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A piston cylinder arrangement has an impeller protruding through the wall so that mechanical work can be done on the system. The piston weighs 15 lbf and is a circular disk with a diameter of 4 inches. The cylinder contains 1lbm of air initially at 537R that is heated to 640R by 17 Btu heat addition and shaft work. If the change in internal energy for the air is 25 Btu/lbm, how much shaft work was done by the impeller? Note: the air obeys the relation that pV=mRiT. Note: the MW of air can be assumed to be 29 lbm/lbmole and the specific gas constant for air is Ri = 53.34 ft lbf/lbmR
sea-level air is drawn from the atmosphere through a duct and into a vacuum tank. if the air remains a perfect gas at
consider a rigid tank with a partition such that there are two equal volumes which are known. on one side has water at
A simple ideal Rankine cycle with water as the working fluid operates between the pressure limits of 15 MPa in the boiler and 100 kPa in the condenser. Saturated steam vapor enters the turbine. Determine the work produced by the turbine, the heat tra..
determine: (a) the cutting time to complete the facing operation, (b) the cutting speeds and metal removal rates at the beginning and end of the cut.
A piston-cylinder device holds 2 kg of refrigerant fluid R-134a, initially at 500 KPa. At this state, 0.5 kg of the fluid is in the liquid phase. Heat is then added to the fluid at constant pressure to increase its temperature to 60 c.
a piston-cylinder assembly contains a 2 phase liquid-vapor mixture of water initially with a pressure of 500 kpa and a
An ideal vapor-compression refrigeration system operates at steady state with Refrigerant 134a as the working fluid. Superheated vapor enters the compressor at 30 lbf/in2, 20F, and saturated liquid leaves the condenser at 140 lbf/in2. The refriger..
the king and his two children are imprissoned at the top of a tall tower.stonemasons have been working on the tower and
A rigid tank contains water vapor at 200 degrees celcius and unknown pressure. When the tank is cooled to 150 degrees celcius, the vapor starts condensing. Estimate the initial pressure in the tank.
a block of mass 10 kg and measuring 250 mm on each edge is pulled up an inclined surface on which there is a film of
the average january temperature for rome italy is 44.2 degf and the average july temperature is 74.8 degf. how much
you have three blocks of different materials at various temperatures. they are 2-kg block of iron at 600 k a 3-kg block
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