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We release an oil drop of radius r in air. The density of the oil is 640 kg/m3. C1 and C2 for 1 atmosphere air at 20∘ C are
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(m*g*sin(theta)*L-mu_1*m*g*cos(theta)*L)/(mu_2*m*g)
r^3=(3*C_1^2)/4*pi*d*C_2*g do the cubic root d=density
