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[answered] A motor spins a disk (I disk = 25 kg*m 2 ) with a torque of


1.A motor spins a disk (Idisk= 25 kg*m2) with a torque of 40 N*m, and a 18 N frictional force acts on the disk at a radius of 1.6 m. Attached to the disk at a radius of 1.9 m is a 8 kg mass. What is the magnitude of the net torque in N*m of the system?

2.A 88 kg object is in a circular orbit around a 43 kg object at a distance of 5 meters. What is the magnitude of the tangential velocity in m/s of the 88-kg object in its orbit?
Q1.

 

magnitude of torque due to a force = | r x F |

 

Net torque = | (1.6 m x 18 N) ? 1.9

 

= | 28.8 ? 1.9 | = 26.9 N m

 

Q2.

 

We know centripetal acceleration = gravitational acceleration

 

v2/r = GM/r2...

 


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