Kepler and the Comet

susan__t

1. The problem statement, all variables and given/known data

A comet is 10 times farther from the sun than the Earth. Find the time it take to make its orbit around the sun.

2. Relevant equations
T^2/R^3 = K
K= 3.36X10^18


3. The attempt at a solution

I tried to create a ratio, but I honestly have no idea where to start. I'm not even sure I need to know kepler's constant for this problem. and the answer is T=31.6

I don't know what to put as R, and that leaves me with two variables, R and T.
I also don't know if Kepler's constant is the same for the comet and the earth.

Kurret

since k is equal for both objects, you can set each objects time^2/distance^3 ratio equal to eachother. Then use that [tex]R_{comet}=10R_{earth}[/tex].