Q. 36 A satellite is to be placed in an equatorial geostationary orbit around the earth for communication.

(a) Calculate the height of such a satellite.

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

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