« previous next »

Author Question: On a cold day, a heat pump absorbs heat from the outside air at 14F (-10C) and transfers it into a ... (Read 403 times)

CharlieWard

  • Hero Member
  • *****
  • Posts: 578
on: Jul 28, 2018
On a cold day, a heat pump absorbs heat from the outside air at 14F (-10C) and transfers it into a home at a temperature of 86F (30C). Determine the maximum COP of the heat pump.
 a. 0.2
  b. 4.4
  c. 0.5
  d. 7.6
  e. 6.7

Question 2

A heat engine absorbs 2 500 J of heat from a hot reservoir and expels 1 000 J to a cold reservoir. When it is run in reverse, with the same reservoirs, the engine pumps 2 500 J of heat to the hot reservoir, requiring 1 500 J of work to do so. Find the ratio of the work done by the heat engine to the work done by the pump. Is the heat engine reversible?
 a. 1.0 (no)
  b. 1.0 (yes)
  c. 1.5 (yes)
  d. 1.5 (no)
  e. 2.5 (no)


succesfull

  • Sr. Member
  • ****
  • Posts: 339
Reply #1 on: Jul 28, 2018
Answer to Question 1

D

Answer to Question 2

B


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.

Did you know?

Approximately 25% of all reported medication errors result from some kind of name confusion.

Did you know?

Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

Did you know?

Patients should never assume they are being given the appropriate drugs. They should make sure they know which drugs are being prescribed, and always double-check that the drugs received match the prescription.

Did you know?

Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.

A thermostat stuck in the open position caused the engine to operate too cold. The vehicle failed ... A thermostat stuck in the open position caused the engine to operate too cold. The vehicle failed ...
Coolant flow through the impeller and scroll of a coolant pump for a V-type engine. Coolant flow through the impeller and scroll of a coolant pump for a V-type engine.
A typical electric motor-driven AIR pump. This unit is on a Chevrolet Corvette and only works when ... A typical electric motor-driven AIR pump. This unit is on a Chevrolet Corvette and only works when ...
Heat Stress and Wind Chill: Indices of Human Discomfort Heat Stress and Wind Chill: Indices of Human Discomfort
A schematic diagram of the functional cycle of the Na+–K+ pump A schematic diagram of the functional cycle of the Na+–K+ pump
Women can express breast milk using a breast pump Women can express breast milk using a breast pump
Video: Causes of Acne

For a complete list of videos, visit our video library