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The angle between the lines whose dir...

The angle between the lines whose direction cosines satisfy the equations `l+m+n=""0` and `l^2=m^2+n^2` is (1) `pi/3` (2) `pi/4` (3) `pi/6` (4) `pi/2`

A

`(pi)/(3)`

B

`(pi)/(4)`

C

`(pi)/(6)`

D

`(pi)/(2)`

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A
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MOTION-VECTOR -EXERCISE - 4 ( LEVEL -I)
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  5. Let vec(a) = hat(i) + hat(j) + hat(k), vec(b) = hat(i) - hat(j) + 2hat...

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  6. The non-zero vectors are vec a,vec b and vec c are related by vec a= ...

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  9. Let veca=hatj-hatk and vecc=hati-hatj-hatk. Then the vector vecb satis...

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  11. The vectors veca and vecb are not perpendicular and vecac and vecd are...

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  15. If [(vecaxxvecb, vecbxxvecc, veccxxveca)]=lamda[(veca, vecb, vecc)]^(2...

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  16. The angle between the lines whose direction cosines satisfy the equ...

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  17. Let veca, vecb and vecc be non-zero vectors such that no two are colli...

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  18. Let veca, vecb and vecc be three unit vectors such that vecaxx(vecbxxv...

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