if the distance between the Earth and the sun is 1.4986 * 10 ^ 11 m and mass of the sun is 1.998 * 10 ^ 30 kg determine the period of revolution of the Earth round the sun in seconds and then in days gravitational constant is equals to 6.673 times 10 ^ - 11 nm^ 2 kg ^ -2 acceleration due to gravity equals to 10 m/s​