Practice!

Sample Problem

If Saturn is, on average, 9 times farther from the Sun than the Earth is, how long is its year in terms of Earth years?

Solution

We will use the formula (T12) / (r13) = (T22) / (r23) . If we substitute values as we know them, we get 12/13 = x2/93   adius)em, we get s of Earth years?

from the Sun than the Earth is, how much longer is its year?

cause of , so we solve for x and get x = √ (93) = 27