Question

A solid cylinder of mass $2 \, kg$ and radius $0.2 \, m$ is rotating about its own axis without friction with an angular velocity of $3 \, rad \, s^{- 1}$ . Angular momentum of the cylinder is

• A. $0.2Js$
• B. $1.12Js$
• C. $0.12 \, J \, s$
• D. $12Js$

Answer 1

Answer: (C)

$L=I\omega =\left(\frac{1}{2} m r^{2}\right)\omega =\frac{1}{2}\times 2\left(0.2\right)^{2}\times 3=0.12 \, J \, s$