Home / Unit-4 Dynamics-2 / Question
MCQ
A rotating body conserves its angular momentum L = mvr. If the radius of rotation decreases to half with angular momentum conserved, its speed becomes:
Unit-4 Dynamics-2
A Half
B Four times
C One quarter
D Two times
Explanation

Since L = mvr is constant, halving r doubles the speed v.

Related MCQs

The mathematical expression of centripetal acceleration is:
Unit-4 Dynamics-2 View
Banking of roads is an application of:
Unit-4 Dynamics-2 View
A car of mass 800 kg travels on a banked road with tan(theta) = 0.5 and a turn radius of 20 m (g = 10 m/s^2). The speed at which it can turn safely without depending on friction is:
Unit-4 Dynamics-2 View
The centripetal acceleration of a body moving at 5 m/s in a circle of radius 5 m is:
Unit-4 Dynamics-2 View
Centripetal force changes the ______ of the body but not its ______.
Unit-4 Dynamics-2 View
A body of mass 2 kg moves in a circle of radius 2 m with a speed of 4 m/s. The centripetal force on it is:
Unit-4 Dynamics-2 View