1.A hydraulic lift is lifting a car that weighs 14 kN. The area of the piston supporting the car is A, the area of the other piston is a, and the ratio A/a is 101.7. How far must the small piston be pushed down to raise the car a distance of 1.2 cm
2.The pressure inside a bottle of champagne is 4.8 atm higher than the air pressure outside. The neck of the bottle has an inner radius of 0.9 cm. What is the frictional force on the cork due to the neck of the bottle?
3.A hair breaks under a tension of 1.1 N. What is the diameter of the hair? The tensile strength is 2.0 ✕ 108 Pa.
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