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October 20, 2014

October 20, 2014

Posted by **jenna** on Tuesday, October 5, 2010 at 12:44am.

- physics -
**drwls**, Tuesday, October 5, 2010 at 12:54amR = outer radius

r = inner radius (of spherical cavity)

Sphere weight = buoyancy force

(4/3) pi (R^3 - r^3)*(density of Al)*g

= (4/3) pi R^3 * (density of water)*g

(4/3) pi R^3 * (density of water)

= 1.22 kg

(Use the second equation to solve for R)

The (4/3) pi g cancels out in the first equation.

1 - (r/R)^3

= (water density)/(Al density)

Look up the densities and solve

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