College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

Exercise 92

To start her lawn mower, Julie pulls on a cord that is wrapped around a pulley. The pulley has a moment of inertia about its central axis of I = 0.550 kg · m 2 and a radius of 5.00 cm. There is an equivalent frictional torque impeding her pull of f = 0.430 m · N. To accelerate the pulley at = 4.55 rad/s 2 , (a) how much torque does Julie need to apply to the pulley (b) How much tension must the rope exert