What is the mass of the diver in if she exerts a torque of 2300 N·m on the board, relative to the left (A) support post?
The plank is in static equilibrium ....the torque at B must be balanced
From B perspective
F * d = Fd 3 Fd = force of diver = ma
2300 = 3 * ma
= 3 * m (9.81) m = 78.15 kg