Compare distance and displacement

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)

How many neutrons does plutonium -196 with an atomic number of 78.