"No fuel is required for satellite to revolve round earth. But fuel required for aeroplane". Why?

A satellite is revolving round the earth in circular orbit

A satellite is revolving round the earth in circular orbit

An artificial satellite resolves in its orbit around the earth without any fuel. But on aeroplane requires fuel to fly at a certain height. Why So ?

The ratio of energy required to raise a satellite to a height h above the earth surface to that required to put it into the orbit is

The ratio of energy required to raise a satellite to a height h above the earth surface to that required to put it into the orbit is

Compute the additional velocity required by a satellite orbiting around earth with radius 2R to become free from earth's gravitational field. Mass of earth is M.

A satellite is revolving around the earth. Ratio of its orbital speed and escape speed will be.

An artifical satellite revolves in its orbit around the earth without using any fuel. But an aeroplane requires fuel to fly at a certain height . Why So ?

Fuel wood required per person per day is

A satellite is revolving round the earth at a height (R/2) from surface of earth in circular orbit. The change ini speed required for the satellite to excape to infinity for the satellite to escape to infinity is: [Take R as radius of earth and M as mass of earth]