Posted by jennifer on Wednesday, April 18, 2012 at 8:48pm.
weight = k r^3 , where k is a constant
when r = 2, weight = 5.6
5.6 = k(2^3)
k = 5.6/8 = .7
so weight = .7r^3
when r = 3
weight = .7(27) = 18.9
or ... just use a ratio
w/5.6 = 3^3/2^3
w = 5.6(27/8) = 18.9
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