When a wood shelf of mass 7.7 kg is fastened inside a slot in a vertical support as shown in (Figure 1) , the support exerts a torque on the shelf. Assume that the slot exerts two vertical forces on the shelf, at points A and B.
Determine the force exerted on the shelf by the support slot at A.
The Attempt at a Solution
I know that the sum of the torques has to equal 0 and that the forces at A and CM is downwards, and upwards at B but I can't seem to get the correct answer (the correct answer is -566N)