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## Homework Statement

Motor running, brakes applied. how much heat in joules will be dissipated?

mass 250 kg

diameter 30 cm

3000 rpm

torque 120 N-m

## Homework Equations

W=1/2 *I *w

^{2}

## The Attempt at a Solution

I keep going the route of:

(1)/(2)*250*.3*315

1*125*.3*315

125*.3*315

37.5*315

11812.5 J

Can anyone show me what I am doing wrong?