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A piston cylinder arrangement has an impeller protruding through the wall so that mechanical work can be done on the system. The piston weighs 15 lbf and is a circular disk with a diameter of 4 inches. The cylinder contains 1lbm of air initially at 537R that is heated to 640R by 17 Btu heat addition and shaft work. If the change in internal energy for the air is 25 Btu/lbm, how much shaft work was done by the impeller? Note: the air obeys the relation that pV=mRiT. Note: the MW of air can be assumed to be 29 lbm/lbmole and the specific gas constant for air is Ri = 53.34 ft lbf/lbmR
in an air-conditioning installation a flow rate of 1750 cfm of air at 50 degree ferenheit is required. a smooth sheet
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you are given a task of compressing a fixed quantity of gas from P1,T1 to P2,T1. you wish to do this using a polytropic process coupled with a constant pressure P2 heat-transfer process. determine the polytropic process that minimizes the entropy ..
Horsepower and efficiency of three-phase motor, If a fully loaded 440V, three-phase motor draws 12.4 A at 86% power factor (pf). It's speed is 1730 rpm and its torque output to a mechanical load is 29.1 lb-ft x 1.356 = 39.5 Nm.
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What is the advantage of sketching an object first before drawing it using CAD?
a section of a roller-coaster is a horizontal cylindrical helix. the velocity of the cars as they pass point a is 15
a stone with a mass of 2 kg is thrown vertically into the air by a powerful catapult to an elevation of 100 m where the
a fin array consists of 6 rectangular fins on a 2mm thick 100mm by 180mm plate. the array is made of aluminum and each
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Calculate the maximum energy that a 3-MeV alpha particle can transfer to an electron in a single collision
The refrigerant R-410a is contained in a piston-cylinder device, as shown in the figure, where the volume is 13 L when the piston hits the stops. The initial state of the fluid is -30 °C, 150 kPa, with a volume of 10 L. The entire system is brought i..
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