Q2/ hydraulic cylinder has a piston cross-sectional area of 15 cm2 and a fluid pressure of 2 MPa. If the piston is moved 0.25 m, how much work is done in kj. *

mass should be kg, not N. Make your own assumption. I shall correct accordingly.

The rate of water supply to a hydraulic crane is 90 liters per minute at a steady pressure of 70 bars. Find the input power and the efficiency if the output is 7.5 kW. The power in watts is the product of water supply pressure in N/m sq. and volume flow in M' per second.