This topic contains a solution. Click here to go to the answer

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 97 times)

PhilipSeeMore

  • Hero Member
  • *****
  • Posts: 561
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.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

johnpizzaz

  • Sr. Member
  • ****
  • Posts: 345
Answer to Question 1

D

Answer to Question 2

C





 

Did you know?

You should not take more than 1,000 mg of vitamin E per day. Doses above this amount increase the risk of bleeding problems that can lead to a stroke.

Did you know?

Vaccines prevent between 2.5 and 4 million deaths every year.

Did you know?

Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.

Did you know?

Stevens-Johnson syndrome and Toxic Epidermal Necrolysis syndrome are life-threatening reactions that can result in death. Complications include permanent blindness, dry-eye syndrome, lung damage, photophobia, asthma, chronic obstructive pulmonary disease, permanent loss of nail beds, scarring of mucous membranes, arthritis, and chronic fatigue syndrome. Many patients' pores scar shut, causing them to retain heat.

Did you know?

During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.

For a complete list of videos, visit our video library