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

Author Question: A 1200 W hair dryer used for 10 minutes uses as much energy as a 1000 W hair dryer run 12 minutes. ... (Read 74 times)

CQXA

  • Hero Member
  • *****
  • Posts: 546
on: Jul 28, 2018
A 1200 W hair dryer used for 10 minutes uses as much energy as a 1000 W hair dryer run 12 minutes.
 
  What will be an ideal response?

Question 2

Lighting is a place where lots of energy can be saved.
 
  What will be an ideal response?


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 28, 2018
Answer to Question 1

This is correct: the power of 1200 W in the first case used for 10 min (600 s),
giving an energy use PDt = (1200 W)(600 s) = 720,000 J. In the second case, the power is
1000 W but the time is 12 min (720 s), giving an energy use of PDt = (1000 W)(720 s) =
720,000 J, exactly the same.

Answer to Question 2

Lighting uses up to 7.5 of total energy use. Much energy (and money) can be
saved in lighting.


CQXA

  • Hero Member
  • *****
  • Posts: 546
Reply #2 on: Jul 28, 2018
TY


kingdude89

  • Sr. Member
  • ****
  • Posts: 336
Reply #3 on: Jul 28, 2018
You're welcome


« previous next »
 

Did you know?

A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.

Did you know?

Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.

Did you know?

There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

Did you know?

An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

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.

Metabolic pathways involved in the breakdown of proteins for energy. Metabolic pathways involved in the breakdown of proteins for energy.
Get feedback every 5 to 7 minutes about heat intensity. Add or subtract heat barriers to maintain ... Get feedback every 5 to 7 minutes about heat intensity. Add or subtract heat barriers to maintain ...
Locations of key energy meridians and acupoints for the back, shoulder, arm, neck, head, and face. Locations of key energy meridians and acupoints for the back, shoulder, arm, neck, head, and face.
Animated The one-way flow of energy and cycling of materials in the world of life Animated The one-way flow of energy and cycling of materials in the world of life
The mitochondrion is the center of energy transformation in the cell The mitochondrion is the center of energy transformation in the cell
Annual Energy Flow: Silver Springs Annual Energy Flow: Silver Springs
Video: Embryonic development - Week 3

For a complete list of videos, visit our video library