Final answer:
To calculate the force by each jaw of the pliers and the force on the pin at A, the mechanical advantage and distances from the fulcrum to the applied forces are needed. Without this information, a numerical answer can't be provided, but the force on the pin equals the sum of all forces in equilibrium.
Step-by-step explanation:
The question involves the concept of forces and mechanics in physics, specifically concerning the force applied by each jaw of the pliers and the force supported by the pin at point A when a force is applied to the handles of the pliers. To solve for the force applied to the round rod by each jaw, we would normally need the mechanical advantage and the distances from the fulcrum to where the forces are applied (which are not provided in the question). Without this information, we can't provide a numerical answer. However, the force supported by the pin would be the resultant force due to the applied forces on the pliers. The force at the pin could be a combination of the input force at the handles and the reaction forces at the jaws. To find the force supported by the pin, we would sum up all the forces acting on the system and use equilibrium conditions (ΣFx = 0 and ΣFy = 0).