While exercising in a fitness center, a man lies face down on a bench and lifts a weight with one lower leg by contracting the muscles in the back of the upper leg. the weight has mass 13.5 kg, and is a distance of 28.0 cm from the knee joint. the moment of inertia of the lower leg is 0.900 kg⋅m2 , the muscle force is 1510 n , and its effective perpendicular lever arm is 3.60 cm. find the magnitude of the angular acceleration of the weight.

During the experiment if you could triple the breakaway magnetic force with all other quantities left unchanged, what is the new value for the critical velocity if it was v0 (initial velocity), initially? (b) now if you halved the radius with all other quantities left unchanged, what is the new critical velocity if it was v0 (initial velocity), initially? (c) if during the experiment, critical velocity quadrupled with all other quantities left unchanged, what is the new breakaway force if its magnitude was initially f0,?