This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: You can choose between a heat pump and an electric heater to heat your house. If you assume that the ... (Read 57 times)

abern

  • Hero Member
  • *****
  • Posts: 533
on: Jul 28, 2018
You can choose between a heat pump and an electric heater to heat your house. If you assume that the electric heater is 100 efficient at turning electrical energy into heat, an electric heat pump of what coefficient of performance (COP) will result in the same cost of electricity for the same amount of heating? Assume that the motor that runs the heat pump is 100 efficient.
  1.0.25
  2.0.5
  3.1.0
  4.2.0

Question 2

If a car engine has a thermal efficiency of 50 and it does 500 J of work in one cycle, how much energy does it expel to the cold reservoir each cycle?
   
  1.250 J.
  2.500 J.
  3.750 J.
  4.1000 J.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

aidanmbrowne

  • Sr. Member
  • ****
  • Posts: 305
Reply #1 on: Jul 28, 2018
Answer to Question 1

3

Answer to Question 2

2


abern

  • Member
  • Posts: 533
Reply 2 on: Jul 28, 2018
Gracias!

alvinum

  • Member
  • Posts: 317
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

About 80% of major fungal systemic infections are due to Candida albicans. Another form, Candida peritonitis, occurs most often in postoperative patients. A rare disease, Candida meningitis, may follow leukemia, kidney transplant, other immunosuppressed factors, or when suffering from Candida septicemia.

Did you know?

In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

Did you know?

The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.

Did you know?

About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.

Did you know?

Blood is approximately twice as thick as water because of the cells and other components found in it.

Electric Heating Coil Rectification Electric Heating Coil Rectification
Insulin pump. Insulin pump.
The bleed weep hole in the water pump allows coolant to leak out of the pump and not be forced ... The bleed weep hole in the water pump allows coolant to leak out of the pump and not be forced ...
A single overhead camshaft engine with a timing belt that also rotates the water pump. A single overhead camshaft engine with a timing belt that also rotates the water pump.
A dim headlight indicates excessive resistance in fuel pump circuit. A dim headlight indicates excessive resistance in fuel pump circuit.
Sleeping House of the Nyim Sleeping House of the Nyim
Video: Hormonal regulation of blood pressure - RAA system

For a complete list of videos, visit our video library