A geosynchronous Earth satellite is one that has an orbital period of precisely 1 day. Such orbits are useful for communication and weather observation because the satellite remains above the same point on Earth (provided it orbits in the equatorial plane in the same direction as Earth's rotation). Calculate the radius of such an orbit based on the data for the moon

r = 4.24x10⁴ km.  

Explanation:

To find the radius of such an orbit we need to use Kepler's third law:

where T₁: is the orbital period of the geosynchronous Earth satellite = 1 d, T₂: is the orbital period of the moon = 0.07481 y, r₁: is the radius of such an orbit and r₂: is the orbital radius of the moon = 3.84x10⁵ km.                                                        

From equation (1), r₁ is:

Therefore, the radius of such an orbit is 4.24x10⁴ km.

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