Question: Q.3(a) Two forces P+Q and P-Q make an angle 2a with one another and their resultant makes an angle with the bisector of the

Q.3(a) Two forces P+Q and P-Q make an angle 2a with one

Q.3(a) Two forces P+Q and P-Q make an angle 2a with one another and their resultant makes an angle with the bisector of the angle between them. Show that Ptan = Qtana. 9 (b) Prove that the necessary and sufficient condition for the equilibrium of a system of coplanar couples is that the algebraic sum of their moments is zero. 8

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