A spring of spring constant 5.00*10^4N/mis between a rigid beam and the output piston of a hydraulic level.an empty container with negligible mass sits on the output piston. The input piston has an area Ai, and the output piston has an area of 22.0Ai.initially the spring is at rest length.how many kilograms of sand must be slowly poured into the container to press the spring by 7.00 cm.