A rectangular prism of volume #84# #cm^3# has a mass of #760# #g#. What is the density of the rectangular prism?

1 Answer
anor277
Jun 11, 2016

#"Density, "rho# #=# #"Mass"/"Volume"#

Explanation:

#rho# #=# #(760*g)/(84*cm^3)# #~=# #10*g*cm^-3# to a first (very rough) approx.

Doing the calculations this way, i.e. with the units included, is a check on the validity of our calculations.

I wanted an answer with units of density, #g*cm^-3#, the calculation gave me answer with such units.

If I got an answer in #cm^3*g^-1# or something similar this persuades me that I have ballsed up the calculation, i.e. mulitplied when I should have divided or vice versa. This is all too easy to do, and all of us have done it.

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