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# Answer to Question #71314 in Other Physics for David Atabo

Question #71314
If a spherical metal bob of radius 3cm is fully immersed in a cylinder containing water and the water level rises by 1cm, what is the radius of the cylinder?
1
2017-11-25T09:14:07-0500
When we drop the sphere into the cylinder of water, it sinks to the bottom.
How much water is displaced by the sphere we dropped in?
The volume of a sphere is given by
V_sphere=4/3 πr_sphere^3
Now that we know the amount of water that 'moved', and we know the container holding that water is a right circular cylinder, all we need to know is the formula for the volume of such a cylinder.
V_cylinder=hπr_cylinder^2

Now we can equate those two volumes and solve for r_cylinder
4/3 πr_sphere^3=hπr_cylinder^2
r_cylinder=√((4r_sphere^3)/3h)=√((4×(3)^3)/(3×1))=√(4×3^2 )=2×3=6 cm

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