SOLAR SYSTEM

Detailed explanation-1: -The orbital velocity of the satellite depends on its altitude above Earth. The nearer to Earth, the faster the required orbital velocity. At an altitude of 124 miles (200 kilometers), the required orbital velocity is a little more than 17, 000 mph (about 27, 400 kph).

Detailed explanation-2: -So, we see that as the height (h) of the orbit of a stellite increases, it velocity must decreases.

Detailed explanation-3: -If it is going slowly, it will not go forward enough to counter the pull of gravity and crash into the thing it is orbiting around. Changing speed is one way to change the orbit of a satellite or make a satellite leave orbit.

Detailed explanation-4: -Orbits and changing speed If the force between them is greater, a greater acceleration will occur. The greater the acceleration, the greater the change in velocity-this causes the object to move faster. This means that objects in small orbits travel faster than objects in large orbits.

Detailed explanation-5: -To stay in orbit, a satellite has to travel at a very high velocity, which depends on the height. So, typically, for a circular orbit at a height of 300 km above the Earth’s surface, a speed of 7.8 km/s (28, 000 km/h) is needed. At this speed, the satellite will complete one orbit around the Earth in 90 minutes.