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A unit vector is represented as (0.8hat(...

A unit vector is represented as `(0.8hat(i)+bhat(j)+0.4hat(k))`. Hence the value of 'b' must be

A

0.4

B

`sqrt0.6`

C

0.2

D

`sqrt0.2`

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The correct Answer is:
D
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TARGET PUBLICATION-SCALARS AND VECTORS-Competitive Thinking
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  8. The vector vec(P)= ahat(i)+ahat(j)+3hat(k) and vec(Q)= ahat(i)-2hat(j)...

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

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

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  12. A force (4hat(i)+hat(j)-2hat(k))' N with velocity at (2(i)+2hat(j)+3h...

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

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

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

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

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

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