A wheel with rotational inertia I is mounted on a fixed, fricitonless axle. The angular speed w of the wheel is increased from zero to w_f in a time interval T.

1: What is the average net torque on the wheel during the time interval, T?

a) w_f/T

b)w_f/T^2

c) Iw_f^2/T

d)Iw_f/T^2

e)Iw_f/T

2: What is the average power input to the wheel during this time interval T?

a) Iw_f/2T

b_Iw_f^2/2T

c)Iw_f^2/2T^2

d)I^2w_f/2T^2

e)I^2w_f^2/2t^2