Question 1090131
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A spherical drop of oil with diameter 3 mm falls on water surface and produces a circular oil film of radius 10 cm. 
Calculate the thickness of oil film.
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The drop of oil has a volume of  {{{V[d]=(4/3)pi(1.5^3)}}} cubic millimeters.


The radius of the oil film needs to be convert to mm for consistency. 10 cm = 100 mm


The cylindrical film has a volume of  {{{V[cf]=pi*(100)^2*h}}} cubic millimeters.


Set the two equal to each other,

{{{V[d]=V[cf]}}}

{{{(4/3)pi(1.5^3)=pi*(100)^2*h}}}

{{{h=(4/3)((1.5^3)/(100^2))}}} millimeters.


Work that out for the height in mm.
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