A 2.0m long uniform rod of mass 1.0kg is pivoted at point P and it is in equilibrium under the forces acting on it as shown in the diagram (a force F at 60 degrees to the rod acting 50cm from the left end, the pivot P just right of that, and a 20N weight hanging from the right end). What is the value of force F?

A40 N

B70 N

C120 N

D140 N

ZIMSEC Physics Paper 1, June 2003, Q5

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