Please include all steps for understanding! Including how to get values for the free body diagram. Thanks in advance!

a. Draw a free body diagram of the lever and the rocks. b. if we want to hold still in the above situation, how much tension force is needed? (Hint: Static equilibrium.) c. Holding still in this situation, what magnitude of force must the pin in the middle V . withstand? /.\\ \"1"-7- var-D