. The elements of railroad engineering . he pressure onthe bottom ? What is the upward pressure per square inch, 2 feet6 inches from the bottom ? Solution.—1 X 36 X = sq. in. = area of the strip. Depthof center of gravity = 20 — 1 = 19 ft. , X 19 X 12 X .03617 = lb. = total pressure upon thestrip. Ans. 932 71The pressure per square inch is ^ = lb., nearly. 86 X 36 X 20 X 12 ==8,836 lb. = the pressure on thebottom. Ans. = 1 X X 12 = lb. = the upwardpressure per square inch, 2 ft. 6 in. from the bottom, since 2 ft. 6
. The elements of railroad engineering . he pressure onthe bottom ? What is the upward pressure per square inch, 2 feet6 inches from the bottom ? Solution.—1 X 36 X = sq. in. = area of the strip. Depthof center of gravity = 20 — 1 = 19 ft. , X 19 X 12 X .03617 = lb. = total pressure upon thestrip. Ans. 932 71The pressure per square inch is ^ = lb., nearly. 86 X 36 X 20 X 12 ==8,836 lb. = the pressure on thebottom. Ans. = 1 X X 12 = lb. = the upwardpressure per square inch, 2 ft. 6 in. from the bottom, since 2 ft. 6 in. = ft. Ans. 979. The effectsof the lateral pressureare illustrated in ^ is a tall vesselhaving a stop-cocknear its base, and ar-ranged to float uponthe water, as this vessel isfilled with water, thelateral pressuresany two points of thesurface of the vessel, and opposite to each Pig. les. other, are equal. Being equal, and acting in opposite direc-tions, they destroy each other (see Art. 881), and no motion. 308 HYDROMECHANICS. can result ; but, if the stop-cock be opened, there will beno resistance to that pressure actinj^ on the surface e(iual tothe area of the opening, the pressure which formerly actedcausing the water to flow out, while its equal and oppositepressure will cause the vessel to move backward through thewater in a direction opposite to that of the spouting water. Since the pressure on the bottom of a vessel due to theweight of the liquid is dependent only upon the height ofthe liquid, and not upon the shape of the vessel, it followsthat if a vessel has a number of radiating tubes, as Fig. 104,the water in each tube will be on the same level no matterwhat may be the shape of the tubes. For, if the water werehigher in one tube than in the others, the downward pressureon the bottom due to the height of the water in this tube would be greaterthan that due to theheight of the waterin the other , theupward pressurewould
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