A gas is contained in a vertical, frictionless piston-cylinder device. The piston has a mass of 5 kg and a cross-sectional area of 35 cm². A compressed spring above the piston exerts a force of 76 N on the piston. If the atmospheric pressure is 95 kPa, determine the pressure inside the cylinder. ww A = 35 cm² P=? Patm = 95 kPa .mp=5 kg The pressure inside the cylinder is kPa.

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If F1 = 390 N force is applied to the piston with d1 = 4 cm diameter, what is the magnitude of the force F2 that can be resisted by the piston with d2 =  10 cm diameter? Neglect the weights of the pistons.

2-30 The water in a tank is pressurized by air and the pressure is measured by a multifluid manometer as shown in Fig.P2-30. Determine the gage pressure of air in the tank if h₁-0.2 m, h₂-0.3m, and h₂ =0.4m. Take the densities of water, oil and mercury to be 1000 kg/m³, 850 kg/m³ and 13600 kg/m³, respectively. Oil Air Water FIGURE P2-30 Mercury