Q150 / 150 · MHT CET 2020 (15 Oct Shift 1) · Physics
A torque of $50 \mathrm{Nm}$ acts on a body for 8 second which is initially at rest. The change
in its angular momentum is
- Correct answerA$400 \mathrm{kgm}^{2} / \mathrm{s}$
- B$600 \mathrm{kgm}^{2} / \mathrm{s}$
- C$1000 \mathrm{kgm}^{2} / \mathrm{s}$
- D$800 \mathrm{kgm}^{2} / \mathrm{s}$
Solution
$\tau=50 \mathrm{Nm}$ for 8 second initially at rest
$\vec{L}=\vec{\tau} \cdot t \quad$ for constant $\vec{L}$ $\vec{\tau}$
$|\vec{L}|=400 \mathrm{~kg} \mathrm{M}^{2} / \mathrm{S}.$
Hence, the correct answer is option: 'A'.