... radius of its orbit (assumed to be circular)?
A) 8.55 AU
B) 25 AU
C) 1 AU
D) 125AU
a,b,c, or d?
i'm guessing D but i'm not quite sure.
2007-02-28 07:50:08 · 4 answers · asked by expression_11 1 in Science & Mathematics ➔ Astronomy & Space
B) 25 AU
Because Kepler's 3rd law says P^2=A^3, so 125^2=A^3; A=25.
2007-02-28 08:09:08 · answer #1 · answered by campbelp2002 7 · 0⤊ 0⤋
Period squared equals orbital radius cubed if period is in years and radius is in AU: Kepler's third law. Do the rest yourself. (I'm not going to do your homework for you.) And the orbit doesn't have to be circular: the distance you get is the semimajor axis of the elliptical orbit, which is the radius if the orbit is a circle.
2007-02-28 15:59:42 · answer #2 · answered by Faeldaz M 4 · 0⤊ 0⤋
You need Kepler's Third Law of Planetary Motion.
P squared = k(a cubed)
Since you are using years and Astronomical Units, the 'P' value is 125, the 'k' value is 1, and the 'a' is your answer.
a = the cube root of (P squared divided by 1)
get out your calculator
2007-02-28 15:59:03 · answer #3 · answered by sternsheets 2 · 0⤊ 0⤋
For a tenth planet to be discovered, there would need to be a ninth planet. Pluto was demoted from a planet last year.
2007-02-28 15:53:01 · answer #4 · answered by chikkenbone 3 · 0⤊ 1⤋