In raising a 6200-n piano with a pulley system, the movers note that, for every 2.2 m of rope pulled down, the piano rises 0.12 m . ideally, find the force required to lift the piano.

In the hydraulic press  (like raising the piano with a pulley system) which depends on Pascal principle, the pressure (P) on the left side should equal to the pressure in the right side in the ideal processes.

then

when

note: using the capital and small symbols to different between the right and left sides

then

also, under the save of the energy, the work done on the left side equals to the work done on the right side

when where y is the distance which the body got up or down

thus