This topic contains a solution. Click here to go to the answer

Author Question: What makes refrigerators and air conditioners possible, in view of the second law of thermodynamics? ... (Read 30 times)

SO00

  • Hero Member
  • *****
  • Posts: 568
What makes refrigerators and air conditioners possible, in view of the second law of thermodynamics?
 a. The fact that heat naturally moves from cooler regions to hotter ones.
  b. The addition of mechanical work to the system.
  c. The chance occurrences of heat flow from cooler to hotter systems.
  d. The use of electricity, not heat.
  e. The fact that no energy is wasted as heat in this kind of system.

Question 2

What is the approximate efficiency of a contemporary steam engine (such as one that drives an electric generator in a power plant)?
 a. About 10.
  b. About 35.
  c. Zero.
  d. About 50.
  e. About 61.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

bdobbins

  • Sr. Member
  • ****
  • Posts: 326
Answer to Question 1

b

Answer to Question 2

d




SO00

  • Member
  • Posts: 568
Reply 2 on: Jul 28, 2018
Great answer, keep it coming :)


nyrave

  • Member
  • Posts: 344
Reply 3 on: Yesterday
Wow, this really help

 

Did you know?

Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.

Did you know?

Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.

Did you know?

The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.

Did you know?

Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.

Did you know?

IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.

For a complete list of videos, visit our video library