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If a vector 2hat(i)+3hat(j)+8hat(k) is p...

If a vector `2hat(i)+3hat(j)+8hat(k)` is perpendicular to the vector `4hat(j)-4hat(i)+alpha hat(k)`. Then the value of `alpha` is

A

`-(1)/(2)`

B

`(1)/(2)`

C

1

D

-1

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The correct Answer is:
A
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TARGET PUBLICATION-SCALARS AND VECTORS-Competitive Thinking
  1. The magnitude of the component of the vector 2hat(i)+3hat(j)+hat(k)" a...

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  2. vec(A) and vec(B) are two vectors given by vec(A)=2hat(i)+3hat(j) ...

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  3. If a vector 2hat(i)+3hat(j)+8hat(k) is perpendicular to the vector 4ha...

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  4. The vector vec(P)= ahat(i)+ahat(j)+3hat(k) and vec(Q)= ahat(i)-2hat(j)...

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  5. Three vector vec(A)=ahat(i)+hat(j)+hat(k) , vec(B)=hat(i)+bhat(j)+hat(...

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  6. If Vectors vec(A)= cos omega hat(i)+ sin omega hat(j) and vec(B)=(cos)...

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  7. Consider two vector vec(F1)=2hat(j)+5hat(k)and vec(F2)=3hat(j)+4hat(k)...

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  8. A particle moves from (1,0,3) to the point (-3,4,5), when a force vec(...

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  9. A force (4hat(i)+hat(j)-2hat(k)) ms^(-1) The power exerted is

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  10. A body of mass 1 kg begins to move under the action of a time dependen...

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  11. When vec(A)*vec(B)=-|vec(A)||vec(B)|, then

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  12. The angle between the two vectors, (vec(A)=3hat(i)+4hatj+5hat(k)) and ...

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  13. The angle theta between the vector vec(p)=hat(i)+hat(j)+hat(k) and uni...

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  14. Angle between the vectors (hat(i)+hat(j))and (hat(j)-hat(k)) is

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  15. A particle moves in the x-y plane under the action of a force vecF suc...

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  16. In a triangle ABC, the sides AB and AC represented by the vector 3hat(...

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  17. In a clockwise system :-

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  18. For vectors vec(A) and vec(B) making an angle theta which one of the f...

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  19. A vector vec(A) points verically upward and vec(B) points towards nort...

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  20. Which of the following relation is not correct?

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