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An air-conditioner with refrigerant R-134a as the working fluid is used to keep the room at 23oC by rejecting waste heat to the outdoor at 37oC. The room gains heat through the walls and the windows at a rate of 250 kJ/min while the heat generated by the computer, TV, and lights amounts to 900 W. The refrigerant enters the compressor at 400 kPa as a saturated vapor at a rate of 100 L/min and leaves at 1200 kPa and 70oC. Determinea) The actual COP,b) The maximum COP,c) The minimum volume flow rate of the refrigerant at the compressor inlet for the same compressor inlet and exit conditions.
As you may have learned when studying the properties of thermal energy, building contractors often install double-glazed windows to prevent thermal energy (\"heat\") from entering/exiting the building, find the shift in path ?x as the light enters ..
Suppose that the volume of hydrogen gas at STP collected at the cathode in an electrolysis experiment is 8 mL. How many electrons contributed to the electrolytic current
The weight of a metal bracelet is measured to be 0.100 Newton in air and 0.092 Newton when immersed in water. Calculate its density
You are pushing a refrigerator across the floor of your kitchen. You exert a horizontal force of 318 N for 7.2 s, What is the work done by friction
Freight trains can produce only relatively small acceleration and decelerations. How far will it travel in each case
question a simple harmonic oscillator takes 3.0 seconds to undergo 30 complete vibrations. find the frequency in hz
A car moving at a constant speed of 7.5 m/s, moves 25 m at a 20 degree angle above horizontal. How much time does it take the car to accomplish this movement
An automobile engine with an efficiency 0.21 dumps heat to the environment at the rate of 460 kW. What's its mechanical power output in W? What's its mechanical power output
A pistol that fires a signal flare gives it an initial velocity (muzzle velocity) of 134 m/s at an angle of 57.1 degree above the horizontal. Find the flare's maximum height
An automobile accelerates from rest a 2.0 m/s2 for 20s.The speed is then held constant for 20 s, after which there is anacceleration of -3.0m/s2 until the automobilestops. What is the total distance traveled?
A 2.00-g charged particle is released from rest in a region that has a uniform electric field vector E = (590 N/C) i hat. After traveling a distance of 0.470 m in this region, the particle has a kinetic energy 0.150 J.
An uncharged capacitor has parallel plates 4.6cm on a side, spaced 1.6mm apart. How much work is required to transfer
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