Q.

A body is in equilibrium under the action of three coplanar forces P, Q and R are shown in the figure. Select the correct statement.

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a

Ptanα = Qtanβ = Rtanγ

b

Psinα = Qsinβ = Rsinγ

c

Psinβ = Qsin γ = Rsinα

d

Pcosα = Qcosβ = Rcosγ

answer is A.

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Detailed Solution

According to Lami's theorem

Psin α = Qsinβ = Rsin γ

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