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The values of x for which the angle betw...

The values of x for which the angle between the vectors `bara = xbari -3barj-bark and 2xbari+xbarj-bark` is acute, and the angle between the vector `barb` and the axis of ordinates is obtuse, are

A

`xgt0`

B

`xlt0`

C

x=0

D

`xge0`

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The correct Answer is:
B
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AAKASH SERIES-DOT PRODUCT OF TWO VECTORS-PRACTICE EXERCISE
  1. If the angle between the vectros (x,3,-7) and (x,-x,4) is acute, then ...

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  2. The value of c so that all real 'x' the vectors cxbari - 6barj+3bark, ...

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  3. The values of x for which the angle between the vectors bara = xbari -...

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  4. The unit vector in ZOX-plane making angles 45^(@) and 60^(@) " respect...

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  5. If, in a right angled triangle ABC, the hypo tenus AB =p, then bar(AB...

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  6. Let bara= 4bari-3barj+5bark . A vector b is coplanar with bari, barj ...

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  7. The component of 5bari-3barj+bark " on " 2bari+barj+2bark is

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  8. If the projection of the vector bari+barj+bark " on the vector " abari...

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  9. Let bara= 2bari+3barj+k,barb = 4bari+barj and bari = bari - 3barj-bark...

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  10. Let bara =2bari+3barj-bark, barb=bari-2barj+3bark. bare is a vector p...

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  11. If bare(1),bare(2) and bare(3) are non-coplanar unit vectors and alp...

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  12. In DeltaABC, " if " BC = a, CA = b and AB = C, " then what is the valu...

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  13. If a,b,c,d are the vertices of a rhombus, then

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  14. The angle between the diagonals of a parallelogram with the vectors 2b...

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  15. If bar(AB)=2bara+barb and bar(AD) = bara-2barb " where " absbara=1, ab...

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  16. bara=bari-barj+3bark , barb =3bari-5barj+6bark. " the magnitude of the...

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  17. The projection of vector bari+barj+bark " on the line whose vector equ...

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  18. Let bara =bari+2barj+bark, barb=bari-barj+bark, barc=bari+barj-bark. A...

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  19. The foot of the perpendicular drawn from a point with position vector ...

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  20. In the Parallelogram ABCD, bar(AC)^(2)-bar(BD)^(2) =

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