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physics

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The mean distance of the planet Neptune from the Sun is 30.05 times the mean distance of Earth from the Sun.
a.) Determine how many Earth-years it takes Neptune to orbit the Sun.
b.) The mass of the Sun is 1.99 x 10^30 kg, and the closest distance of Neptune from the Sun is 4.44 x 10^9 km. What is the orbital speed of Neptune in mph at this point?
c.) Without doing any numerical calculations, answer the following. Is the orbital speed of Earth less than, equal to, or greater than the orbital speed of Neptune? Explain.
d.) The radius of Neptune is 3.883 times that of Earth, and the mass of Neptune is 17.147 times that of Earth. From the surface of which planet (Earth or Neptune) would it be easier to launch a satellite? Explain.

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