- #1
omgitsmonica
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Homework Statement
"Yoda has just discovered planetary system consisting of star Dagobahr and its two planets: Rool and Krau. Planet Rool has average orbital radius 1.6 times as big as planet Krau. If planet Rool orbits Dagobahr in 2.9 Earth years, how long is a year for the resident of Krau? Give the answer in Earth years.
Homework Equations
Trool^2/rRool^3 = TKrau^2/rKrau^3
The Attempt at a Solution
TRool =?
rRool = 1.6*rKrau
Tkrau=2.9
rkrau=?
I have no idea where to go from here...