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The torque vec tau on a body about a giv...

The torque `vec tau` on a body about a given point is found to be equal to `vec A x vec L`, where A is a constant vector and L is the angular momentum of the body about that point. From this it follows that

A

`vec (dL)/dt` is perpendicular to `vec L at all instants of time

B

the component of `vec L` in the direction of A does not change with time.

C

the magnitude of L does not change with time

D

`vec L` does not change with time

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