A barge is 15 ft wide and 40 ft long and floats with a draft (i.e., depth below water) of 4ft. It is piled so high with gravel that its center of gravity is 3ft above the waterline. Is it stable?

Problem 4: Buoyancy I Pontoon bridges use buoyant forces to support loads. This problem will ask you to consider a 10 ft section of the pontoon bridge sketched below. The bridge deck is 4 ft wide, and each 10 ft section has five 55 gallon drums on each side. Each drum has a diameter of 22 in, so the cross-sectional area of each drum is 2.64 ft², and each drum is 2.79 ft tall. Assume the bridge deck and the bracing system for the drums weigh 2300 lb per 10 ft section but occupy negligible volume. The bridge floats in water with y = 62.3 lb/ft³. Part A What is the cross-sectional area of all ten drums? [ft²] Part B What is the volume of all ten drums? [ft³] Part C When the bridge is unloaded, what length of the drums will be underwater? [ft] PLAN VIEW ∞∞∞∞0 ooooo SECTION VIEW Part D How much weight can each 10 ft section carry without sinking? [lb]

Believe it or not, canoes have been made out of concrete (and they actually float). But even though concrete has a lower density than aluminum, a concrete canoe weighs a lot more than an aluminum one of the same size. Why is that? (The two canoes are the same size if the length and width are the same.)

According to ACI 318, if three compression tests of concrete were required per concrete truck, how much less volume of concrete per truck would need to be tested if 8" cylinders were used as opposed to 12" cylinder?