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If veca and vecb are two unit vectors su...

If `veca` and `vecb` are two unit vectors such that `veca+2vecb` and `5veca-4vecb` are perpendicular to each other, then the angle between `veca` and `vecb` is

A

`45^(@)`

B

`60^(@)`

C

`cos^(-1)(1//3)`

D

`cos^(-1)(2//7)`

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The correct Answer is:
B
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MOTION-VECTOR -EXERCISE - 4 ( LEVEL-II)
  1. Let veca=hati-hatk, vecb=xhati+hatj+(1-x)hatk and vecc=yhati+xhatj+(1+...

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  2. Let vec A(t) = f1(t) hat i + f2(t) hat j and vec B(t) = g(t)hat i+g2(...

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  3. If veca and vecb are two unit vectors such that veca+2vecb and 5veca-4...

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  4. Let vecV=2hati+hatj-hatk and vecW=hati+3hatk. It vecU is a unit vector...

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  5. The value of a so that the volume of the paralelopiped formed by hati+...

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  6. A unit vector int eh plane of the vectors 2hati+hatj+hatk, hati-hatj+h...

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  7. If veca=veci+vecj+veck, veca.vecb=1 and vecaxxvecb=vecj-veck, then vec...

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  8. If veca,vecb,vecc,vecd are four distinct vectors satisfying the condit...

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  9. Let veca=hati + 2hatj +hatk, vecb=hati - hatj +hatk andvecc= hathatj-h...

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  10. Let vecA be a vector parallel to the of intersection of planes P1 and ...

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  11. The number of distinct values of lamda, for which the vectors -lamda^(...

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  12. Let veca, vecb ,vecc be unit vetors such that veca + vecb + vecc = ve...

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  13. Assertion: vec(PQ)xx(vec(RS)+vec(ST))!=0, Reason : vec(PQ)xxvec(RS)=ve...

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  14. The edges of a parallelopiped are of unit length and are parallel to n...

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  15. Lelt two non collinear unit vectors hata and hatb form and acute angle...

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  16. If veca,vecb,vecc and vecd are unit vectors such that (vecaxxvecb).(ve...

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  17. Let P, Q, R and S be the points on the plane with position vectors -2h...

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  18. If veca and vecb are vectors in space given by veca=(hati-23hatj)/(sqr...

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  19. Let veca=hati + hatj +hatk,vecb=hati- hatj + hatk and vecc= hati-hatj...

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  20. The vectors which is/are coplanar with vectors hati+hatj+2hatk and hat...

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