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Author Question: A 100 W lightbulb has an energy efficiency of 5. It is turned on for one minute. During this time, ... (Read 41 times)

maegan_martin

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A 100 W lightbulb has an energy efficiency of 5. It is turned on for one minute. During this time, the visible radiant energy output of the lightbulb is
 
  A) 300 J.
  B) 6000 J.
  C) 5700 J.
  D) impossible to determine because we don't know the voltage.
  E) impossible to determine because we don't know the power.

Question 2

A 25-g string is stretched with a tension of 43 N between two fixed points 12 m apart. What is the frequency of the second harmonic?
 
  A) 18 Hz B) 24 Hz C) 36 Hz D) 12 Hz E) 6.0 Hz



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mohan

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Answer to Question 1

A

Answer to Question 2

D




maegan_martin

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


debra928

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

 

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