A Sankey diagram is drawn for one operating cycle of a hydraulic press, during which 1.2 kJ of energy is supplied. The table gives the widths of two of its arrows.
| Arrow | Width |
|---|---|
| energy supplied to the press | 40 mm |
| energy transferred to thermal stores | 10 mm |
The only other output is the work done by the piston. During the pressing stroke, the piston moves 0.050 m in the direction of a constant force.
What is the value of the force exerted by the piston?
18 000 N18\,000\ \mathrm{N}18000 N
30 000 N30\,000\ \mathrm{N}30000 N
24 000 N24\,000\ \mathrm{N}24000 N
6000 N6000\ \mathrm{N}6000 N