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Author Question: An object completely submerged in water must either rise or fall. Indicate whether the statement ... (Read 45 times)

tiffannnnyyyyyy

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on: Jul 27, 2018
An object completely submerged in water must either rise or fall.
 
  Indicate whether the statement is true or false

Question 2

Why don't we use efficiency for rating refrigerators, like we rate engines, instead of the Coefficient of Performance?
 
  What will be an ideal response?


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jomama

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Reply #1 on: Jul 27, 2018
Answer to Question 1

FALSE

Answer to Question 2

In both cases we desire a ratio of what we want divided by what it costs; for a refrigerator this is heat absorbed/work input (COP) but for an engine this is work out/heat in (= eff).


tiffannnnyyyyyy

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Reply 2 on: Jul 27, 2018
Wow, this really help

xiaomengxian

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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