ABSTRACT
The thrust imparted by the rocket engine is to overcome the drag forces and accelerate/decelerate the vehicle and change its direction in a controlled manner. The thrust produced by the rocket motor usually acts in the opposite direction of the high-temperature, high-pressure gas that expands and exits from the rocket nozzle. When the rocket vehicle flies nearer the earth's surface, the gravitational pull of other distant heavenly bodies is small enough to be neglected. When the rocket is fired vertically, both the drag force and gravitational force acting on the rocket engine can be neglected. In an actual rocket vehicle, the flight trajectory can be three-dimensional in nature. If a satellite is placed in an equatorial orbit along the line of the earth's equator, it is called an equatorial orbit. It is important to place the satellite which can rotate around the earth in its equatorial plane at the same angular velocity as the earth.
