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A rigid insulated tank contains 0.6 kg of air, initially at 200 kPa, 20 C. The air is stirred by a paddle wheel until its pressure is 250 kPa. Using the ideal gas model with Cv = 0.72 kJ/(kg*K), determine, in kJ, (a) the work, (b) the change in exergy of air, and (c) the amount of exergy destroyed. Ignore the effects of motion and gravity, and let To = 20 C, Po = 100 kPa.
A flywheel can be considered as being composed of a thin disc and a rim. The rim weights 322 lb and has diameters of 24 in and 30 in (inside dia and outside diameter). The disc weights 64.4 lb. determine the mass moment of inertia about the censorial..
in a gas turbine operating at steady state air enters the compressor with a mass flow rate of 5 kgs at 0.95 bar and
The flexural strength of a composite material reinforced with glass fiber is 54,000 psi and the flexural modulus is 15x10^6 psi. A sample, which is 1.5 in wide, 1 in high and 10 in long is supported between two rod 7 in apart.
an insulated piston-cylinder device contains 3 liter of saturated liquid water. the pressure is at 120kpa. now an
calculate the number of schottky defects per cubic meter for sodium chloride at 700 c. assume an energy for defect
A uniform bar of length l and weight w is suspended symmetrically by two strings, set up the differential equation of motion for small angular oscillations of the bar about the vertical axis, and determine its period.
if an isotropic material has a poissonamp39s ratio v. find the percent of volume change after a cube specimen is
A 7/16 nut driver with a 1 1/2 inch diameter handle is used to install a 1/4 20 UNC bolt into a robotic arm. Determine the circumference where the effort is applied
Superheated steam at 600 C and 4000 kPa is fed into a turbo expander at a rate of 10 kg/s. The steam expands and leaves the expander at 500 kPa pressure and 300 C. It is known that there is a heat loss of 50 kJ/sec. This heat loss can be assumed to t..
an engineer proposes to buy a machine for 100000 today that will save 60000 in labor costs at the end of each of the
air at 120 kpa and 260 k is compressed steadily to 575 kpa and 405 k. the mass flow rate of air through the compressor
Determine the mass flow rate of the air passing through this engine and the rates of heat addition and rejection when this engine produces 1000 hp. Assume constant specific heats at room temperature.
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