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Find the torque of a force vecF= -3hati+...

Find the torque of a force `vecF= -3hati+hatj+5hatk ` acting at the point `vecr=7hati+3hatj+hatk`

A

`12hati - 14hatj + 3hatk`

B

`-14hati + 38hatj - 16hatk`

C

`-12hati + 14hatj - 3hatk`

D

`14 hati - 38hatj + 16 hatk`

Text Solution

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The correct Answer is:
D
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GRB PUBLICATION-VECTORS-OBJECTIVE QUESTIONS
  1. Area of the parallelogram formed by vectors vecA = hati + 2hatj+ 4 ...

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  2. Can a flight of a bird be an example of composition of vectors ?

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  3. Find the torque of a force vecF= -3hati+hatj+5hatk acting at the poin...

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  4. vecR is the resultant of vecA and vecB . vecR is inclined to vecA a...

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  5. Projection of 2hati + 6hatj on Z-axis is :

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  6. vecR is the resultant of vecA and vecB . vecR is inclined to vecA a...

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  7. hata, hatb and hatc are unit vectors. If the hata +hatb = hatc, th...

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  8. Diagonals of a parallelogram are respresented by vectors vecA = 5ha...

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  9. A particle is moving on a cicular path of radius 'R' . As it moves ...

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  10. If vec(A) makes an angle alpha, beta and gamma from x,y and z axis res...

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  11. Magnitudes of vectors vecP, vecQ and vecR are equal, If vecP + vecQ+...

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  12. A vector vecA is rotated through angle theta about its tail. Chan...

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  13. A particle is moving on a circular path with a constant speed 'v'. ...

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  14. Linear momentum of an object can be expressed as vecP= (4 cos t)ha...

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  15. vecA and vecB are two vectors. (vecA + vecB) xx (vecA - vecB) can...

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  16. Vertices of a triangle are A(3, 1, 2), B(1, -1, 2) and C(2, 1, 1). ...

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  17. A vector remins unchanged on :

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  18. The velocity of a particle is v=6hati+2hatj-2hatk The component of the...

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  19. A particle is displaced from a position 2hati-hatj+hatk (m) to another...

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  20. Two vectors vecP and vecQ that are perpendicular to each other are ...

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