A light rod is horizontal

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A light 2.0 m2.0\,\text{m} rod is horizontal. A 40 N40\,\text{N} upward force is applied at 0.20 m0.20\,\text{m} from the left end, and a 20 N20\,\text{N} downward force is applied at 1.60 m1.60\,\text{m} from the left end. At which of the following positions, measured from the left end, should a pivot be placed so that the net torque on the rod is zero? (a) 0.40 m0.40\,\text{m} (b) 1.10 m1.10\,\text{m} (c) 0.67 m0.67\,\text{m} (d) 0.80 m0.80\,\text{m}

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