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## Homework Statement

An empty rubber balloon has a mass of .0111 kg. The balloon is filled with helium at 0degrees C, 1atm pressure, and a density of .179 kg/m^3. The filled balloon has a radius of .154 m.

What is the magnitude of the buoyant force acting on the balloon? Answer in units of N.

and

What is the magnitude of the net force acting on the balloon? Answer in uts of N.

## Homework Equations

Buoyant Force= (density of fluid)(g)(A)(change in h)

## The Attempt at a Solution

don't know what Area to use, is it the area of the circle? and how do I integrate the mass of the empty balloon?

Thanks