This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: American power plants usually supply 120 V ac. (a) At what frequency is this voltage supplied? ... (Read 32 times)

SGallaher96

  • Hero Member
  • *****
  • Posts: 509
on: Jul 29, 2018
American power plants usually supply 120 V ac.
 
  (a) At what frequency is this voltage supplied?
  (b) What is the maximum voltage?

Question 2

A galaxy is observed receding from Earth with a speed of 2800 km/s.
 
  If the Hubble constant is 22 km/s per million light-years, estimate how many years ago the light that we presently see from the galaxy actually left the galaxy. (c = 3.00  108 m/s, 1 ly = 9.461  1015 m, 1 y = 3.156  107 s)
  A) 1.4  107 y B) 4.2  107 y C) 4.2  108 y D) 4.2  106 y E) 1.3  108 y


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

kingdude89

  • Sr. Member
  • ****
  • Posts: 336
Reply #1 on: Jul 29, 2018
Answer to Question 1

(a) 60 Hz (b) 170 V (120 V is the rms voltage)

Answer to Question 2

E


SGallaher96

  • Hero Member
  • *****
  • Posts: 509
Reply #2 on: Jul 29, 2018
Both answers were spot on, thank you once again


kingdude89

  • Sr. Member
  • ****
  • Posts: 336
Reply #3 on: Jul 29, 2018
Great! Please up vote :D


« previous next »
 

Did you know?

According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.

Did you know?

The average adult has about 21 square feet of skin.

Did you know?

All adverse reactions are commonly charted in red ink in the patient's record and usually are noted on the front of the chart. Failure to follow correct documentation procedures may result in malpractice lawsuits.

Did you know?

Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.

Did you know?

All patients with hyperparathyroidism will develop osteoporosis. The parathyroid glands maintain blood calcium within the normal range. All patients with this disease will continue to lose calcium from their bones every day, and there is no way to prevent the development of osteoporosis as a result.

Gross food? Or an American MASTERPIECE? Gross food? Or an American MASTERPIECE?
Plants Plants
American soldiers—some of them regulars in deep blue uniforms, others in buckskin cowboy outfits— fi American soldiers—some of them regulars in deep blue uniforms, others in buckskin cowboy outfits— fi
Testing the arterial supply to the lower extremities Testing the arterial supply to the lower extremities
Blood Supply of the Liver Blood Supply of the Liver
What is the frequency of individuals that are homozygous for this allele? What is the frequency of individuals that are homozygous for this allele?
Video: Types of antimicrobial substances (interferons & complement protein)

For a complete list of videos, visit our video library