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Torque of a force F = -3hati + hatj +5ha...

Torque of a force F = `-3hati + hatj +5hatk` acting at the point r = `7hati+3hatj+hatk` is

A

`14hati - 38hatj +16hatk`

B

`4hati + 4hatj +6hatk`

C

`-14hati + 38hatj - 16hatk`

D

`-2hati + 3hatj +5hatk`

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The correct Answer is:
A
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BINA LIBRARY-SYSTEM OF PARTICLES AND ROTATIONAL MOTION-EXERCISE
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  2. If the earth suddenly contracts to one third of its present radius, ho...

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  4. The radius is 2hati + hatj +hatk, While linear momentum is 2hati +3hat...

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  8. A body rolls down an inclined plane. If its K.E of rotational motion i...

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  9. Two rings have their moments of inertia in ratio 2 : 1 and their diame...

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  10. the motion of planet in solar system is an example of

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  12. A 5 kg stationary bomb is exploded in three parts masses 1 : 1 : 3 res...

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  13. When a steady torque acts on a body it

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  15. Moment of inertia of a body comes into play

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  16. The angular momentum of a body is defined as the product of

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  17. A mass M is moving with a constant velocity parallel to x axis. Its an...

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  18. When torque acting upon a system is zero, which of the following will ...

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