A saturn year is `29.5` times the earth year. How far is the saturn from the sun if the earth is `1.50×10^8km` away from the sun?

A geostationary satellite orbits the earth at a height of nearly 36,000km from the surface of the earth. What is the potentional due to earth's gravity at the site of this sattelite? (Take the potential energy at infinity to be zero). Mass of the earth=6×10^24kg ., radius of earth=6,400km .

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)