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A piston-cylinder device contains 12 kg of saturated R-134a vapor at 3.2 bars. 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 700C.
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
consider an ideal gas contained in a cylinder that can do work by pushing against a piston which has a surface area of
A circular rod with a diameter of 32.4mm has a groove cut to a diameter of 27mm. A full radius of 2.97mm is produced at the bottom of the groove. Compute the maximum stress in the rod when an axial tensile force of 42kN is applied.
hot water traveling through a thick-walled steel pipe k60 wmmiddotk is cooled externally by a cross-flow airstream at a
steam flows steadily through a nozzle. the steam enters the nozzle at p15mpa and t1350 c the steam leaves the nozzle at
A well insulated 3-m X 4-m X 6-m room initially at 7 degrees C is heated by the radiator of a steam heating system. The radiator has a volume of 15 L and is filled with superheated vapor at 200 kPa and 200 degrees C.
air is compressed in an isentropic process from an initial pressure and temperature of p 1 90 kpa and t1 22 oc to a
Calculate the velocity of a satellite in orbit around the earth in a geosynchronous orbit. Use the definition of a sidereal day which is 86164.09 sec. What is the orbit height in km?
where k is the coefficient of kinetic friction between the blocks and the ground. Also, what is the distance the blocks slide on the surface before they separate?
a design specification requires that a 1008 pound vehicle be able to climb a 38 degree incline at 43 mph. what is the
a well-insulated rigid tank contains 2 kg of a saturated liquid-vapor mixture of water at 100 kpa. initially
Air in a piston-cylinder device is compressed from an initial state (temperature = 80 °C, pressure = 100 kPa, volume = 0.3 m3) to a final state (temperature = 250 °C, pressure = 600 kPa), during a polytropic process (n = 1.28094065700868). What is th..
a 10-kg block is attached to spring a and connected to spring b bycord and pulley. the block is held in the position
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