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dislect

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this is not a question from Hw its pure interest.

1.lets say i have an electric motor with a shaft radius r lengh L, and at its end there is a metal disk with radius R and thickness b. if the motor supplies torque τ what would be the momentum on the disk?

i was thinking that i the motor gives momentum τ on a shaft then its gives a force of F1=τ/r and so the momentum of the disk is M1=τ/r * (R-r) ? please correct me

2. using the same data, when a motor is given and it is suppose to supply 3000 RPM under no load, how can i calculate the reduce in RPM if it is loaded by a full metal disk distanced L from the motor on its shaft?

thanks a lot for your help