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If ` vec a+ vec b+ vec c=0` and `| vec a|=3,\ | vec b|=5` and `| vec c|=7` , show that the angle between ` vec a` and ` vec b` is `60^0` .

A

`pi/3`

B

`5pi/3`

C

`2pi/3`

D

`pi/6`

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A DAS GUPTA-Product of two Vectors-Exercise
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  6. If vec a * vec b = vec a * vec c then

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  7. If vec(A)+vec(B)+vec(C )=0 then vec(A)xx vec(B) is

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  8. If vec a xx vec b= vec b xx vec c != vec 0 then which one is true wh...

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  10. If |vec a|= |vec b|= 1 and |vec a xx vec b|=1 then

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  13. If vec a+ vec b+ vec c=0 and | vec a|=3,\ | vec b|=5 and | vec c|=7 ...

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  14. If vec(a). vec(b) = 0 and vec(a) xx vec(b) = vec(0) then which one of ...

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  15. If vec a=4 hat i+6 hat ja n d vec b=3 hat j+4 hat k , then find the c...

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  16. In each of the following, fill in the blank so that the resulting stat...

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  17. If vec(A) xx vec(B) = vec(B) xx vec(A), then the angle between A to B ...

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