Question

1,000 identical drops of oil of density 5000kg/m have
a total mass of 5 x 10kg. one of the drops forms a thin
film of area 0.5m2
on water. The thickness of the film
is?
volume = area * thickness
5*10kg * 1m^3/5000kg = 0.01 m^3
0.01m^3 = 1000*0.5 m^2 * thickness
2*10^-5m = thickness

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