Question

If a body of moment of inertia $2$kg $m^2$ revolves about its axis making $2$ rotations per school, then its angular momentum(in Js) is:

• A. $2\pi$
• B. $4\pi$
• C. $6\pi$
• D. $8\pi$
• E. $10\pi$

Answer 1

The correct option is D $8\pi$

Given,
Moment of inertia of body $I=2kg{m}^2$
Rotation of body in one second $f=2$ rps
We know that,
Angular momentum $L=l\omega$
$L=2\times 2\pi f$
$L=2\times 2\pi \left(2\right)$
$L=8\pi Js$.