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Let vec(F) be the force acting on a part...

Let `vec(F)` be the force acting on a particle having position vector `vec(r )` and `vec(tau)` be the torque of this force about the origin. Then

A

`vec(r ).vec(F) = 0 and vec(r ). Vec(tau) != 0`

B

`vec(r ). Vec(tau) != 0 and vec(F). Vec(tau) = 0`

C

`vec(r ). Vec(tau) != 0 and vec(F) . Vec(tau) != 0`

D

`vec(r ).vec(tau) = 0 and vec(F) . Vec(tau) = 0`

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The correct Answer is:
D
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AAKASH SERIES-WORK, POWER & ENERGY -EXERCISE - I
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  4. The area under a .force - displacement. curve gives :

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