« previous next »

Author Question: The density of the Universe is a. equal to the critical density if the Universe is closed. b. ... (Read 75 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?

Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

Did you know?

Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.

Did you know?

Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.

Did you know?

Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

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.

Critical thinking skills Critical thinking skills
APPLYING A STERILE GOWN AND PERFORMING CLOSED GLOVING 4 APPLYING A STERILE GOWN AND PERFORMING CLOSED GLOVING 4
Measure between terminal 30 and 87a. Terminal 87a is the normally closed contact, and there should ... Measure between terminal 30 and 87a. Terminal 87a is the normally closed contact, and there should ...
In plant fossils, stomatal density is used to estimate CO2 concentration in the atmosphere In plant fossils, stomatal density is used to estimate CO2 concentration in the atmosphere
Time Line for Evolution of the Universe Time Line for Evolution of the Universe
Venus Fly Trap closed on a fly Venus Fly Trap closed on a fly
Video: Neural regulation of mechanical digestion- CNS voluntary, ANS & ENS controlled involuntary movements

For a complete list of videos, visit our video library