Explain how a satellite can remain in orbit around the Earth ...

[BRWH]

Explain how a satellite can remain in orbit around the Earth without the expenditure of fuel.
 
  What will be an ideal response?

Question 2

O-type stars in our galaxy are
 
  A) very common, making up about 50 of the total
  B) fairly common (several percent)
  C) very rare (less than 1)
  D) the most common type of stars in our galaxy (75 or more)

[LegendaryAnswers]

Answer to Question 1

The gravitational force on the satellite acts toward the Earth inward along the radius of the satellite's orbit. The satellite's displacement at any moment is tangent to the circular orbit, in the direction of its velocity, perpendicular to the radius and perpendicular to the force of gravity. Therefore, the work done by gravity is zero. Hence, no work needs to be done against the force of gravity.

Answer to Question 2

C

[BRWH]

Excellent

[momolu]

Gracias!