Question

Two equal forces acting at a point on a body have there resultant equal to one of the forces, the angle between the force is

Answer 1

Answer

Correct option is

B

⇒θ=120

o

Here A=F;B=F;R=F;θ=?

Now R=

A

2

+B

2

+2ABcosθ

F=

F

2

+F

2

+2F.F.cosθ

=F

2(1+cosθ)

⇒1=2(1+cosθ)

cosθ=−

2

1

=cos120

o

⇒θ=120

o