A flywheel is subjected to a constant clockwise angular acceleration for 1.5 s
PHYSICS · Single correct · CBSE · Physics · System of Particles and Rotational Motion · System of Particles and Rotational Motion
Problem
A flywheel is subjected to a constant clockwise angular acceleration for 1.5 s, after which the net torque becomes zero and the flywheel coasts at constant angular speed. Which statement best describes the angular velocity ω and angular displacement θ at the instant t=1.5s?
(a) Because the torque stops abruptly, ω drops instantaneously, so ω is discontinuous while θ changes smoothly.
(b) Zero net torque means no rotation, so ω=0 at 1.5s even though the wheel has already turned through a finite angle.
(c) Both ω and θ remain continuous; each has a single definite value at t=1.5s.
(d) At 1.5s the wheel has just started turning, so θ=0 while ω has reached its greatest value.