# Physics

A thin sheet of gold foil has an area of 2.98 cm2 and a mass of 6.20 mg. How thick is the sheet? The density of gold is 19, 300 kg/m3.

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1. mass=density*volume=density*area*t

thickness=mass/density*area

= 6.20E-6kg/(19.300kg/m^3*(2.98cm^2)(m/100cm)^2

= 6.20E-6/(19.300*2.98E-4) m
=1.08mm

check my work, that seems pretty thick .

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bobpursley

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