Name the force that keeps a satellite in orbit around the Earth.
A meteorological satellite moves in a circular orbit around the Earth.
Its distance above the Earth's surface is 820 km.
The radius of the Earth is 6370 km. Calculate the radius of the orbit of the satellite in km\text{km}km.
The satellite completes one orbit in 101 minutes101\text{ minutes}101 minutes. Calculate its orbital speed in m/s\text{m/s}m/s.
Another satellite orbits the Earth in an elliptical (non-circular) orbit. Its distance from the Earth and its speed change as it orbits. It travels fastest when it is closest to the Earth. Use ideas about energy to explain why.
The meteorological satellite detects infrared radiation and visible light.
State the name of the type of wave that includes infrared radiation and visible light.
Describe two differences between infrared radiation and visible light.
