A light rigid beam is hinged at its left end

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

Problem

A light rigid beam is hinged at its left end. A 3.0 kg mass hangs 0.50 m from the hinge, and an upward vertical cable attached to the right end 1.0 m from the hinge keeps the beam in rotational equilibrium. If the 3.0 kg mass is replaced by a 2.0 kg mass at the same location, what cable tension is required to restore equilibrium? (Take g=9.8 m/s2g = 9.8\,\text{m/s}^2.) (a) 19.6 N19.6\,\text{N} (b) 9.8 N9.8\,\text{N} (c) 14.7 N14.7\,\text{N} (d) 39.2 N39.2\,\text{N}

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