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A spherical balloon contains 2 kg of R-22 at 0°C, 30% quality. This system is heated until the pressure in the balloon reaches 600 kPa.
A spherical balloon contains 10 lbm of air at 30 psia and 800 R. The balloon material is such that the pressure inside is always proportional
A soap bubble has a surface tension of S = 3* 10-4 N/cm as it sits flat on a rigid ring of diameter 5 cm. You now blow on the film to create a half sphere
A small, high-speed turbine operating on compressed air produces a power output of 100 W. The inlet state is 400 kPa, 50°C, and the exit state is 150 kPa
A rope hangs over a pulley with the two equally long ends down. On one end you attach a mass of 5 kg and on the other end you attach 10 kg.
A room is heated with an electric space heater on a winter day. Examine the following control volumes, regarding heat transfer and work, including sign.
A room is filled with saturated moist air at 25°C and a total pressure of 100 kPa. If the mass of dry air in the room is 100 kg, the mass of water vapor.
A room is cooled by circulating chilled water through a heat exchanger located in a room. The air is circulated through the heat exchanger by a 0.25-hp
A room contains air at 70°F and 14.6 psia at a relative humidity of 85 percent. Determine (a) The partial pressure of dry air
A sealed rigid vessel has volume of 35 ft3 and contains 2 lbm of water at 200 F. The vessel is now heated.
A saturated air-water vapor mixture at 20 oC, 100 kPa, is contained in a 5-m3 closed tank in equilibrium with 1 kg of liquid water. The tank is heated to 80oC.
A sales person selling refrigerators and deep freezers will guarantee a minimum coefficient of performance of 4.5 year round. How would you evaluate that?
The mass fraction of steam that condenses at the turbine exit. You should solve the problem in a step by step. You should include all the units which are needed
A sheet of rubber is stretched out over a ring of radius 0.25 m. I pour liquid water at 20oC on it so the rubber forms a half sphere (cup).
A sharp-edged orifice is used to measure the flow of air in a pipe. The pipe diameter is 100 mm and the diameter of the orifice is 25 mm
A semi permeable membrane is used for the partial removal of oxygen from air that is blown through a grain elevator storage facility
A rigid tank contains an ideal gas at 300 kPa and 600 K. Now half of the gas is withdrawn from the tank and the gas is found at 100 kPa at the end of the proces
A rigid tank initially contains 1.4-kg saturated liquid water at 200°C. At this state, 25 percent of the volume is occupied by water and the rest by air
A six-cylinder, four-stroke, 4.5-L compression-ignition engine operates on the ideal diesel cycle with a compression ratio of 17.
A simple ideal Rankine cycle operates between the pressure limits of 10 kPa and 3 MPa, with a turbine inlet temperature of 600°C.
A rigid, insulated vessel contains superheated vapor steam at 450 lbf/in 2, 700 F. A valve on the vessel is opened, allowing steam to escape
A rigid vessel initially contains 2 kmol of carbon and 2 kmol of oxygen at 25?C, 200 kPa. Combustion occurs, and the resulting products consist of 1 kmol
A rigid tank with a volume of 2.5 m3 contains 15 kg of saturated liquid-vapor mixture of water at 75°C. Now the water is slowly heated
A rigid tank initially contains 100 L of saturated-liquid R-12 and 100 L of saturated-vapor R-12
A rigid tank containing 0.4 m3 of air at 400 kPa and 30°C is connected by a valve to a piston-cylinder device with zero clearance