You have learned that the pressure from a fluid at a certain depth is given by the equation P = pgh + Patm. You have also learned that the buoyant force is due to the difference in pressure between the top and bottom of an object. Derive the equation for the buoyant force from these two ideas. (Hint: In your derivation, use a simple submerged object, such as a perfect cube with sides of length s.) (3 points)