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

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

A

2

B

6

C

4.5

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
D
Projection of `(2hati + 6hatj)` on z-axis = `(2hati + 6hatj) . Hatk=0`
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GRB PUBLICATION-VECTORS-OBJECTIVE QUESTIONS
  1. Find the torque of a force vecF= -3hati+hatj+5hatk acting at the poin...

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

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

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

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

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

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

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

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

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

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

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

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

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

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  15. A vector remins unchanged on :

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

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

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

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  19. The angle between the two vectors vecA=5hati+5hatj and vecB=5hati-5hat...

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  20. A paricle starting from the origin (0,0) moves in a straight line in (...

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