A conical cup of height b, semi-vertical angle α rests open end down on a flat surface as shown. The cup is filled to height H with liquid of density ρ and a small hole is punched at the apex of the cone. The upward lifting force on the cup is F=πρg[bH2−nH3]tan2α , then 'n' is
Your answer seems reasonable.
Find out if you're right!