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A well-insulated vertical piston-cylinder device contains air. The diameter of the piston is 8 inches. Atmospheric pressure of 14.7 lbf/in2 acts on the outside the cylinder and the piston mass is 165 Ibm. An electric resistor within the cylinder receives a current of 1 A from an external battery of 10 V for a duration of 60 minutes causing the piston to move upwards by 9.85 inches. The acceleration due to gravity g = 32.2 ft/s2. State all your assumptions Draw the system sketch Draw the process for air on the P-v diagram and label the initial state as 1 and the final state as 2; Calculate the pressure of air inside the cylinder before the piston moves, in lbf/in2 and psi. Calculate the work due to expansion of air in the cylinder, in Btu; Indicate whether the work is done by the system or on the system used for part (e); Determine the electrical work, in Btu; Calculate the change in internal energy of air, in Btu.
a building has a peak heating load equal to 18.3 kw and a peak cooling load of 23.8 kw. estimate the seasonal heating
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steam enters a well insulated nozzle operating at steady state at 1000?f and 500lbfin2 and velocity 10fts. at the
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Find the velocity of the bullet and block just after impact.
A flat bar is to be rolls but the rolls refuse to bite (the bar is not drawn into the roll gap). State at least two measures that could be taken.
a 1500-kg car enter an s-curve at a with a speed of 96 kmh with brakes applied to reduce the speed to 72 kmh at a
100 kg of liquid water at 25C and 50 kg of ice at 0C are placed in an isolated container. (a) (b) (c) Find the initial volume of the liquid-ice mixture, in m3. Determine the volume after all the ice is melted, in m3. Will the temperature of the li..
calculate the maximum permissible crack size in acenter cracked panel subjected to a unifrom stress of 20 ksi. the toughness is 50 ksi"in, the yield stress is 60 ksi, w=12 inches
a two-cylinder 250 cm3 displacement motorcycle engine that operates on an ideal otto cycle at 4500 rpm. the compression
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