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1. As shown in Fig. P6.66, an insulated box is initially divided into halves by a frictionless, thermally conducting piston. On one side of the piston is 1.5 m3 of air at 400 K, 4 bar. On the other side is 1.5 m3 of air at 400 K, 2 bar. The piston is released and equilibrium is attained, with the piston experiencing no change of state. Employing the ideal gas model for the air, determinestate to a state where the temperature is 500 K, while volume remains constant.
(a) The temperature rise is brought about adiabatically by stirring the air with a paddle wheel. Determine the amount of entropy produced, in kJ/kg ? K.
(b) The temperature rise is brought about by heat transfer from a reservoir at temperature T. The temperature at the system boundary where heat transfer occurs is also T. Plot the amount of entropy produced, in kJ/kg ? K, versus TforT$ 500 K. Compare with the result of (a) and discuss.
What is the total change in velocity required to go from a 200 km altitude circular, Earth orbit to circular orbit with a radius of 384,000 km (the mean radius of moons orbit relative to the earth, but ignore the moons presence}?
a pressure transducer has a natural frequency of 50 khz and a damping ratio of 0.4. it is to be used to measure
A mineshaft is drilled from the surface of a planet of mass M and radius R all the way to the center. If a rock is dropped into the shaft, at what speed v would it hit the bottom of the shaft?
A mass of 2.5kg are hung vertically from a spring of stifness 5.4kN/m, calculate the maximum amplitude of vibration if the mass is not to jump off the hook.
what is the magnitude of the impulse applied to the projectile by its weight from t 0 s to 3 s? given mass of
Refrigerant 22 enters an insulated compressor operating at steady state as saturated vapor at - 16 C with a mass flow rate of 1.5 kg/s. Refrigerant exits at 7 bar, 70 C. Changes in KE and PE from inlet to exit can be ignored. Determine: (a) the volum..
consider the 1-d steady state conduction in a plane wall. the heat flux qx through the wall must be constant. the wall
2. Often, the properties of multiphase alloys may be approximated by the relationship ferrite form? (b) How many kilograms of eutectoid ferrite E 1alloy2 = EaVa + EbVb (9.24) form?
1. Is it possible for two screw dislocations of opposite sign to annihilate each other? Explain your answer. 2. For each of edge, screw, and mixed dislocations, cite the relationship between the direction of the applied shear stress and the directi..
a simple turbojet is operating with a compressor pressure ratio of 8.0 a turbine inlet temperature of 1200 k and a mass
Determine the phase or phases in a system consisting of h20 at the following conditions and sketch p-v and t-v diagrams showing the location of each state (a)p=100 lbf/in^2, T=327.86F (b)p= 100lbf/in^2, T240F. (c)T=212F, p=10lbf/in^2 (d)T=70F, p=20lb..
a fan draws air from the atmosphere through a 0.30m diameter round duct that has a smoothly rounded entrance. a
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