A copper cable needs to carry a current of 200 A with a power ...

[PhilipSeeMore]

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.

[johnpizzaz]

Answer to Question 1

D

Answer to Question 2

C

[PhilipSeeMore]

Thank you!

[johnpizzaz]

Always glad to help...