Physics, 21.02.2020 20:40 badpotterchris
One-half kg of Refrigerant 134a is contained in a piston-cylinder assembly, initially a saturated vapor at 200 kPa. The refrigerant undergoes a process for which the pressure-specific volume relation is p v^1.3 = constant, to reach a final state of superheated vapor at 400 kPa. Kinetic and potential energy effects can be neglected.
a. Solve for the specific volume at the end of the process.
b. Give the final temperature, and final specific internal energy (linear interpolation may be needed)
c. Evaluate the work involved in the process, in kJ. Did the system do work?
d. Determine the heat involved, in kJ.
Answers: 2
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Ametal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. these magnets produce an initial uniform field of 1.12 t between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.240 t/s . (a) what is the magnitude of the electric field induced in the ring? (b) in which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet?
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Physics, 22.06.2019 19:50
The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.
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Physics, 22.06.2019 21:00
If the specific heat of a metal is 0.850 j/g °c, what is its atomic weight?
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One-half kg of Refrigerant 134a is contained in a piston-cylinder assembly, initially a saturated va...
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