Expert: Ed - 8/7/2009

Question
Can you please help me with this question, and show me step by step how it's done if possible. (I'm totally baffeled!!!!)
Thank you- Amanda

the distance from the earth to the sun is 1.5x10^11m and the Mass of the is 1.9x10^30kg
use Kepler's Law of Periods to find the period of the earth's orbit, recorded in seconds:;

show how to express your answer in years;  

Answer
Amanda, you don't say, in your question, which object has a mass of 1.9 times 10 to the 30th kg.  (it's the sun).  Is that why you're having problems?

You should get 3.1 * 10^7 if you are solving for seconds.

Do you know what G is??
http://en.wikipedia.org/wiki/Gravitational_constant

Use this formula.

G · m · t² = 4 · π² · r³

I have to go.

--Ed