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

Author Question: Define efficiency. Give an example. ... (Read 35 times)

neverstopbelieb

  • Hero Member
  • *****
  • Posts: 534
on: Jul 28, 2018
Define efficiency. Give an example.

Question 2

A large, metallic, spherical shell has no net charge. It is supported on an insulating stand and has a small hole at the top. A small tack with charge Q is lowered on a silk thread through the hole into the interior of the shell. The tack is now allowed to touch the interior surface of the shell. After this contact, what is the charge on the tack?
  1.Q
  2.Q/2
  3.0
  4.-Q/2
  5.-Q


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

akemokai

  • Sr. Member
  • ****
  • Posts: 347
Reply #1 on: Jul 28, 2018
Answer to Question 1

Efficiency is the ratio of the work output to the work input. Example: The work input
to a machine is 50 N m  and the work output is 40 N m  . The efficiency is 40 50 , or
80 percent.

Answer to Question 2

3


neverstopbelieb

  • Member
  • Posts: 534
Reply 2 on: Jul 28, 2018
:D TYSM

aruss1303

  • Member
  • Posts: 314
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.

Did you know?

Although not all of the following muscle groups are commonly used, intramuscular injections may be given into the abdominals, biceps, calves, deltoids, gluteals, laterals, pectorals, quadriceps, trapezoids, and triceps.

Did you know?

The Centers for Disease Control and Prevention has released reports detailing the deaths of infants (younger than 1 year of age) who died after being given cold and cough medications. This underscores the importance of educating parents that children younger than 2 years of age should never be given over-the-counter cold and cough medications without consulting their physicians.

Did you know?

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

Did you know?

Excessive alcohol use costs the country approximately $235 billion every year.

Fossils Give Us a View of Past Life Fossils Give Us a View of Past Life
How to give a Lovenox injection How to give a Lovenox injection
Fortified foods can give your diet a vitamin boost Fortified foods can give your diet a vitamin boost
Using the measuring device to give the correct dose to children Using the measuring device to give the correct dose to children
Production efficiency vs. trophic efficiency Production efficiency vs. trophic efficiency
Give the expression for Kf for Co(SCN)42-. Give the expression for Kf for Co(SCN)42-.
Video: Glucose Evaluation Procedure

For a complete list of videos, visit our video library