. Practical physics. water=) 2. Kerosene is as heavy as water (1 cu. ft. of water= lb.).Find the pressure of the kerosene per square foot and per square inchon the bottom of an oil tank filled to a depth of 30 ft. 3. What pressure per square inch is required to force water to thetop of the Woolworth building in New York City, 780 ft. high ? 4. A swimming tank .50 ft. square is filled with water to a depth of5 ft. Find the force of the water on the bottom; on one side. 5. If the areas of the surfaces ^B inFig. 8, (i) and (2), are the same, and ifwater is poured into each vessel at
. Practical physics. water=) 2. Kerosene is as heavy as water (1 cu. ft. of water= lb.).Find the pressure of the kerosene per square foot and per square inchon the bottom of an oil tank filled to a depth of 30 ft. 3. What pressure per square inch is required to force water to thetop of the Woolworth building in New York City, 780 ft. high ? 4. A swimming tank .50 ft. square is filled with water to a depth of5 ft. Find the force of the water on the bottom; on one side. 5. If the areas of the surfaces ^B inFig. 8, (i) and (2), are the same, and ifwater is poured into each vessel at D tillit stands at the same height above AB,how will the downward force on A B inFig. 8, (^), compare with that in Fig. 8,(i)? Test your answer, if j^ossible, bymaking AB & piece of cardboard andpouring water in at D, in each case,until the cardboard is forced off. 6. If the vessel shown in Fig. 10, (1) (p. 15), has a base of 200 sq. if the water stands 100 cm. deep, what is the total force on thebottom ?. Fig. 8. Illustrating hydro-static paradox PASCALS LAW 15 7. If the weight of the empty vessel in Fig. 10, (i), is small comparedwith the weight of the contained water, will the force required to liftthe vessel and water be greater or less than the forceexerted by the water against the bottom? Explain. 8. A whale when struck with a harpoon will oftendive straight down as much as 400 fathoms (2400 ft.).If the body has an area of 1000 sq. ft., what is the totalforce to which it is subjected? 9. A hole 5 cm. square is made in a ships bottom7 m. below the water line. What force in kilograms isrequired to hold a board above the hole ? 10. Thirty years ago standpij^es were generallystraight cylinders. To-day they are more commonlyof the form shown in Fig. 9. What are the advantagesof each form ? Pascals Law
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysics, bookyear1922
