If the density of copper is 8.92 g/cm3, what is the mass of a copper BB (sphere) with a diameter of 4.500 mm?
Given the density of copper is -8.92g/cc
We know the formula of density = mass/ volume
Given the diameter of copper sphere = 4.5mm
Then radius = diameter/2 = 0.45mm/2 = 0.225mm
Volume of sphere = 4/3 πr3
therefore volume of copper sphere = 4/3.22/7.(0.225mm)3
=0.0477mm3
We know that 1cc = 1000mm3
Then 0.0477mm3 is how man cc?
= 0.0477×10-3 cc
By substituting this volume of sphere in the density formula we get the mass of copper ball.
= 8.92 g/cc . 0.0477×10-3 cc
= 0.43×10-3g
= 0.43mg
Hence the mass of copper ball is 0.43milli grand.
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