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Homework Statement
What diameter must a helium filled balloon have to float with neutral buoyancy? The mass of the empty balloon is 2 g.
Homework Equations
FB = (density)(gravity)(Volume)
Volume of balloon = 4/3(4.13)r^2
Density = mass/Volume
The Attempt at a Solution
I know that the balloon will float when its weight is equal to the weight of the air displaced.
Weight of balloon = Weight of air displaced
Weight of empty balloon = 0.002kg x 9.81 = 0.01962N
Thus weight of air displaced = 0.01962N
But this is a far as I am getting as I am very confused with where the density plays a roles since no densities is given in this problem.