Three concurrent coplanar forces P=20 N, Q=21 N and R=29 N keep a particle in equilibrium. If α is the angle between Q a...

Type: MCQ • Marks: 1

Three concurrent coplanar forces P=20 N, Q=21 N and R=29 N keep a particle in equilibrium. If α is the angle between Q and R, find sin α.

A. 29/20

B. 21/29

C. 20/29

D. 20/21

Explanation

By Lami’s theorem, P/sinα=Q/sinβ=R/sinγ. Thus sinα=P/R=20/29.

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UP TGT Mathematics

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