34. The weight of a rectangular block of low-density mate-rial is 15.0 N. With a thin string, the center of the hori-zontal bottom face of the block is tied to the bottom ofa beaker partly filled with water. When 25.0% of theblock's volume is submerged, the tension in the string is10.0 N. (a) Find the buoyant force on the block. (b) Oilof density 800 kg/m3 is now steadily added to the bea-ker, forming a layer above the water and surround-ing the block. The oil exerts forces on each of thefour sidewalls of the block that the oil touches. Whatare the directions of these forces? (c) What happensto the string tension as the oil is added? Explain howthe oil has this effect on the string tension. (d) Thestring breaks when its tension reaches 60.0 N. At thismoment, 25.0% of the block's volume is still below thewater line. What additional fraction of the block's vol-ume is below the top surface of the oil?
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34. The weight of a rectangular block of low-density mate- rial is 15.0 N. With a thin string, the center of the hori- zontal bottom face of the block is tied to the bottom of a beaker partly filled with water. When 25.0% of the block's volume is submerged, the tension in the string is 10.0 N. (a) Find the buoyant force on the block. (b) Oil of density 800 kg/m3 is now steadily added to the bea- ker, forming a layer above the water and surround- ing the block. The oil exerts forces on each of the four sidewalls of the block that the oil touches. What are the directions of these forces? (c) What happens to the string tension as the oil is added? Explain how the oil has this effect on the string tension. (d) The string breaks when its tension reaches 60.0 N. At this moment, 25.0% of the block's volume is still below the water line. What additional fraction of the block's vol- ume is below the top surface of the oil?
(a)
Using Newton’s law, the buoyant force is,
(b)
The oil will push horizontally inward on the walls of the block.
(c)
When oil is added, pressure at the bottom increases resulting in an increase...
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