railway RRB JE (CBT I + CBT II) Mock Test 2024 Engineering Mechanics Equilibrium and Friction Equilibrium
In law of parallelogram of forces shown in the figure, the expression for magnitude of resultant (R) is given by:
Where, P and Q are forces acting at a point O
α = angle between two forces
1
\(\rm R=\sqrt{P^2+Q^2+2PQ\cos \alpha}\)
2
\(\rm R=\sqrt{P+Q+2PQ\sin \alpha}\)
3
\(\rm R=\sqrt{P+Q+2PQ\cos \alpha}\)
4
\(\rm R=\sqrt{P^2+Q^2+2PQ\sin \alpha}\)