Asked by Anonymous

A person got a metal rock, he knows this rock density is ρm, but he is worried that there might be a hole within the rock, how he found there is a hole or not? And how he found the fraction of the hole size to total rock size? write your experimental steps.
Answered by drwls
If ñm is the density of the rock with no holes, it can be compared to the actual density of the sample. Measure the volume of the rock, V and its mass, M.

V*ñm - M = missing mass due to hole(s)
= m

m/ñm = v = volume of hole(s)
v/V = fraction of sample that is holes
= (1/V)[m/ñm]
= (1/V)(V*ñm - M)/ñm
= 1 - [M/(V*ñm)]
Answered by alexa
how do fish use density in their lives?
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