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If theta be the angle between the vector...

If `theta` be the angle between the vectors `hati+hatj` and `2hatj+2hatk`, then `theta` is

A

0

B

`pi/4`

C

`pi/2`

D

`pi/3`

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The correct Answer is:
D
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PATHFINDER-VECTOR-I AND VECTOR-II-QUESTION BANK
  1. vecA=2hati+hatj, vecB=2hatj-hatk and vecC=6hati-2hatk. Value of vecA-2...

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  2. The angle between veca and vecb is 0^@ then angle between 2veca and -3...

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  3. If theta be the angle between the vectors hati+hatj and 2hatj+2hatk, t...

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  4. Scalar projection of the vector 2hati+3hatj+2hatk on the vector hati-2...

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  5. If (vecA+vecB) is perpendicular to vecB and (vecA+2vecB) is perpendicu...

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  6. Vector vecA of magnitude 4 units is directed along the positive x-axis...

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  7. If two vectors vecC=vecA+vecB and vecD=vecA-vecB are at right angle to...

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  8. The resultant of two forces vecF1 and vecF2 is P. If vecF2 is reversed...

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  9. The X and Y=component of vecP and 7hati and 6hatj Also, the X and Y-co...

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  10. Two vector vecA=3hati+8hatj-2hatk and vecB=6hati+16hatj+xhatk are such...

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  11. Two vectors vecA and vecB have magnitudes 2 and 2sqrt2 respectively. I...

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  12. (veca-vecb)xx(veca+vecb) is equal to

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  13. The vector vecaxx(vecbxxveca) is

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  14. vecA.(vecAxxvecB) is

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  15. A vector vectorA points vertically downward and vecB points towards no...

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  16. A force vecF=3hatj acts on the road a a point P(1,0,0). Then the torqu...

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  17. The angle between the vector vecA and vecB is 0. The value of the trip...

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  18. If veca and vecb are two vectors then the value of (veca+vecb) xx (vec...

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  19. The velocity of a particle is vecv=6hati+2hatj-2hatk. The component of...

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  20. The value of hatixx(hatixxveca)+hatjxx(hatjxxveca)+hatkxx(hatkxxveca) ...

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