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Author Question: The density of aluminum is 2.7 103 kg/m3. The speed of longitudinal waves in an aluminum rod is ... (Read 115 times)

ETearle

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on: Jul 29, 2018
The density of aluminum is 2.7  103 kg/m3. The speed of longitudinal waves in an aluminum rod is measured to be 5.1  103 m/s. What is the value of Young's modulus for aluminum?
 
  A)
 
  7.0  1010 N/m2
  B)
 
  7.0  107 N/m2
  C)
 
  2.2  1011 N/m2
  D)
 
  2.2  109 N/m2
  E)
 
  1.4  107 N/m2

Question 2

The energy stored in the earth's magnetic field with a strength of 0.5  10-4 T in a room 3.0 m by 4.0 m by 2.4 m is
 
  A)
 
  570 mJ.
  B)
 
  29 mJ
  C)
 
  10 mJ.
  D)
 
  100 mJ.
  E)
 
  zero.


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Harbringer

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

A

Answer to Question 2

B


ETearle

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Reply 2 on: Jul 29, 2018
Great answer, keep it coming :)

smrtceo

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Reply 3 on: Yesterday
Gracias!

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