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A grinding stone of radius 10 cm ( I=0,2 kg*m^2) turns at a rate of 200 RPM. A tool is leaned against the circumference of the grinding stone with a force of 50N of radial direction. The kinetic coefficient of friction is equal to 0,6.

(A) What power is necessary to maintain the grinding stone in rotation at a constant angular velocity?

The answer is supposed to be 62,8 W and I know I have to use torque but I really don't know how to do it