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Author Question: Two objects are placed in a room with a temperature of 20C. Object A has a temperature of 70C, while ... (Read 58 times)

Themember4

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on: Jul 29, 2018
Two objects are placed in a room with a temperature of 20C. Object A has a temperature of 70C, while object B has a temperature of 140C. They have the same emissivity, but different areas.
 
  What should the ratio of the area of object A to that of object B be if the net power emitted by both objects is the same? A) 2.0
  B) 3.4
  C) 5.2
  D) 17
  E) 21

Question 2

A 55-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.30. A 140-N force is applied to the box. What is the frictional force on the box?
 
  What will be an ideal response?


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31809pancho

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

B

Answer to Question 2

140 N


Themember4

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Reply 2 on: Jul 29, 2018
Wow, this really help

Joy Chen

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

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