An artificial satellite is revolving around the earth without using any fuel. On the other hand an aeroplane requires fuel to fly. Why?

An artificial satellite is revolving around a planet fo mass M and radius R, in a circular orbit of radius r. From Kepler's third law about te period fo a satellite around a common central bdy, square of the period of revolution T is proportional to the cube of the radius of the orbit r. Show usingn dimensional analysis, that T = k/R sqrt((r^3)/(g)) , where k is a dimensionless constant and g is acceleration due to gravity.

The satellite that revolves in polar orbit around the earth is called a______ satellite.

What provides the centripetal force to a satellite revolving around the earth?

A body has a sense of weightlessness in a satellite revolving round the earth.Why?

An artificial satellite is moving in a circular path orbit of radius 42,250 km. Calculate its speed if it takes 24 hours to revolve around the earth.

Answer the following :- An artificial satellite orbiting the earth in very thin atmosphere loses its energy gradually due to dissipation against atmospheric resistance, however small. Why then does its speed increase progressively as it comes closer and closer to the earth ?