Author Question: One light-year is the distance light travels in one year. The speed of light is about 300,000 km/s . ... (Read 109 times)

SAVANNAHHOOPER23

  • Hero Member
  • *****
  • Posts: 542
One light-year is the distance light travels in one year. The speed of light is about 300,000 km/s . How far is 1 light-year?
 
  A) 1.08 billion km (1,080,000,000, or 1.08  109 km)
  B) 300 thousand km (300,000, or 3  105 km)
  C) 9.46 trillion km (9,460,000,000,000, or 9.46  1012 km)
  D) 18 million km (18,000,000, or 1.8  107 km)

Question 2

What eventually halts the gravitational collapse of an interstellar gas cloud that forms an object that is massive enough to become a star?
 
  A) the central object becoming hot enough to sustain nuclear fusion in its core
  B) a critical fraction of the gas has been driven further into space
  C) nothing; all collapsing gas clouds become black holes
  D) the crowding of electrons in the core



dawsa925

  • Sr. Member
  • ****
  • Posts: 326
Answer to Question 1

C

Answer to Question 2

A



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

SAVANNAHHOOPER23

  • Hero Member
  • *****
  • Posts: 542
Both answers were spot on, thank you once again




 

Did you know?

Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

Did you know?

Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

Did you know?

Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

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?

The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

For a complete list of videos, visit our video library