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January 30, 2015

January 30, 2015

Posted by **Z32** on Friday, August 27, 2010 at 12:27am.

- Physics -
**drwls**, Friday, August 27, 2010 at 5:47amTo have the same weight and mass, the product of Radius^3 and density must be the same for the aluminum and iron spheres.

Let subscript 1 be Al and subscript 2 be iron.

R1^3*(density1) = R2^3*(density2)

(R1/R2)^3 = 7.86/2.70 = 2.911

R1/R2 = cube root of 2.911 = 1.428

R1 = 1.40*1.428 = 2.00 meters

(using three significnant figures)

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