our earth has several artificial satellites but the moon is the only natural satellite. distance to the moon from the Earth is `3.84×10^8m` and the time period of moon's revolution is `27.3` days. obtain the mass of earth. (gravitational constant `G=6.67×10^(-11)Nm^2kg^(-2)`

Our earth has several artificial satellites but the moon is the only natural satellite. How do you explain weightlessness in an artificial satellite?

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.

A person in an artificial satellite of the earth experiences weightlessness. The moon is a natural satellite of the earth. A satellite is revolving very close to the earth. What is the percentage increase in velocity needed to make it escape from the gravitational field of the earth?