SOLUTION: an alloy was machined into a flat disk 31.5 mm in diameter and 4.5 mm thick. a hole 7.5 mm in diameter was drilled through the center. the disk weighed 20.2 g. what was the density

Question 893227: an alloy was machined into a flat disk 31.5 mm in diameter and 4.5 mm thick. a hole 7.5 mm in diameter was drilled through the center. the disk weighed 20.2 g. what was the density of the alloy in SI units?
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Find the volume of the new part.
The volume is the difference of the two circular areas multiplied by the thickness.

Converting to ,

The mass in kg would be

So the density is,

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