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A motor spins a disk (Idisk = 25 kg*m2) with a torque of 38 N*m, and...

A motor spins a disk (Idisk = 25 kg*m2) with a torque of 38 N*m, and a 18 N frictional force acts on the disk at a radius of 1.4 m. Attached to the disk at a radius of 2.1 m is a 2.9 kg mass. What is the magnitude of the net torque in N*m of the system?

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