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Let vec a= hat i+2 hat j+ hat k , vec b...

Let ` vec a= hat i+2 hat j+ hat k , vec b= hat i- hat j+ hat ka n d vec c= hat i+ hat j- hat kdot` A vector in the plane of ` vec aa n d vec b` whose projectionof `c` is `1//sqrt(3)` is `4 hat i- hat j+4 hat k` b. `3 hat i+ hat j+3 hat k` c. `2 hat i+ hat j-2 hat k` d. `4 hat i+ hat j-4 hat k`

A

`4hat(i)-hat(j)+4hat(k)`

B

`4hat(i)+hat(j)-4hat(k)`

C

`2hat(i)+hat(j)+2hat(k)`

D

None of these

Text Solution

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The correct Answer is:
A
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ARIHANT MATHS-PRODUCT OF VECTORS-Exercise (Questions Asked In Previous 13 Years Exam)
  1. If veca, vecb, vecc are unit vectors such that veca+vecb+vecc=0, find...

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  2. Let A be vector parallel to line of intersection of planes P1 and P2. ...

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  3. Let vec a= hat i+2 hat j+ hat k , vec b= hat i- hat j+ hat ka n d vec...

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  4. Find the 7th term of GP if the first term is 7 and common ratio is 2.

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  5. The unit vector which is orthogonal to the vector 3hati + 2hatj + 6hat...

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  6. The value of a so that the volume of parallelepiped formed by hat i...

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  7. If vec a=( hat i+ hat j+ hat k), vec a. vec b=1a n d vec axx vec b= h...

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  8. Let v=2hat(i)+hat(j)-hat(k) and w=hat(i)+3hat(k). If hat(u) is unit v...

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  9. If veca and vecb are two unit vectors such that veca + 2vecb and 5 vec...

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  10. Let a= 2hat(i) +hat(j) -2hat(k) , b=hat(i) +hat(j) and c be a vecto...

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  11. If [axxb bxxc c xxa]=lambda[abc]^(2), then lambda is equal to

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  12. If a and b1 are two unit vectors such that a+2b and 5a-4b are perpendi...

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  13. Let ABCD be a parallelogram such that vec A B= vec q , vec A D= vec p...

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  14. veca =1/sqrt(10)(3hati + hatk) and vecb =1/7(2hati +3hatj-6hatk), then...

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  15. The vectors vec a and vec b are not perpendicular and vec c and v...

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  16. If the vectors ahat(i)+hat(j)+hat(k), hat(i)+bhat(j)+hat(k), hat(i)+ha...

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  17. Let veca =hatj-hatk and vecc =hati-hatj-hatk. Then the vector b satisf...

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  18. If the vectors veca=hati-hatj+2hatk.vecb=2hati+4hatj+hatk and vec c=la...

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  19. If vecu, vecv, vecw are non -coplanar vectors and p,q, are real numbe...

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  20. The vector vec a=""alpha hat i+2 hat j+""beta hat k lies in the pl...

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