« previous next »

Author Question: The density of the Universe is a. equal to the critical density if the Universe is closed. b. ... (Read 129 times)

olgavictoria

  • Hero Member
  • *****
  • Posts: 528
on: Jul 27, 2018
The density of the Universe is
 
  a. equal to the critical density if the Universe is closed.
  b. equal to the critical density if the Universe is flat.
  c. greater than the critical density if the Universe is flat.
  d. greater than the critical density if the Universe is open.
  e. None of the other choices are correct.

Question 2

If white dwarfs have exhausted their fuel, why are they hot?
 
  What will be an ideal response?


kalskdjl1212

  • Sr. Member
  • ****
  • Posts: 353
Reply #1 on: Jul 27, 2018
Answer to Question 1

b

Answer to Question 2

When a star collapses into a white dwarf, it converts gravitational energy into thermal energy. Its interior becomes very hot.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

olgavictoria

  • Hero Member
  • *****
  • Posts: 528
Reply #2 on: Jul 27, 2018
Both answers were spot on, thank you once again


kalskdjl1212

  • Sr. Member
  • ****
  • Posts: 353
Reply #3 on: Jul 27, 2018
Great! Please up vote :D


« previous next »
 

Did you know?

The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.

Did you know?

A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

Did you know?

In 1864, the first barbiturate (barbituric acid) was synthesized.

Did you know?

It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.

Did you know?

Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.

Foamy Structure of the Universe Foamy Structure of the Universe
Critical thinking skills Critical thinking skills
Critical Thinking Model Critical Thinking Model
Social Problems: A Critical Power-Conflict Perspective Social Problems: A Critical Power-Conflict Perspective
Physics - Density, Pressure, and Pascal's Principle Physics - Density, Pressure, and Pascal's Principle
Klamath–Siskiyou Forest, a Critical Ecoregion Klamath–Siskiyou Forest, a Critical Ecoregion
Video: Types of Burns

For a complete list of videos, visit our video library