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Author Question: During each cycle, a heat engine takes in 4.0 J of heat, does 1.0 J of work, and expels 3.0 J of ... (Read 63 times)

ENagel

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on: Jul 29, 2018
During each cycle, a heat engine takes in 4.0 J of heat, does 1.0 J of work, and expels 3.0 J of heat. What is its efficiency?
 
  What will be an ideal response?

Question 2

A blacksmith is flattening a steel plate having dimensions 10 cm  15 cm  1 mm. He has heated the plate to 900 K. If the emissivity of the plate is 0.75,
 
  at what rate does it lose energy by radiation? Ignore any heat exchange with the surroundings. ( = 5.67  10-8 W/m2  K4 )
  A) 360 W
  B) 760 W
  C) 790 W
  D) 850 W
  E) 880 W


cdmart10

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

25

Answer to Question 2

D


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