Q. An electric motor rotating a workshop grinding wheel at the rate of 106 rev/min is switched off. Assume the wheel has a stable negative angular acceleration of magnitude 1.50 rad/s2.
How long does it take for the grinding wheel to stop?
Q. On an amusement park ride, passengers are seated in a horizontal circle of radius 7.50m. The seats begin from rest and are regularly accelerated for 21 seconds to a maximum rotational speed of 1.40 rad/s. What is the instantaneous tangential speed of the passengers 15 s after acceleration begins?