Q. Calculate the angular momentum of a body whose rotational energy is $10\ Joule$. If the angular momentum vector coincides with the axis of rotation and its moment of inertia about this axis is $8 \times 10^{- 7}\ kg\ m^{2}$
A) $4 \times 10^{- 3}\ kg\ m^{2}/s$
B) $2 \times 10^{- 3}\ kg\ m^{2}/s$
C) $6 \times 10^{- 3}\ kg\ m^{2}/s$
D) None of these
Explanation
(a) $L = \sqrt{2EI} = \sqrt{2 \times 10 \times 8 \times 10^{- 7}} = 4 \times 10^{- 3}kg\ m^{2}/s$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.