Download An Introduction to Thermodynamics l - Homework 1 | MEEN 2210 and more Assignments Thermodynamics in PDF only on Docsity! MEEN2210 Thermodynamics I Homework set #1 due by Jan 29 1.21: A closed system consists of 0.5 kmol of ammonia occupying a volume of 6 m3. Determine (a) the weight of the system, in N, and (b) the specific volume, in m3/kmol and m3/kg. Let g=9.81 m/s2. 1.35: The barometer shown in Fig. P1.35 contains mercury (ρ=13.59 g/cm3) . If the local atmospheric pressure is 100 kPa and g=9.81 m/s2, determine the height of the mercury column, L, in mmHg and inHg. 1.40: Refrigerant 22 vapor enters the compressor of a refrigeration system at an absolute pressure of 20 lbf/in.2 A pressure gage at the compressor exit indicates a pressure of 280 lbf/in.2 (gage). The atmospheric pressure is 14.6 lbf/in.2 Determine the change in absolute pressure from inlet to exit, in lbf/in.2, and the ratio of exit to inlet pressure. 1.42: Warm air is contained in a piston-cylinder assembly oriented horizontally as shown in Fig. P1.42. The air cools slowly from an initial volume of 0.003 m3 to a final volume of 0.002 m3. During the process, the spring exerts a force that varies linearly from an initial value of 900 N to a final value of zero. The atmospheric pressure is 100 kPa, and the area of the piston face is 0.018 m2. Friction between the piston and the cylinder wall can be neglected. For the air in the piston-cylinder assembly, determine the initial and final pressures, each in kPa and atm. 1.52: Natural gas is burned with air to produce gaseous products at 1985°C. Express this temperature in K, °R and °F. 2.10: An object whose mass is 300 lb experiences changes in its kinetic and potential energies owing to the action of a resultant force R. The work done on the object by the resultant force is 140 Btu. There are no other interactions between the object and its surroundings. If the object's elevation change in 100 ft and its final velocity is 200 ft/s, what is its initial velocity, in ft/s? Let g = 32.2 ft/s2.
