This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: What is the meaning of the solar constant? A) the regularity of the 11-year sunspot cycle B) the ... (Read 28 times)

ss2343

  • Hero Member
  • *****
  • Posts: 548
on: Jul 27, 2018
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
Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

D


ss2343

  • Hero Member
  • *****
  • Posts: 548
Reply #2 on: Jul 27, 2018
TY


gabrielle_lawrence

  • Sr. Member
  • ****
  • Posts: 353
Reply #3 on: Jul 27, 2018
You're welcome


« previous next »
 

Did you know?

Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.

Did you know?

The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

Did you know?

The familiar sounds of your heart are made by the heart's valves as they open and close.

Did you know?

Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

Did you know?

About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.

Photoaging solar elastosis; senile keratosis Photoaging solar elastosis; senile keratosis
The Kingsley plantation, on Fort George Island in Jacksonville, Florida. Zephaniah Kingsley, the own The Kingsley plantation, on Fort George Island in Jacksonville, Florida. Zephaniah Kingsley, the own
Deliberative nursing is a constant process of validating perceptions, thoughts, and feelings. Deliberative nursing is a constant process of validating perceptions, thoughts, and feelings.
Life Cycle Nutrition: Toddlers through the Later Years Life Cycle Nutrition: Toddlers through the Later Years
Chlamydomonas Life Cycle Chlamydomonas Life Cycle
A profile of the nuclear contents of a cell through the mitotic cell cycle A profile of the nuclear contents of a cell through the mitotic cell cycle
Video: Chemical Equilibrium between N2O4 (colorless gas) and NO2 (brown gas)

For a complete list of videos, visit our video library