When an artificial satellite revolves around the earth in a circular orbit, the direction of the satellite is at an angle of
This means that no work is required to be done, and hence, no energy has to be spent. That’s why, an artificial satellite revolves around the earth without using any fuel.
But in order that an airplane flies at a certain height, it has to overcome the force of gravity and air resistance. Also, the direction of the force and motion is not