Question 1205446
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A hollow metal sphere is made of metal 4mm thick and has an external diameter of 12cm. 
If the density of the metal is 8.8g/cm³, What is the mass of the sphere?
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To find the mass, multiply the density by the volume of the metal.


To find the volume of the metal, from the volume of the outer sphere subtract the volume 
of the interior sphere.


    mass = {{{8.8*(4/3)*pi*(R^3-r^3)}}} = {{{8.8*(4/3)*3.14159265*((12/2)^3-((12-2*0.4)/2)^3)}}} = 1488.601 grams.    <U>ANSWER</U>
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