Answer Happy

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11. A piston of cross-sectional area a is used in a hydraulic press to exert a small force of magnitude fon the enclosed liquid. A connecting pipe leads to a larger piston of cross-sectional area A as shown below. (a) What force magnitude F will the larger piston sustain without moving? [5 (b) If the piston diameters are 3.80 cm and 53.0 cm, what force magnitude on the small piston will balance a 20.0 kN force on the large piston? [5] F А 12. For the car lift shown in the figure below, the pistons on the left and right have areas 25 cm and 750 cmº respectively. The car and the right piston have a total weight of 15,000 N. Load F1 AI A2 F2 (a) What force must be applied on the left piston (if it has negligible weight)? [5] (b) What pressure will produce this force? 13. A boat floating in fresh water displaces water weighing 35.6 kN. (a) What is the weight of the water this boat displaces when floating in salt water of density 1.10 x 103 kg/m3? [5] (b) What is the difference between the volume of fresh water displaced and the volume of salt water displaced? [51 00 8