a hot air balloon is a sphere of volume 2210 m^3. the air outside has a density of 1.29 kg/m^3. what is the buoyant force acting on the balloon?

Answer 1

Buoyant force = weight of fluid displaced (air is a fluid)

Mass of fluid displaced = 2210 x 1.29 kg (volume x density)

So weight of fluid displaced = mg = 2210 x 1.29 x 9.81 N