We've discussed elevators that are raised with cables, but many elevators use pistons. a pump provides fluid at very high pressure to the piston; the resulting force on the piston raises the elevator and passengers. for a typical piston elevator, the mass of the elevator and passengers is 2000 kg and the radius of the piston is a surprisingly small 4.2 cm. the elevator begins to move upward, accelerating at 0.80 m/s2.