A rectangular plank with mass m kilograms measures x metres
wide by y metres high. It is clamped at its very left edge, one
third of the way down from the top, as shown. To keep the
plank level, the clamp must exert a torque of
Physics - drwls, Sunday, May 20, 2012 at 6:28pm
..equal to the torque about the clamp produced by the plank's weight acting at the center of mass.