[SOLVED] Bouyant force 1. A ferry boat is 4.0 m wide and 6.0 m long. When a truck pulls onto it, the boat sinks 4.00 cm (0.04 m) in the water. What is the weight of the truck? 2. F(sub: B) = F(sub: g)[displaced fluid] = m(sub: f)g (magnitude of bouyant force = weight of the fluid displaced) F(sub: B) = F(sub: g)[object] = m(sub: o)g bouyant force = weight of floating object m = ρV (mass = density × volume) 3. Well, the voulme of the boat is (4.0 m)(6.0 m)(0.04 m) = (0.96 m³); I mean, the volume of the displaced water is that. ;) Density of fresh water = 1.00 × 10³ kg/m³ F = ρV(g) F = (1.00 × 10³ kg/m³)(0.96 m³)(9.81 m/s²) F = 9.4 × 10³ N Am I correct?