Volume= Length x Height x thickness = Mass
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Density
So, Thickness = Mass
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Density x Length x Height
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53ft2=49,238.6112sq cm 7.2 oz=204.1165665g density of aluminum=2.7g/cm3 (volume=mass/density) v=75.59872833cm3 volume=length x width x thickness 75.59872833= 49238.6112 x thickness thickness= 0.00154cm
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the area of the triangular face (0.5 x base x height) times the length of the prism * * * * * No. That will only give the volume which is not the same as the mass. You will either need to assume that the prism is of uniform density. In that case, you multiply its volume by the density. Alternatively, you follow Archimedes' principle to determine the density or even the weight of the prism. Then you need to convert to mass by dividing by the force of gravity. Not as easy as the first answer wrongly made it look.
Mass = Density x Volume
Pressure=mass/unit area