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 30 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?

Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.

Did you know?

Vital signs (blood pressure, temperature, pulse rate, respiration rate) should be taken before any drug administration. Patients should be informed not to use tobacco or caffeine at least 30 minutes before their appointment.

Did you know?

Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

Did you know?

Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

Did you know?

According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.

Plants Plants
Plants Plants
Plants Plants
Plants Plants
A farmer with a pitchfork, wearing a hat identifying him as a Granger, warns of an oncoming “Consoli A farmer with a pitchfork, wearing a hat identifying him as a Granger, warns of an oncoming “Consoli
To search for the Native American family would be fruitless. There are rural, urban, single-parent, ... To search for the Native American family would be fruitless. There are rural, urban, single-parent, ...
Video: Methods that regulate pH

For a complete list of videos, visit our video library