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If x=3i-6j-k, y=i+4j-3k" and "z=3i-4j-12...

If `x=3i-6j-k, y=i+4j-3k" and "z=3i-4j-12k`, then the magnitude of the projection of `x times y` on z is

A

14

B

`-14`

C

12

D

15

Text Solution

Verified by Experts

The correct Answer is:
B
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ML KHANNA-ADDITION AND MULTIPLICATION OF VECTORS -Problem Set (3) (MULTIPLE CHOICE QUESTIONS)
  1. If a.b = b.c = c.a = 0, then a.(bxxc)=

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  2. For non-coplanar vectors a, b and c, abs((a times b)*c)=abs(a) abs(b) ...

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  3. If x=3i-6j-k, y=i+4j-3k" and "z=3i-4j-12k, then the magnitude of the p...

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  4. IF a,b,c are non-coplanar vectors, then |{:(a.a,,a.b.,,a.c),(b.a,,b....

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  5. a,b,c are unit vectors such that aand b are mutualy perpendicular and ...

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  6. If a,b and c are three non-coplanar vectors, then the scalar product o...

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  7. If a, b and c are non-zero vectors such that a times b=c, b times c=a ...

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  8. a =2i-j+k, b=i+2j-3k, c=3i+lambdaj+5k and if these vectors be coplanar...

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  9. The position vectors of the points A,B,C,D are vec(3i)-vec(2j)-veck, v...

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  10. The value of lambda for which the points L(1,0,3), M(-1,3,4),N(1,2,1) ...

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  11. If veca lies in the plane of vectors vecb and vecc, then which of the ...

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  12. IF r.a = 0, r. b = 0 and r. c= 0 for some non-zero vector r. Then, the...

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  13. If a, b,c are non-coplanar vectors such that r.a = r.b = r.c =0, then

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  14. Blank,

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  15. If |[a, b, c], [a^(2), b^(2), c^(2)], [a^(3)+1, b^(3)+1, c^(2)+1]|=0 a...

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  16. If the vectors ai + j + k , i + bj + k and i + j + ck, where a, b, c n...

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  17. Another form (1+a)/(1-a) + (1+b)/(1-b) + (1 +c)/(1-c) =

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  18. If the vectors ai +j + k , i-bj+k, i+j-ck are co-planar, then abc + 2 ...

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  19. If the vector ai+j+k,i+bj+k and i+j+ck are coplanar, then :

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  20. Let a,b,c be distinct non-negative numbers. If the vectors ahati+ahatj...

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