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**1. Homework Statement**

An emtpy rubber balloon has a mass of 0.0120 kg. The balloon is filled with helium at 0 degrees Celcius, 1 atm pressure, and a density of 0.179 kg / m3. The filled balloon has a radius of 0.500 m.

**A.**What is the magnitude of the buoyant force acting on the balloon?

**B.**What is the magnitude of the net force acting on the balloon?

**2. Homework Equations**

Density of air = 1.29 kg/m3

Density of helium = 0.179 kg/m3

Net force = 0 = ((density of fluid x volume of fluid) - (density of object x volume of object))(9.81 m / s2)

Net force = Buoyant force - Weight of object

**3. The Attempt at a Solution**

I don't know what equation to use to find either force or what to do to get started.