A hydraulic lift in a garage has two pistons: a small one of cross-sectional area 4.00 cm2 and a large one of cross-sectional area 250 cm2.
(a) If this lift is designed to raise a 3500-kg car, what minimum force must be applied to the small piston?
(b) If the force is applied through compressed air, what must be the minimum air pressure applied to the small piston?