# Helium-filled balloon tied to mass

1. A 1.10 balloon is filled with helium gas until it becomes a 24.0 -diameter sphere. What maximum mass can be tied to the balloon (with a massless string) without the balloon sinking to the floor? (in grams)

2. F = ma
pA = p*pi*r^2

F_air = p*pi*r^2 = 4583N, assuming 1atm pressure i.e. 101,300Pa

F_air = mg

m= F_air / g = 467000 grams