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If a + b + c = 0, |a| = 3, |b| = 5, |c| ...

If `a + b + c = 0, |a| = 3, |b| = 5, |c| = 7`, then the angle between a and b is

A

`pi//6`

B

`2pi//3`

C

`5pi//3`

D

`pi//3`

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The correct Answer is:
D
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ML KHANNA-ADDITION AND MULTIPLICATION OF VECTORS -Problem Set (2) (MULTIPLE CHOICE QUESTIONS)
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  2. The modulus of the sum of three mutually perpendicular unit vectors is

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  11. If |a| = |b| = |a + b| = 1, then |a-b| is equal to

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  12. If all the vectors a, b, c, a + b, b + c and a + b +c be unit vectors...

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  13. If ( vec axx vec b)^2+( vec adot vec b)^2=144a n d| vec a|=4, then fin...

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