« previous next »

Author Question: The density of the Universe is a. equal to the critical density if the Universe is closed. b. ... (Read 37 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?

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?

The U.S. Pharmacopeia Medication Errors Reporting Program states that approximately 50% of all medication errors involve insulin.

Did you know?

If you use artificial sweeteners, such as cyclamates, your eyes may be more sensitive to light. Other factors that will make your eyes more sensitive to light include use of antibiotics, oral contraceptives, hypertension medications, diuretics, and antidiabetic medications.

Did you know?

Medications that are definitely not safe to take when breastfeeding include radioactive drugs, antimetabolites, some cancer (chemotherapy) agents, bromocriptine, ergotamine, methotrexate, and cyclosporine.

Did you know?

Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.

Observable Universe Before and After Inflation Observable Universe Before and After Inflation
The Critical Weather Maker: Atmospheric Stability The Critical Weather Maker: Atmospheric Stability
Cell Grown in 15N and 14 N: Graph of Relative DNA Concentration Vs. the Density Cell Grown in 15N and 14 N: Graph of Relative DNA Concentration Vs. the Density
Population Density versus Economic Growth Population Density versus Economic Growth
Time Line for Evolution of the Universe Time Line for Evolution of the Universe
Physics - Density and Pressure Physics - Density and Pressure
Video: Carbon fixing adaptations Animation

For a complete list of videos, visit our video library