Posted by **Anonymous** on Thursday, November 13, 2008 at 2:02am.

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.

- physics - density -
**drwls**, Thursday, November 13, 2008 at 2:15am
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)]

- physics - density -
**alexa**, Saturday, October 17, 2009 at 5:07pm
how do fish use density in their lives?

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