev in 1 sec=π/2 radians/sec.

KE=0.020(π/2)²=0.0493 joules approx.

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