![]() These are different statements because hydrostatic pressure is being applied to the entire surface of the tank (and hence the entire surface is pushing back by Newton's $3$rd law), so the force at the bottom is not the only thing coming into play in the force balance. The point is that the net vertical force on the water must be zero, which is distinct from requiring that the force from the tank bottom be equal to gravity. This might seem surprising, however, because we intuitively expect the tank to only need to feel the force necessary to support the water's weight- so where's the disconnect? The specific gravity of wooden block is 0.7.As others have discussed, the computations are computing different things, but only the second approach yields the total force on the bottom of the tank. Find the volume of water displaced and the position of center of buoyancy. A wooden block of width 2m, depth 1.5m and length 4m floats horizontally in water. ![]() Solution: Buoyant force per m = Weight of water displaced per m = 12039N/m Buoyant force for 3m (F B3) = 12039x3 = 36117N Weight for 3 m of pipe (W 3) = 22369N Upward force on each anchorage = F B3 – W 3 = 36117-22369 = 13748N 3. Calculate the buoyancy force per meter run and upward force on each anchorage. It is laid across the bed of a river, completely immersed in water and is anchored at intervals of 3m along its length. A steel pipeline carrying gas has an internal diameter of 120cm and an external diameter of 125cm. Solution: a) Weight of pontoon = Weight of water displaced W = 9810圆x10x2 = 1177200 N = 1177.2 KN b) Draught in sea water (D) = ? Weight of pontoon = Weight of sea water displaced 1177200 = 1177200 = D = 1.95m c) D max = 2.3m Load that can be supported in fresh water (P) = ? Total upthrust (F B) = Weight of water displaced = 9810圆x10x2.3 = 1353780N = 1353.78KN P = F B – W = 1353.78-1177.2= 176.58 KN 2. Calculate (a) weight of pontoon, (b) its draught in seawater of density 1025 kg/m 3 and (c) the load that can be supported by the pontoon in fresh water if the maximum draught permissible is 2.3m. ![]() ![]() ![]() A rectangular pontoon has a width of 6m, length of 10m and a draught of 2m in fresh water. ![]()
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