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 27 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?

Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.

Did you know?

Glaucoma is a leading cause of blindness. As of yet, there is no cure. Everyone is at risk, and there may be no warning signs. It is six to eight times more common in African Americans than in whites. The best and most effective way to detect glaucoma is to receive a dilated eye examination.

Did you know?

Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.

Did you know?

Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

Did you know?

The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.

Paland and Lynch demonstrated the importance of sexual reproduction in reducing the frequency of mal Paland and Lynch demonstrated the importance of sexual reproduction in reducing the frequency of mal
Plants Plants
Nanotubes and Plants Nanotubes and Plants
Find the voltage, current and power for each resistor in the circuit below Find the voltage, current and power for each resistor in the circuit below
Experiments showing that long- or short-day plants flower in response to night length. Each horizont Experiments showing that long- or short-day plants flower in response to night length. Each horizont
Determination of the genotype of F2 plants by the production of F3 progeny Determination of the genotype of F2 plants by the production of F3 progeny
Video: Phases of the ovarian cycle

For a complete list of videos, visit our video library