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

Author Question: What is the magnitude of a the vertical electric field that will balance the weight of a plastic ... (Read 46 times)

cnetterville

  • Hero Member
  • *****
  • Posts: 547
on: Jul 29, 2018
What is the magnitude of a the vertical electric field that will balance the weight of a plastic sphere of mass that has been charged to -3.0 nC? (k = 1/40 = 9.0  109 N  m2/C2)
 
  A) 6.9  106 N/C
  B) 7.8  105 N/C
  C) 1.5  106 N/C
  D) 2.1  106 N/C

Question 2

A person uses corrective glasses of power -8.5 D that are worn 2.0 cm from her eye.
 
  (a) Is she nearsighted or farsighted?
  (b) What is her far point without glasses?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

trog

  • Sr. Member
  • ****
  • Posts: 343
Reply #1 on: Jul 29, 2018
Answer to Question 1

A

Answer to Question 2

(a) nearsighted (b) 14 cm


cnetterville

  • Hero Member
  • *****
  • Posts: 547
Reply #2 on: Jul 29, 2018
Both answers were spot on, thank you once again


trog

  • Sr. Member
  • ****
  • Posts: 343
Reply #3 on: Jul 29, 2018
Great! Please up vote :D


« previous next »
 

Did you know?

Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

Did you know?

Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

Did you know?

People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

Did you know?

Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

Did you know?

No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.

Engine and electric motor for the Toyota Prius Engine and electric motor for the Toyota Prius
Uranus's aurorae against its equatorial rings, imaged by the Hubble telescope. Unlike the auror Uranus's aurorae against its equatorial rings, imaged by the Hubble telescope. Unlike the auror
The same star field photographed with (a) a ground-based telescope, which is subject to poor seeing The same star field photographed with (a) a ground-based telescope, which is subject to poor seeing
Magnitude of Geologic Time Magnitude of Geologic Time
Acid–Base Balance Acid–Base Balance
Acid–Base Balance Acid–Base Balance
Video: Parkinson's Disease

For a complete list of videos, visit our video library