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ally
Junior Member

Cyprus
4 Posts

skeeter

USA
5634 Posts

 Posted - 09/20/2008 :  11:49:59 75 radians of angular displacement is correct.are you familiar with the formula for arc length?s = r s = (20 cm)(75 radians) = 1500 cm = 15 mpower = work/time = (change in rotational kinetic energy)/timerotational kinetic energy = (1/2)Iwwhere I = rotational inertia of the pulley (usually (1/2)Mr since a pulley is normally a solid disk ... for your pulley, I = (1/2)(50 kg)(0.2 m) = 1 kg-m)w (omega) = angular speedP = [(1/2)(1)(6) - 0]/3 = (18 J)/(3 s) = 6 watts
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