A plot of angular momentum of a rigid body (along y axis) about an axis with time (along x axis) gives rise to a straight line, whose equation is given by y = 3x+1. Find the torque acting on the body

8 N-m

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3 N-m

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30 N-m

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0.3 N-m

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Solution

The correct option is C 3 N-m
We know that torque= dL/dt. Integrating, we get $L = L_{0} + τ t$ .
This equation resembles the equation of a straight line y= mx +C. Comparing with y=3x+1, we get the torque = 3 N-m
The correct option is (b)

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