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A piston-cylinder device contains 12 kg of saturated R-134a vapor at 3.2 bar. An electric source supplies 8 A current to a resistor within the cylinder for 4 minutes and there is heat transfer of 400 kJ to the system. During these energy interactions, the pressure is maintained constant in the cylinder. The refrigerant reaches a final temperature of 70 degree C. Determine (a) The voltage of the source. (b) Show the expansion process for the R-134a on a P-v diagram. Label states, show property values, and indicate appropriate lines of constant pressure.
The system is at rest in the position shown, with the 12-lb collar A resting on the spring (k = 20 lb/ft), when a constant 30-lb force is applied to the cable. What is the velocity of the collar when it has risen 1 ft? The collar is attached to th..
a building for which the heat transfer rate through the walls and roof is 1350 btuh per degree temperature difference
a 1200 lb wrecking ball with a velocity of 4 fts at the bottom of its arc strikes a wall and comes to rest in a
A tank contains 10,000 kg of xenon at 132 C, 82 bar. The plant supervisor asks you to remove xenon and fill the tank with 10,000 kg of steam at 200 C. What is the pressure in the tank when it is filled with steam?
fine pearlite and a small amount of martensite are found in a quenched 1080 steel. what microstructure would be
An oil storage tank has a flat, horizontal, circular roof that is 77 ft in diameter. The tank has a vent to the atmosphere to allow air to move in and out as the tank is filled or emptied. The vent is plugged by snow in a blizzard while the oil is be..
If the motorcycle has a deceleration of a_t = -(0.001s);{rm m}/{rm s}^{ 2 } and its speed at position A is 18 m/s, determine the magnitude of its acceleration when it passes point B.
consider a cogeneration power plant modified with regeneration. steam enters the turbine at 6 mpa and 450 celsius and
the body is formed of slender rod and rotates about a fixed axis through point with the indicated angular properties.
Fluid mechanics boundary layer theory
A 7.1cm external diameter, 6m long hot water pipe at 85 C is losing heat to the surrounding air at 15 C by natural convection with a heat transfer coefficient of 40 W/m2 C. Determine the rate of heat loss from the pipe by natural convection in Kw.
a steam pipe of 120 mm outside diameter and is covered with a 20 mm thick layer of calcium silicate insulation k
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