# A satellite is to be placed in equatorial geostationary orbit around earth for communication.

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A satellite is to be placed in equatorial geostationary orbit around earth for communication.

(a) Calculate height of such a satellite.

(b) Find out the minimum number of satellites that are needed to cover entire earth so that at least one satellites is visible from any point on the equator.

[M = 6 x 1024 kg, R = 6400 km, T = 24h, G = 6.67 x 10-11 SI units]

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(360o/2θ)≈2.2l; Hence minimum number = 3