Question

The rate of change of angular speed is constant. What will be the expression for change in angular speed after time dt, if angular acceleration is ‘a’? The initial angular speed is ‘w’.

(a) a*dt

(b) w – a*dt

(c) w + a*dt

(d) There is no change

This question was posed to me in semester exam.

My enquiry is from Kinematics of Rotational Motion about a Fixed Axis in section System of Particles and Rotational Motion of Physics – Class 11

Answer 1

Correct option is (a) a*dt

The explanation: The equation of rotational motion is given by: w = w0 + a*dt, where dt is the time interval. Therefore, the change in angular speed = w – w0 = a*dt.