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Air undergoes a polytropic expansion process in a piston-cylinder assembly from 75 psia and 300 F to 15 psia. Employing the ideal gas model with constant specific heat ratio k, determine the temperature at the end of the process and the amounts of work and the heat transfer per unit mass in Btu/lb if
a) n=1.3
b) n=k
with k=1.4 and R=0.0686 Btu/lbR.
Calculate the number of vacancies per cubic meter in gold at 900°C. The energy for vacancy formation is 0.98 eV/atom. Furthermore, the density and atomic weight for Au are 18.63 g/cm3 (at 900°C) and 196.9 g/mol, respectively.
An oven door consists of a layer of asbestos sandwiched between a layer of steel on the inner surface and a layer of wood on the outer face
water is the working fluid in an ideal vapor power cycle with reheat. superheated vapor enters the first turbine stage
Important information about Overall Heat Transfer Coefficient A copper sphere of internal diameter 2 m and wall thickness 40 mm is insulated with 75 mm of expanded polystyrene
during a particular thunderstorm the electric potential difference between a cloud and the ground is vcloud - vground
what was its velocity during this time? (Hint: Take the origin to be the location of the radar.)
water flows steadily through an outflow nozzle. known conditions are d1 15 cm v1 3 ms d2 9 cm. assume that the water
Sketch the thermal circuit of the system. Label (using the above symbols) all pertinent nodes and resistances.
a distillation column with a total condenser and a partial reboiler is separating two feeds. the first feed is a
a closed system of mass 6lbm undergoes a process in which there is a heat transfer of 245 ft-lbf from the system to
if a water tank is to be installed on the roof top of the utpa administration building to supply water for the campus.
Estimate the mass flow rate of fuel into the engine in kg/h.
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