Physics - needs help with (c)

(a) Calculate the angular momentum, in kg . m /s, of an ice skater spinning at 6.00 rev/s given his moment of inertia is 0.350 kg . m. 13.195 kg . m-/'s 1.45 rev/5. (b) He reduces his rate of spin (his angular velocity) by extending his arms and increasing his moment of inertia. Find the value of his moment of inertia, in kg . m, if his angular velocity drops to 1.448 kg . m2 (c) Suppose instead he keeps his arms in and allows friction with the ice to slow him to 3.00 rev/s. What average torque, in N m, was exerted if this takes 22.0 seconds? (Indicate the direction with the sign of your answer. Assume that the skater's rotation is in the positive direction.) 0.3 X Consider the angular momentum principle in its general form. Check the values you use for the known variables. N . m