« previous next »

Author Question: Two charges, each of charge q, are separated by a distance d. The distance between the charges is ... (Read 87 times)

penguins

  • Hero Member
  • *****
  • Posts: 903
on: Jul 28, 2018
Two charges, each of charge q, are separated by a distance d. The distance between the charges is doubled. If the original potential energy of the arrangement was 40 mJ, by how much does the potential energy change when the charges are moved to the increased distance?
 a. It decreases by more than 20 mJ.
  c. More information is needed. b. It decreases by less than 20 mJ
  d. It decreases by 20 mJ.

Question 2

A railroad freight car, mass 15,000 kg, is allowed to coast along a level track at a speed of 2.0 m/s. It collides and couples with a 60,000-kg loaded second car, initially at rest and with brakes released. What percentage of the initial kinetic energy of the 15,000-kg car is preserved in the two-coupled cars after collision?
 a. 20
  c. 86
  b. 23
  d. 100


Zebsrer

  • Sr. Member
  • ****
  • Posts: 284
Reply #1 on: Jul 28, 2018
Answer to Question 1

A

Answer to Question 2

A


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

Did you know?

Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.

Did you know?

There are approximately 3 million unintended pregnancies in the United States each year.

Did you know?

Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

Did you know?

There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.

Global positioning systems determine latitude, longitude, and altitude by measuring the distance fro Global positioning systems determine latitude, longitude, and altitude by measuring the distance fro
Having a time zone map located near the telephone will assist you when making long distance calls ou Having a time zone map located near the telephone will assist you when making long distance calls ou
In Chuck Close's portrait, the face is quite recognizable when viewed from a distance. Close ... In Chuck Close's portrait, the face is quite recognizable when viewed from a distance. Close ...
The inverse-square law and its effects. Doubling your distance away from a radioactive material ... The inverse-square law and its effects. Doubling your distance away from a radioactive material ...
A late stage in mitosis after the chromosomes (stained blue) have separated A late stage in mitosis after the chromosomes (stained blue) have separated
1) (a) What is Coulomb?s Law? (b) Find the net electrostatic force on the charge labeled ?P? in ... 1) (a) What is Coulomb?s Law? (b) Find the net electrostatic force on the charge labeled ?P? in ...
Video: Introduction to Macular Degeneration

For a complete list of videos, visit our video library