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Author Question: How long is a wire made from 200 cm3 of copper if its resistance is 8.5 ohms? The resistivity of ... (Read 63 times)

jayhills49

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on: Jul 28, 2018
How long is a wire made from 200 cm3 of copper if its resistance is 8.5 ohms? The resistivity of copper is 1.7  105 Wm.
 a. 10 m
  c. 7.1 m
  b. 2.2  102 m
  d. 3.0  103 m

Question 2

A rotating flywheel can be used as a method to store energy. If it has 2.0  106 J of kinetic energy when rotating at 400 rad/s, and if a frictional torque of 4.0 Nm acts on the system, in what interval of time would the flywheel come to rest?
 a. 3.5 min
  c. 14 min
  b. 42 min
  d. 21 min


tennis14576

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

A

Answer to Question 2

B


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jayhills49

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Reply #2 on: Jul 28, 2018
Both answers were spot on, thank you once again


tennis14576

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Reply #3 on: Jul 28, 2018
Great! Please up vote :D


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