You made a typo. Volume sphere = (4/3)*pi*r^3
Using the volume, calculate the volume of the sphere, then density = mass/volume
Post your work if you get stuck.
The proton has a radius of approximately 1.0×10−13 cm and a mass of 1.7×10−24 g.
Determine the density of a proton. For a sphere V=(43)πr3.
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