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 47 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?

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?

Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

Did you know?

Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.

Did you know?

There are more sensory neurons in the tongue than in any other part of the body.

Did you know?

Blood is approximately twice as thick as water because of the cells and other components found in it.

Energy Chart Energy Chart
Solar Energy Solar Energy
Energy in SHM Energy in SHM
Energy Balance Is Achieved When Energy (Calories) In Equals Energy (Calories) Out Energy Balance Is Achieved When Energy (Calories) In Equals Energy (Calories) Out
Problem Solving – Energy Changes in Chemical Reaction Problem Solving – Energy Changes in Chemical Reaction
Expressing amounts of energy in different energy units is necessary to solve many chemistry ... Expressing amounts of energy in different energy units is necessary to solve many chemistry ...
Video: Conjunctivitis

For a complete list of videos, visit our video library