An empty rubber balloon has a mass of 0.0120 kg. The balloon is filled with helium at 0 degrees celsuis, 1 atm pressure, and a density of 0.179kg/m^3. The filled balloon has a radius of .5m
a)What is the magnitude of the net force acting on the balloon?
b) What is the magnitude of the buoyant force acting on the balloon?
Please explain!!