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Author Question: A reversible engine takes in 555. Joules per second and exhausts 482. watts. (a) How much power ... (Read 105 times)

fox

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on: Jul 27, 2018
A reversible engine takes in 555. Joules per second and exhausts 482. watts.
 
  (a) How much power does it produce?
  (b) What is its efficiency?
  (c) If operated in reverse as a refrigerator, what would be its COP?

Question 2

If the communication lifetime of civilizations in our galaxy is 100 million years and our galaxy is 13 billion years old, what is the chance of us detecting another intelligent civilization now?
 
  A) 1 in 1,300,000
  B) 1 in 13
  C) 1 in 1300
  D) 1 in 130


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dpost18

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

(a) 73. watts
(b) 13.2
(c) 6.60

Answer to Question 2

C


fox

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Reply #2 on: Jul 27, 2018
Thanks


dpost18

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Reply #3 on: Jul 27, 2018
Welcome :)


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