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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

`14hati-38hati+16hatk`

B

`4hati+4hatj+6hatk`

C

`21hati+4hatj+4hatk`

D

`-14hati+34hatj-16hatk`

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The correct Answer is:
A
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ERRORLESS -VECTORS-Exercise
  1. The position of a particle is given by vecr=(hati+2hatj-hatk) and mome...

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  2. Two vector A and B have equal magnitudes. Then the vector A+B is perpe...

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

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  4. the value of (vecA+vecB)xx(vecA-vecB) is

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  5. If vecA and vecB are perpendicular vectors and vector vecA=5hati+7hatj...

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  6. A body, under the action of a force vec(F)=6hati -8hatj+10hatk , acqui...

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  7. Area of a parallelogram formed by vectors (3hati-2hatj+hatk)m and (hat...

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  8. The position vectors of radius are 2hati+hatj+hatk and 2hati-3hatj+hat...

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  9. What is the value of linear velocity, if vecomega=3hati-4hatj+hatk and...

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  10. Dot product of two mutual perpendicular vector is

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  11. When vecA.vecB=-|A||B|, then

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  12. If |vecAxxvecB|=sqrt(3) vecA.vecB, then the value of |vecA+vecB| is

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  13. A force vecF=3hati+chatj+2hatk acting on a particle causes a displacem...

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  14. A force vecF=(5hati+3hatj)N is applied over a particle which displaces...

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  15. If a vector vec(A) is parallel to another vector vec(B) then the resul...

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  16. P, Q and R are three coplanar forces acting at a point and are in equi...

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  17. P, Q and R are three coplanar forces acting at a point and are in equi...

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  18. If a body is in equiliburium under a set of non-collinear forces, then...

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  19. How many minimum number of coplanar vector having different magnitudes...

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  20. As shown in figure the tension in the horizontal cord is 30 N. The wei...

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