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Mech. Eng. 2W04, 2014 Thermodynamics Assignment # 1 Solution Introductory Concepts 1.Perform the following unit conversions: (a) 122 in3to L (b) 778.17 ft . lbf to kJ (c) 100 hp to kW (d) 1000 lb/h to kg/s (e) 29.392 lbf/in2to bar (f) 2500 ft3/min to m3/s (g) 75 mile/h to km/h (h) 1 ton (=2000 lbf) to N
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Mech. Eng. 2W04, 2014 Thermodynamics 2.A gas is contained in a vertical, frictionless piston-cylinder device. The piston has a mass of 4 kg and a cross-sectional area of 35 cm2. A compressed spring above the piston exerts a force of 60 N on the piston. If the atmospheric pressure is 95 kPa, determine the absolute pressure inside the cylinder. Analysis Drawing the free body diagram of the piston and balancing the vertical forces yield springatmFWAPPA++=Thus, kPa123.35=×++=++=−2242springatmN/m1000k