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Author Question: A copper cable needs to carry a current of 200 A with a power loss of only 1.5 W/m. What is the ... (Read 87 times)

PhilipSeeMore

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on: Jul 28, 2018
A copper cable needs to carry a current of 200 A with a power loss of only 1.5 W/m. What is the required radius of the copper cable? (The resistivity of copper is 1.7  10-8 Wm.)
 a. 4.0 cm
  c. 0.85 cm
  b. 0.21 cm
  d. 1.2 cm

Question 2

The Earth's density increases with depth. If instead the Earth had uniform density, but the same angular velocity and mass, how would its rotational kinetic energy compare to the actual value?
 a. It would be the same as the actual value.
  b. It would be less than the actual value.
  c. It would be greater than the actual value.
  d. More information is needed to find the answer.


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johnpizzaz

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Reply #1 on: Jul 28, 2018
Answer to Question 1

D

Answer to Question 2

C


PhilipSeeMore

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Reply #2 on: Jul 28, 2018
Thank you!


johnpizzaz

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Reply #3 on: Jul 28, 2018
Always glad to help...


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