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In a car lift compressed air exerts a force F1 on a small piston having a radius of 5 cm. The pressure is transmitted to a second piston of radius 15 cm. If the mass of the car to be lifted is 1350 kg, what is F1,? What is the pressure necessary to accomplish this task?

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Since Pressure is transmitted undiminished throughout the fluid,

F1 = A1/A2 F2 = {π(8 x 5)}/{π(5 x 15)} x (1530 x 9.81) = 1.5 x 103 N

The air pressure that will produce this force is

p = F1/A1 = {1.5 x 103}/{π(5 x 10-2)2} = 1.9 x 103 Pa

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