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If two numerical equal forces P and P ac...

If two numerical equal forces P and P acting at a point produce a resultant force of magnitude P itself, then the angle between the two original forces is :-

A

`0^(@)`

B

`60^(@)`

C

`90^(@)`

D

`120^(@)`

Text Solution

Verified by Experts

The correct Answer is:
D
We have `P^(2)=P^(2)+P^(2)+2P^(2) cos q`
`rArr " " cos theta =-(1)/(2)`
`theta=120^(@)`
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BANSAL-UNIT DIMENSION, VECTOR & BASIC MATHS-EXERCISE - 1 [SINGLE CORRECT CHOICE TYPE]
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  11. A vector perpendicular to (hat(i)+hat(j)+hat(k)) and (hat(i)-hat(j)-...

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  13. Two constant forces vec(F)(1) and vec(F)(2) acts on a body of mass 8 k...

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  17. If vec(a)=4hat(i)+hat(j)-hat(k) , vec(b)=3hat(i)-2hat(j)+2hat(k) , the...

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  18. Write a force of 10 N in x-y plane in terms of unit vectors hat(i) a...

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