A Ferris wheel rotates because a motor exerts a torque on thewheel. The radius of the London Eye is 67.5 m and its mass is 1.90x 10^6 kg. The cruising angular speed of the wheel is 3.50 x10^–3 rad/s.
(a) How much work does the motor need to do to bring the stationary wheel up to cruising speed?
[Hint: Treat the wheel as a hoop.]
(b) What is the torque (assumed constant) themotor needs to provide to the wheel if it takes 20.0 s to reach thecruising angular speed?