What is the magnitude of Force P?
Find moment of each force 150N and P about x axis.
Moment of 150N = Force x lever arm
Lever arm = perpendicular distance to line of action of force
Moment of P = P x Lever arm
Lever arm= perpendicular distance of line of action of P to x-axis
= 10.sin30 = 5cm
At equilibrium net moment about x will be zero.
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