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The area of the triangle whose adjacent ...

The area of the triangle whose adjacent sides are : `veca=3hati+hatj+4hatk` and `vecb=hati-hatj+hatk` is :

A

`1/2 sqrt(42)`

B

42

C

`sqrt(42)`

D

`sqrt(21)`.

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MODERN PUBLICATION-VECTORS-Exercise
  1. If (hati,hatj,hatk) are the usual three perpendicular unit vectors, th...

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  2. If theta is the angle between two vectors veca and vecb, then |veca*ve...

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  3. The area of the triangle whose adjacent sides are : veca=3hati+hatj+4h...

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  4. The magnitude of the vector 6hati+2hatj+3hatk is :

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  5. The vector with initial point P(2,-3,5) and terminal point Q(3,-4,7) i...

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  6. The angle between the vectors hati-hatj and hatj-hatk is :

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  7. The value of 'lambda' for which the two vectors : 2hati-hatj+2hatk and...

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  8. If |veca|=8,|vecb|=3 and |vecaxxvecb|=12, then value of veca*vecb is :

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  9. If veca=2hati-hatj+hatk and vecb=-2hati+hatk, then the vector in the d...

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  10. If veca and vecb are two collinear vectors, then which of the followi...

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  11. If vecaxxvecb=|veca||vecb|sin theta hatn, which one is correct ?

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  12. If veca*vecb=-|veca||vecb|, then theta=

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  13. The projection of the vector veca=2hati+3hatj+2hatk on the vector vecb...

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  14. The area of triangle having adjacent sides veca and vecb is :

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  15. The magnitude of : veca=3hati+2hatj is :

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  16. If veca=3hati-hatj+2hatk,vecb=hati-3hatk, then veca*vecb is :

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  17. If veca=hati+2hatj+5hatk,vecb=2hati+3hatj, then the value of vecaxxvec...

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  18. Let the vectors veca and vecb be such that |veca|=3 and |vecb|=(sqrt2)...

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  19. For a unit vector veca if (x-veca)*(x+veca)=12, then |x| is equal to :

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  20. Projection of vector veca on other vector vecb is equal to :

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