- #1
vrobins1
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Homework Statement
The escape speed from the surface of the Earth is 11.2 km/s. What would be the escape speed be from another planet of the same density (mass per unit volume) as Earth but with a radius 5 times that of Earth's?
Homework Equations
I know I have to use v=sqrt2GM/R
The Attempt at a Solution
I wasn't really sure how to go about this problem, but I did v1/v2 = 11.2/v2 = sqrt5
So I solved for v2 by doing 11.2/(sqrt5) and I got 5.00879227.
I have tried 5, 5.0, and 5.009 as answer submissions and got them all incorrect. I am not even sure if I am setting the problem up right, so any guidance or hints would be much appreciated. Thanks!