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One pound of nitrogen as an ideal gas expands isothermally at 70 F from a volume of 1 ft3 to a volume of 2 ft3. During this process there is heat transfer to the gas from a single reservoir (the surrounding atmosphere) and the gas does work. Evaluate the work and heat transfer for the process, in Btu. Is this process a violation of the Kelvin-Planck statement of the second law of thermodynamics? Explain why or why not.
a boat of length 50m is designed to cruise at 30 mph and is to be tested in a tow tank with a model of length 0.5 m. if
a cylindrical specimen of a titanium alloy having an elastic modulus of 107 gpa 15.5 times 106 psi and an original
piston and flywheelconsider the one-cylinder four-stroke engine assembly shown in figure 1. the mass of the piston p is
the wheel on a press is 25 inches in circumference and there are 5 threads to the inch. how much resistance on the book
if when machining at high cutting speeds the heat conducted into the tool becomes negligible and the heat conducted
4-lbm of water at 400 psia initially fills the 2.5-ft3 left chamber of a partitioned system. the right chambers volume
a heat pump units operates between two heat reservoirs with temperatures of 270 and 330 k. the heat pump its self has a
air at 40 degree c and 1 atm at volumetric flow rate of 1.5 m3s is joined with co2 at 120 degree c and 1 atm in pipe
Water at 200KPa with a quality of 25%has it temperature raised to 20degrees celcius in a constant pressure process. What is the new quality and volume?
Determine the largest allowable square cross section of a steel shaft of length 6 m if the maximum shearing stress is not to exceed 135 MPa
one pound-mass of air at 10 psia 70 of is contained in a piston-cylinder device. the air is now reversibly compressed
air at 30 celcius and 2 mpa flows at steady state in a horizontal pipeline with a velocity of 25ms . it passes through
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