PHYSICS · Multi-part · AP · Physics 1: Algebra-based · Torque and Rotational Dynamics · Torque and Rotational Dynamics
Problem
A grinding wheel is rotating freely at 120rads−1. The driving power is cut off and the wheel is observed to come to rest after turning through 20 complete revolutions. Assume the angular deceleration to be uniform.
(i) Calculate the magnitude of the angular deceleration.
(ii) Determine the time taken by the wheel to come to rest.
(iii) Find the angular speed of the wheel after it has completed the first 5 revolutions during the slowing process.