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Author Question: Observer A sees a ruler moving by in a relativistic train and measures its length to be LA. Observer ... (Read 113 times)

dbose

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on: Jul 29, 2018
Observer A sees a ruler moving by in a relativistic train and measures its length to be LA. Observer B moves together with the train and measures the length of the ruler to be LB. These two results will be such that
 
  A) LA > LB.
  B) LA = LB.
  C) LA < LB.
  D) LA could be greater or smaller than LB depending on the direction of the motion.

Question 2

A refrigerator has a COP of 2.5. If it removes 7.7 MJ of heat in 25. minutes,
 
  (a) what is the minimum power motor to operate the refrigerator?
  (b) what is its efficiency if it were a reversible engine?


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milbourne11

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Reply #1 on: Jul 29, 2018
Answer to Question 1

C

Answer to Question 2

(a) 2.1 kW
(b) 29. efficiency


dbose

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Reply 2 on: Jul 29, 2018
Excellent

Joy Chen

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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