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A wind turbine is rotating at 15 rpm under steady winds flowing through the turbine at a rate of 42,000 kg/s.
A well-sealed room contains 60 kg of air at 200 kPa and 25°C. Now solar energy enters the room at an average rate of 0.8 kJ/s while a 120-W
A well-insulated rigid tank contains 5 kg of a saturated liquid-vapor mixture of water at l00 kPa. Initially, three-quarters of the mass is in the liquid phase.
Simplified analysis of the processes occurring in a spark-ignition internal combustion engine is described by the cold air-standard Otto cycle.
A water-filled reactor with volume of 50 ft3 is at 2000 lbf/in 2, 560 F and placed inside a containment room. The room is well insulated and initially evacuated
Determine the exit pressure, temperature, and area, and the throat area.
A piston/cylinder contains 0.001 m3 airs at 300 K, 150 kPa. The air is now compressed in a process in which P V1.25 = C to a final pressure of 600 kPa.
A window air conditioner that consumes 1 kW of electricity when running and has a coefficient of performance of 4 is placed in the middle of a room
A windmill with rotor diameter of 30 m takes 40% of the kinetic energy out as shaft work on a day with 20oC and wind speed of 30 km/h. What power is produced?
A vacuum pump is used to evacuate a chamber where some specimens are dried at 120 F.
A vacuum gage indicates that the pressure of carbon dioxide in a close tank is - 10 kPa. A mercury barometer gives the local atmospheric pressure as 750 mmHg
A vacuum gage connected to a tank reads 15 kPa at a location where the barometric reading is 750 mm Hg. Determine the absolute pressure in the tank
A vacuum gage at the intake duct to a fan gives a reading of 4.5 in. of manometer fluid. The surrounding atmospheric pressure is 14.5lbf/in2.
A utility runs a Rankine cycle with a water boiler at 3.5 MPa and the cycle have the highest and lowest temperatures of 450°C and 45°C respectively
A vertical hydraulic cylinder has a 125-mm diameter piston with hydraulic fluid inside the cylinder and an ambient pressure of 1 bar.
A vertical cylinder/piston contains R-22 at -20°C, 70% quality, and the volume is 50 L. This cylinder is brought into a 20?C room, and an electric current
A vertical cylinder is fitted with a piston held in place by a pin. The initial volume is 200 L and the cylinder contains moist air at 100 kPa, 25°C
A vertical cylinder fitted with a piston contains 5 kg of R-22 at 10°C. Heat is transferred to the system, causing the piston to rise until it reaches a set
A vertical 12-cm diameter piston-cylinder device contains an ideal gas at the ambient conditions of 1 bar and 24°C.
A water cannon sprays 1 kg/s liquid water at a velocity of 100 m/s horizontally out from a nozzle. It is driven by a pump that receives the water from a tank
A wall surface on a house is at 30°C with an emissivity of e = 0.7. The surrounding ambient to the house is at 15°C, average emissivity of 0.9
A vertical, frictionless piston-cylinder device contains a gas at 250 kPa absolute pressure. The atmospheric pressure outside is 100 kPa, and the piston area
A vertical piston-cylinder device contains water and is being heated on top of a range. During the process, 65 Btu of heat is transferred to the water
Describe the similarities and differences between XML and HTML.
A thin-walled double-pipe counter-flow heat exchanger is used to cool oil (cp = 2.20 kJ/kg) from 150 to 40°C at a rate of 2 kg/s by water (cp = 4.18 kJ/kg)