Calculate the electrical capacitance of earth. The radius of earth is 6400 km.

Calculate the capacitance of earth, taking its radius to be 6.37 xx 10^(6)m

An artificial satellite circulating the earth is at a height 3400km from the surface of the earth, if the radius of the earth is 6400km and g=9.8m/s^2 . calculate the orbital velocity of the satellite.

ATV transmitting antenna is 100 m tall. How much service area can it cover if the receiving antenna is at the ground level? Radius of earth is 6400km.