Physics, 17.08.2021 17:20 candaceblanton

A window air conditioner uses 1125 W of electricity and has a coefficient of performance of 3.41. For simplicity, let's assume that all of that electrical energy is transformed into work done by the air conditioner to cool a room with dimensions of 7 mx 7 mx 3 m. The air inside this room will initially have the same temperature as the air outside (324 K) and the air conditioner will attempt to cool the room to 295 K. For the purposes of estimation, assume that the air in this room will be cooled at constant volume, that the specific heat of the air at constant volume is 720 J/kg-K, and that the density of the air is 1.2 kg/m^3. Required:
a. How much energy must be transferred out of this room in order to decrease the temperature of the air from 324 K to 295 K?
b. How much work will be done by the air conditioner during the process of cooling the room?
c. How much time in minutes will it take for the room to cool using this air conditioner?

Answers: 3

Show answers

Another question on Physics

Physics, 22.06.2019 10:00

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix.b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds.c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer.d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.

Answers: 1

Answer

Physics, 22.06.2019 16:00

At what time will the interfering waves have an amplitudeof zero?

Answers: 1

Answer

Physics, 23.06.2019 00:00

Does the distance travelled by an oscillating mass between times t=0 and t2 equal the displacement of the particle over the same time period if t2> t/2? hint: consider a sine wave starting at t1=0, then consider a closing wave starting at t1=0, for your explanation.

Answers: 1

Answer

Physics, 23.06.2019 00:30

Which inventor was often called the lady edison

Answers: 1

Answer

You know the right answer?

A window air conditioner uses 1125 W of electricity and has a coefficient of performance of 3.41. Fo...

Questions