3-1.Vectors
medium

$F$ અને $2F$ બળોનું પરિણામી એ $F$ ને લંબ છે.તો બે બળ વચ્ચેનો ખૂણો ........ $^o$ હશે.

A

$60$

B

$120$

C

$150$

D

$90$

Solution

(b) $\tan \alpha = \frac{{2F\sin \theta }}{{F + 2F\cos \theta }} = \infty $   (as $\theta = 90^°$)

$⇒$ $F + 2F\cos \theta = 0$

$⇒$ $\cos \theta = – \frac{1}{2}$ 

$\theta = 120^\circ $

Standard 11
Physics

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