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Helium gas is contained in a rigid vessel of 0.5 m3 at 500 kPa. The gas is agitated violently by a stirrer that transfers 250 kJ of work to the gas. Assuming that the system undergoes an adiabatic process, determine the final pressure of the gas. Assume that Cv for helium is a constant at 12.46 kJ/kmol·K.
in an air standard regenerative gas turbine cyclethe pressure ratio is 5.air enters the compressor at 1 bar 300 k and
a rigid tank is filled with refrigerant r-134a at 310 k. an electric current of 0.2 amps over 220 volts is passed
a real object is located at the zero end of a meter stick. a large concave mirror at the 100 cm end of the meter stick
the steel rails of a railroad track are laid in the winter at a temperature of 15 f with gaps of 0.01 ft between the
when tomatoes are broken or crushed for processing into liquid products such as juice or sauce they must be heated
a well-insulated heat exchanger is used to heat water cp 4.18 kjkgk from 300 k to 90degc with a mass flow rate of 3
water flows in a long electrical heated tube with q constant . the velocity and temperature profiles are fully
The wash still in a whisky distillery uses mechanical vapour re-compression as shown in the simplified diagram of the Figure shown below. The vapour from the still is at 80° C. Take a minimum temperature difference between the vapour leaving the stil..
estimate the temperature at which the top land very top of the piston would be touching the liner that is kept at a
A 60-kg iron block and a 39-kg copper block, both initially at 76oC, are dropped into a large lake at 9oC. Thermal equilibrium is established after a while as a result of heat transfer between the blocks and the lake water. Determine the total entrop..
calculate the overall efficiency the heat rate mw and the total fuel rate kgs of a combined-cycle power plant 1 if no
consider a cylindrical nickel wire 1.9 mm in diameter and 3.2 times 104 mm long. calculate its elongation when a load
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