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A 18 cm -diameter circular saw blade has a mass of 0.90 kg , distributed uniformly...

A 18 cm -diameter circular saw blade has a mass of 0.90 kg , distributed uniformly as in a disk.

a.)

What is its rotational kinetic energy at 3400 rpm ?

Express your answer using two significant figures.

b.)

What average power must be applied to bring the blade from rest to 3400 rpm in 3.5 s ?

Express your answer using two significant figures.

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