A truck-mounted crane in Figure 3 is moving a 1200-lbf concrete block on a construction site. The person at point B is helping the crane keep the block in static equilibrium before it is lowered to the ground. The frictionless connection ring at point C has a mass of 0.155 slugs and a = 24. Calculate the magnitudes of the tension force in cable AC and the force the person applies through the rope BC. (Notice that the cable that connects the 1200-lbf weight to the connection ring is vertical.) Figure 3 A person helping the crane balance a 1200-lbf block. A 10-kg cylinder is suspended by the frictionless and massless spring-pulley system in Figure 4 (the ring that connects the springs has negligible mass). Each spring has a rest (unstretched) length of 1 m. Find the set of spring stiffnesses kAD, km, and [cm that keeps this 10-kg cylinder in static equilibrium