### What is its rotational kinetic energy at given rpm

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##### Reference no: EM13544805

A 20-cm diameter circular saw blade has a mass of 0.79kg, distributed uniformly as in a disk.

a) What is its rotational kinetic energy at 4400 rpm?

b) What average power must be applied to bring the blade from rest to 4400 rpm in 3.5s?

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