Question

A constant torque acting on a uniform circular wheel changes its angular momentum from A to 4A in 4sec. The torque acted on it is

Answer 1

Change in angular momentum ΔL=L

f

−L

i

=4A

o

−A

o

=3A

o

Time taken ΔT=4 s

Magnitude of torque τ=

ΔT

ΔL

=

4

3A

o