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afg_91320
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Homework Statement
Two spheres are cut from a certain uniform rock. One has a radius 4.50cm. The mass of the
other is 5 times greater. Find its radius
Homework Equations
r1 = 4.50cm
r2 = ? when mass is 5x greater
The Attempt at a Solution
Looking at this problem I first thought of somehow integrating the volume of a sphere
which is 4/3[tex]\pi[/tex]r3. But then i though i was just thinking too hard. it made more sense for the radius to be 5x the radius as i figure the mass was proportional to the radius.
so: r2 = 5(4.50cm) = 22.5cm
however i got this marked wrong as the answer was 7.69 cm. what wasn't I looking at clearly?