For each problem, draw a force diagram for the extended body. Show all torques or turning effects. Identify the possible pivot points. 3) A steel beam of mass 350 kg and length L lies on a level surface. A person then lifts one end. Draw a force diagram for this extended body. What is the minimum force required? Lifting force 4) A 3.0-meter long uniform plank of mass 60-kg is placed on top of two saw horses one at each end. A 75-kg painter stands 1.0 m from the left end and a 50-kg painter stands on top of the right end. What upward force does each sawhorse to keep this system in equilibrium exert? O