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Question: Answered & Verified by Expert
If there is a change of angular momentum from 1J-s to 4J-s in 4 second, then the torque is
PhysicsRotational MotionMHT CETMHT CET 2020 (16 Oct Shift 1)
Options:
  • A $1 \mathrm{~J}$
  • B $\left(\frac{3}{4}\right) \mathrm{J}$
  • C $\left(\frac{5}{4}\right) \mathrm{J}$
  • D $\left(\frac{4}{3}\right) \mathrm{J}$
Solution:
1568 Upvotes Verified Answer
The correct answer is: $\left(\frac{3}{4}\right) \mathrm{J}$
$\mathrm{L}_{1}=1 \mathrm{~J} \mathrm{~s} \quad \mathrm{~L}_{2}=4 \mathrm{~J} \mathrm{~s}$
$\mathrm{t}=4$
$\tau=\frac{4-1}{4}=\frac{3}{4} \mathrm{~J}$

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