1. A hydraulic lift office chair has its seat attached to a piston with an area of 11.2 cm². The chair is raised by exerting force on another piston, with an area of 4.12 cm². If a person sitting on the chair exerts a downward force of 219 N, what force needs to be exerted on the small piston to lift the seat?

We know that the law of conservation of energy states that energy can not be created or destroyed. it only changes form. consider this energy transformation diagram. assume that the energy input in this case is chemical potential energy and the useful energy output is kinetic energy, specifically a small fan to keep you cool. the diagram also shows how to calculate the efficiency of the fan. if the law of conservation of energy holds true, explain why the efficiency of the fan is not 100%.