SOLUTION: The weight of a sphere is proportional to its radius cubed. If a sphere of diameter 1 cm has a mass of 4 grams, what diameter sphere has a mass of 108 grams?

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Question 667722: The weight of a sphere is proportional to its radius cubed. If a sphere of diameter 1 cm has a mass of 4 grams, what diameter sphere has a mass of 108 grams?
Answer by mananth(16946)   (Show Source): You can put this solution on YOUR website!

where k is the constant of proportionality
mass 4 gm radius = 1/2cm


k=32
mass = 108
k= 32
r=?




take the cube root
3/2 = r
r= 1.5 cm
diameter is twice the radius.

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