Venus is a planet in the Solar System. The following data are given:
Orbital period of Venus = 225 days
Orbital period of Earth = 365 days
(1) Calculate the ratio orbital radius of Earthorbital radius of Venus.
(2) Explain how observations of the motion of the planets allow scientists to determine the mass of the Sun.
(3) The difference between the maximum and minimum Earth–Sun distances is 5.0×109 m. The difference in gravitational potential due to the Sun between these positions is 3.0×107 J kg−1. Estimate the average gravitational field strength due to the Sun at the position of Earth.