I have two homework problems that I am unable to answer related to buoyancy/force. Please help! Thanks! 1. How much force (in Newtons) does it take to hold a 100kg man completely under water in the ocean? His density is 903 kg/m^3, and the specific gravity of sea water is 1.07. They give the following hint: Buoyant force is greater than the weight: B.F. = Weight + Force Down 2. What is the buoyant force in N on a 6.6 m^3 helium balloon in air at standard conditions? The density of air is 1.3 kg/m^3 They give the following hint: According to Archimedes you only need to know the weight of the air displaced.