Equilibrium: A uniform rod weighs 40 N and is 1.0 m long. It is hinged to a wall at the left end, and held in a horizontal position at the right end by a vertical string of negligible weight, as shown in the figure. What is the magnitude of the torque due to the string about a horizontal axis that passes through the hinge and is perpendicular to the rod? The hinge is very small with negligible friction.
A. 40 N ? m
B. 10 N ? m
C. 5.0 N ? m
D. 20 N ? m
E. 30 N ? m
Answer: D
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