This topic contains a solution. Click here to go to the answer

Author Question: What is the meaning of the solar constant? A) the regularity of the 11-year sunspot cycle B) the ... (Read 79 times)

ss2343

  • Hero Member
  • *****
  • Posts: 548
What is the meaning of the solar constant?
 
  A) the regularity of the 11-year sunspot cycle
  B) the amount of energy the Earth receives per unit area and unit time
  C) the stability of the Sun's luminosity for as long as life has existed on Earth
  D) the fact that features on the Sun appear to never change
  E) the fact that the amount of hydrogen turning into helium in the core is fixed

Question 2

Ptolemy was important in the history of astronomy because he ________.
 
  A) was the first to believe that all orbits are perfect circles
  B) was the first to create a model of the solar system that placed the Sun rather than the Earth at the center
  C) developed the first scientific model of the universe
  D) developed a model of the solar system that made sufficiently accurate predictions of planetary positions to remain in use for many centuries



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

gabrielle_lawrence

  • Sr. Member
  • ****
  • Posts: 353
Answer to Question 1

B

Answer to Question 2

D





 

Did you know?

Persons who overdose with cardiac glycosides have a better chance of overall survival if they can survive the first 24 hours after the overdose.

Did you know?

The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.

Did you know?

The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

Did you know?

The horizontal fraction bar was introduced by the Arabs.

Did you know?

To combat osteoporosis, changes in lifestyle and diet are recommended. At-risk patients should include 1,200 to 1,500 mg of calcium daily either via dietary means or with supplements.

For a complete list of videos, visit our video library