An iron disk has a radius of 0.625 m and a mass of 217 kg. The disk is mounted on its axis so that it is free to spin. How much force is required if the force is applied at a distance 19.5 cm from the axis of rotation?

Answer 1

I = (1/2)m r^2

F (.195) = I alpha

since you did not say what the angular acceleration alpha is, I can not do anything more for you

Answer 2

α = 1.00 rad/s2

Answer 3

well, then you have your answer
F = (1/2) 217 (.625)^2 / .195