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Torque (vec tau) acting on a rigid body ...

Torque `(vec tau)` acting on a rigid body is defined as `vec tau = vec A xx vec L`, where `vec A` is a constant vector and `vec L` is angular momentum of the body. The magnitude of the angular momentum of the body remains same.
`vec tau` is perpendicular to `vec L` and hence torque does not deliver any power to the body.

A

Statement-1 is True, Statement-2 is Ture , Statement -2 is a correct explanation for statement -1.

B

Statement-1 is True, Statement-2 is True , Statement-2 is NOT a correct explanation fro Statement -1.

C

Statement-1 is True, Statement-2 is False.

D

Statement-1 is False, Statement-2 is True.

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • The torque vec tau on a body about a given point is found to be equal to vec A xx vec L where vec A is a constant vector and vec L is the angular momentum of the body about the point. From this its follows that -

    A
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    `vec L` does not change with time.

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