Solution:<\/strong><\/span>
\nTo draw a liquid up a straw, we expand our lungs This reduces the air pressure inside the mouth to less than atmospheric pressure The resulting difference in pressure produces a net upward force on the liquid in the stra4<\/p>\nChapter 15 Fluids Q.1P<\/strong>
\nEstimate the weight of the air in your physics classroom.
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.2CQ<\/strong>
\nConsidering your answer to the previous question, is it possible to sip liquid througha straw on the surface of the Moon? Explain
\nSolution:<\/strong><\/span>
\nNo. Ibecause the Moon has no atmosphere (of any significance) to press down on the surface of the liguidi<\/p>\nChapter 15 Fluids Q.2P<\/strong>
\nWhat weight of water is required to fill a 25-gallon aquarium?
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.3CQ<\/strong>
\nWater towers on the roofs of buildings have metal bands wrapped around them for support The spacing between bands is smaller near the base of a tower than near its top Explain
\nSolution:<\/strong><\/span>
\nThe pressure in the tank of water increases with depth I The pressure is greatest near the bottom To provide sufficient support there, the metal bands must be spaced more closely together<\/p>\nChapter 15 Fluids Q.3P<\/strong>
\nYou buy a “gold” ring at a pawn shop. The ring has a mass of 0.014 g and a volume of 0.0022 cm3. Is the ring solid gold,?
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.4CQ<\/strong>
\nWhat holds a suction cup in place?
\nSolution:<\/strong><\/span>
\nA suction cup is held in place by atmospheric pressura When the cup is applied, you push it flat against the surface you want to stick it to. This expels most of the air from the cup. and leads to a larger pressure on the outside of the cup IThus. atmospheric pressure pushes the outside of the cup against the surfacel<\/p>\nChapter 15 Fluids Q.4P<\/strong>
\nEstimate the weight of a treasure chest filled with gold doubloons.
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.5CQ<\/strong>
\n
\nSolution:<\/strong><\/span>
\nThis experiment shows that a certain pressure is needed at the bottom of the water column, and not just a certain weight of water To blow the top off the barrel it is necessary to increase the
\npressure in the barrel enough so that the increase in pressure multiplied by the surface area of the top exceeds 400 N. The required height of water provides the necessary increase in
\npressure. However the increase in pressure p. g h depends only on the height of the water in the tube, not on its weight.<\/p>\nChapter 15 Fluids Q.5P<\/strong>
\nA cube of metal has a mass of 0347 kg and measures 3.21 cm on a side. Calculate the density and identify the metal.
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.6CQ<\/strong>
\nWhy is it more practical to use mercury in the barometer shown in Figure 15-4 than water?
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.6P<\/strong>
\nWhat is the downward force exerted by the abnosphere on a football field, whose dimensions are 360 ft by 160 ft?
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.7CQ<\/strong>
\nAn object’s density can be determined by first weighing it in air, then in water (provided the density of the object is greater than the density of water, so that it is totally submerged when placed in water). Explain how these two measurements can give the desired result.
\nSolution:<\/strong><\/span>
\n
\n<\/p>\nChapter 15 Fluids Q.7P<\/strong>
\nBIO Bioluminescence Some species of dinoflagellate (a type of unicellular plankton) can produce light as the result of
\nbiochemical reactions within the cell. This light is an example of bioluminescence. It is foundthat bioluminescence in dinofla-gcllates can be triggered by deformation of the cell surface with a pressure as low as one dyne (10\u22125 N) per square centimeter. What is this pressure in (a) pascals and (b) atmospheres?
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.8CQ<\/strong>
\nHow does a balloonist control the vertical motion of a hot-air balloon?
\nSolution:<\/strong><\/span>
\nThe vertical motion of the balloon is controlled by adding and removing of heat to the air in the balloon. The adding and removing of heat causes change the temperature of the air in the balloon Further, the change in temperature will result in change in density of air in the balloon So, one can control the vertical motion of a hot air balloon by controlling the air density in balloon. By adjusting density of the air in balloon we can adjust the elevation and the depression in the vertical motion of the balloon<\/p>\nChapter 15 Fluids Q.8P<\/strong>
\nA 79-kg person sits on a 3.7-kg chair. Each leg of the chair makes contact with the floor in a circle that is 1.3 cm in diameter. Find the pressure exerted on the floor by each leg of the chair, assuming the weight is evenly distributed.
\nSolution:<\/strong><\/span>
\n
\n<\/p>\nChapter 15 Fluids Q.9CQ<\/strong>
\nWhy is \u00a1t possible forpeople to float without effort inUtah\u2019s Great Salt Lake?
\nSolution:<\/strong><\/span>
\nThe water of this lake has a higher salinity, and thus, a higher density than ocean water In fact. the density of its water is somewhat greater than the density of a typical human bod. This means that a person can float in the salt lake much like a block of wood floats in fresh water<\/p>\nChapter 15 Fluids Q.9P<\/strong>
\nTo prevent damage to floors (and to increase friction), a crutch will often have a rubber tip attached to its end. If the end of the crutch is a circle of radius 1.2 cm without the tip, and the tip is a circle of radius 2.5 cm, by what factor does the tip reduce the pressure exerted by the crutch?
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.10CQ<\/strong>
\nPhysics in the Moviesln the movie Voyage to the Bottom of the Sea, the Earth is experiencing a rapid warming In one scene, large icebergs break up into small, car-size chunks that drop
\ndownward through the water and bounce off the hull of the submarine Seaview. Is this an example of good. bad, or ugly physics? Explain.
\nSolution:<\/strong><\/span>
\nThe physics in this case is pretty ugly Ice floats in water whether it is a house-sized iceberg, a car-sized chunk or a thimble-sized ice cube. ll Earth is warming and icebergs are breaking up into smaller pieces. each of the smaller pieces will be just as buoyant as the original iceberg<\/p>\nChapter 15 Fluids Q.10P<\/strong>
\nAn inflated basketball has a gauge pressure of 9.9 lb\/inz. What is the actual pressure inside the ball?
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.11CQ<\/strong>
\nOne day. while snorkeling near the surface of a crystal-clear ocean, it occurs to you that you could go considerably deeper by simply lengthening the snorkel tube. Unfortunately, this does not work well at all Why?
\nSolution:<\/strong><\/span>
\nThe problem is that as you go deeper into the water the pressure pushing against your chest and lungs increases rapidly Even if you had a long tube on your snorkel, you would find it
\ndifficult to expand your lungs to take a breathS The air coming through the snorkel would be at atmosphere pressure. Ibut the water pushing against your chest might have twice that pressura Scuba gear not only holds air for you in a tank, but it also feeds this air to you under pressurel<\/p>\nChapter 15 Fluids Q.11P<\/strong>
\nSuppose that when you ride on your 7.70-kgbike the weight of you and the bike is supported equally by the two tires. If the gauge pressure in the tires is 70.5 1b\/in and the area of contact between each tire and the road is 7.13 cm2, what is your weight?
\nSolution:<\/strong><\/span>
\n
\n= 615N<\/p>\nChapter 15 Fluids Q.12CQ<\/strong>
\nSince metal is more dense than water, how is it possible for a metal boat to float?
\nSolution:<\/strong><\/span>
\nThe buoyant force exerted on the body is equal to the weight of water displaced by the body. The weight of the fluid also depends on the density of the tluid
\nTwo torces act upon an object when it enters into water torce due to gravity which act directly in the downward direction and an upward buoyance torce which is determined by the weight ot the
\nwater displaced by the objectS An object floats it torce due to gravity is less than the upward buoyance torce In other words, an object floats it its weight is less than the amount ot water it displaces. A metal boat floats because, even though it weighs a lot. it displaces a huge amount ot water that weighs even mora Also, a boat is designed in such a manner so that they it displace sufficient water to assure that it floats easily.<\/p>\nChapter 15 Fluids Q.12P<\/strong>
\nIP The weight of your 1420-kg car is supported equally by its four tires, each inflated to a gauge pressure of 35.0 lb\/in2. (a) What is the area of contact each tire makes with the road? (b) If the gauge pressure is increased, does the area of contact increase, decrease, or stay the same? (c) What gauge pressure is required to give an area of contact of 116 cm2 for each tire?
\nSolution:<\/strong><\/span>
\n
\n
\n
\n
\n<\/p>\nChapter 15 Fluids Q.13CQ<\/strong>
\nA sheet of water passing over a waterfall is thicker near the top than near the bottom Similarly. a stream of water emerging from a water faucet becomes narrower as it falls Explain
\nSolution:<\/strong><\/span>
\nAs the water falls, it speeds up Still, the amount of water that passes a point in a given time is the same at any height. If the thickness of the water stayed the same and its speed increased.
\nthe amount of water per time would increasa IThus, the thickness of the water must decrease to offset the increase in speed<\/p>\nChapter 15 Fluids Q.13P<\/strong>
\nCE Two drinking glasses. I and 2. are filled with water to the same depth Glass I has twice the diameter of glass 2. (a) Is the weight of the water in glass 1 greater than, less than, or equal to
\nthe weight of the water in glass 2? (b) Is the pressure at the bottom of glass 1 greater than, less than, or equal to the pressure at the bottom of glass 2?
\nSolution:<\/strong><\/span>
\n
\n
\n<\/p>\nChapter 15 Fluids Q.14CQ<\/strong>
\nIt is a common observation that smoke rises more rapidly through a chimney when there is a wind blowing outside Lxplain
\nSolution:<\/strong><\/span>
\nAs wind blows across the top of the chimney, a pressure difference is established between the top and the bottom of the chimney. with the top having the lower pressurel This will cause smoke to rise more rapidly<\/p>\nChapter 15 Fluids Q.14P<\/strong>
\n
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.15CQ<\/strong>
\nIs it best for an airplane to take off against the wind or with the wind? Explain
\nSolution:<\/strong><\/span>
\nIf we take off into the wind, the airspeed over the wings is greater than if we take off with the wind. This means that more lift is produced when taking off into the wind, which is the preferable situ ation<\/p>\nChapter 15 Fluids Q.15P<\/strong>
\nWater in the lake behind Hoover Dam is 221 m deep. What is the water pressure at the base of the dam?
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.16CQ<\/strong>
\nIf you have a hair dryer and a Ping Pong ball at home. try this demonstration Direct the air from the dryer in a direction just above horizontal Next, place the Ping Pong ball in the stream of air
\nIf done just right, the ball will remain suspended in midair Use the Bernoulli effect to explain this behavior
\nSolution:<\/strong><\/span>
\nIf a ball is placed in a stream of air such that the speed of air over its upper surface is greater than the speed across its lower surface, the result will be a lower pressure at the top of the ball This results in an upward force that can equal the weight of the ball<\/p>\nChapter 15 Fluids Q.16P<\/strong>
\nCE Two drinking glasses, 1 and 2, are filled with water to the same depth. Glass 1 has twice the diameter of glass 2. (a) Is the weight of the water in glass 1 greater than, less than, or equal to the weight of the water in glass 2? (b) Is the pressure at the bottom of glass 1 greater than, less than, or equal to the pressure at the bottom of glass 2?
\nSolution:<\/strong><\/span>
\n
\n<\/p>\nChapter 15 Fluids Q.17CQ<\/strong>
\nSuppose a pitcher wants to throw a baseball so that it rises as it approaches the batter. How should the ball be spinning to accomplish this feat? Explain.
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.17P<\/strong>
\nAs a storm front moves in, you notice that the column of mercury in a barometer rises to only 736 mm. (a) What is the air pressure? (b) If the mercury in this barometer is replaced with water, to what height does the column of water rise? Assume the same air pressure found in part (a).
\nSolution:<\/strong><\/span>
\n
\n<\/p>\nChapter 15 Fluids Q.18P<\/strong>
\n
\nSolution:<\/strong><\/span>
\n
\n<\/p>\nChapter 15 Fluids Q.19P<\/strong>
\n
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.20P<\/strong>
\nA cylindrical container witha cross-sectional area of 65.2 cm2 holds a fluid of density 806 kg\/m3. At the bottom of the container the pressure is 116 kPa. (a) What is the depth of the fluid? (b) Find the pressure at the bottom of the container after an additional 2.05 \u00d7 10\u22123 m3 of this fluid is added to the container. Assume that no fluid spills o ut of the container.
\nSolution:<\/strong><\/span>
\n
\n<\/p>\nChapter 15 Fluids Q.21P<\/strong>
\nIP Tourist Submarine A submarine called the Deep View 66 is currently being developed to take 66 tourists at a time on sightseeing trips to tropical coral reefs. According to guidelines of the AmericanSociety of Mechanical Engineers (ASME), to be safe for human occupancy the Deep View 66 must be able to withstand a pressure of 10.0 N per square millimeter, (a) To what depth can the Deep View 66 safely descend in seawater? (b) If the submarine is used in freshwater instead, is its maximum safe depth greater than, less than, or the same as in seawater? Explain
\nSolution:<\/strong><\/span>
\n
\n<\/p>\nChapter 15 Fluids Q.22P<\/strong>
\n
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.23P<\/strong>
\nIP You step into an elevator holding a glass of wa ter filled to a depth of 6.9 cm. After a moment, the elevator moves upward with constant acceleration, increasingits speed from 0 to 2.4 m\/s in 3.2 s. (a) During the period of acceleration, is the pressure exerted on the bottom of the glass greater than, less than, or the same as before the elevator began to move? Explain, (b) Find the change in the pressure exerted on the bottom of the glass as the elevator accelerates.
\nSolution:<\/strong><\/span>
\n
\n<\/p>\nChapter 15 Fluids Q.24P<\/strong>
\nSuppose you pour water into a container until it reaches a depth of 12 cm. Next, you carefully pour ina 7,2-cm thickness of olive oil so that it floats on top of the water. What is the pressure at the bottom of the container?
\nSolution:<\/strong><\/span>
\n
\n<\/p>\nChapter 15 Fluids Q.25P<\/strong>
\nReferring to Example 15%, suppose that some vegetable oil has been added to both sides of the U tube. On the right side of the tube, the depth of oil is 5.00 cm, as before. On the left side of the tube, the depth of the oil is 3.00 cm. Find the difference in fluid level between the two sides of the tube.
\nSolution:<\/strong><\/span>
\n
\n<\/p>\nChapter 15 Fluids Q.26P<\/strong>
\nP As a stunt, you want to sip some water through a very long, vertical straw, (a) First, explain why the liquid moves upward, against gravity, into your mouth when you sip. (b) What is the tallest straw that you could, in principle, drink from in this way?
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.27P<\/strong>
\n
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.28P<\/strong>
\nAcylindrical container 1.0 m tall contains mercury to a certain depth, d. The rest of the cylinder is filled with water, If the pressure at the bottom of the cylinder is two atmospheres, what is the depth d?
\nSolution:<\/strong><\/span>
\n
\n<\/p>\nChapter 15 Fluids Q.29P<\/strong>
\nCE Predict\/Explain Beebe and BartonOn Wednesday, August 15,1934, William Beebe and Otis Barton made history by descending in the Bathysphere\u2014basically a steel sphere 4.75 ft in diameter\u20143028 ft below the surface of the ocean, deeper than anyone had been before, (a) As the Bathysphere was lowered, was the buoyant force exerted on it at a depth of 10 ft greater than, less than, or equal to the buoyant force exerted on it at a depth of 50 ft? (b) Choose the best explanation from among the following:
\nI. The buoyant force depends on the density of the water, which is essentially the same at 10 ft and 50 ft.
\nII. The pressure increases with depth, and this increases the buoyant force.
\nIII. The buoyant force decreases as an object sinks below the surface of the water.
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.30P<\/strong>
\nCE Lead is more dense than aluminum, (a) Is the buoyant force on a solid lead sphere greater than, less than, or equal to the buoyant force on a solid aluminum sphere of the same diameter? (b) Does your answer to part (a) depend on the fluid that is causing the buoyant force?
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.31P<\/strong>
\nCE A fish canying a pebble in its mouth swims with a small, constant velocity in a small bowl. When the fish drops the pebble to the bottom of the bowl, does the water level rise, fall, or stay the same?
\nSolution:<\/strong><\/span>
\nThe fluid exerts an upward force when an object is placed in that fluid. This force comes from the pressure imposed by the fluid on that particular object.
\nAs the pressure increases, the depth also increases. It depends on the buoyant t say whether the object floats or sinks.
\nFish displaces some volume of water, which to become neutrally buoyant. When a fish holds a pebble, water is displaced which is equal to its weight and the weight of the pebble.
\nFish adjusts its swim bladder to attain neutral buoyancy, when it drops a pebble into the water. During this activity, the fish displaces water equal to its weight only and the pebble displaces water equal only to its own volume. When the fish drops the pebble, smaller volume of water was displaced concluding that the level of water will fall.
\nTherefore, the water level will fall.<\/p>\nChapter 15 Fluids Q.32P<\/strong>
\nA raft is 4.2 m wide and 6.5 m long. When a horse is loaded fonto the raft, it sinks 2,7 cm deeper into the water. What is the weight of the horse?
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.33P<\/strong>
\nTo walk on water, all you need is a pair of water-walking boots shaped like boats. If each boot is 27 cm high and 34 cm wide, how long must they be to support a 75-kg person?
\nSolution:<\/strong><\/span>
\n
\n<\/p>\nChapter 15 Fluids Q.34P<\/strong>
\nA3.2-kg balloon is filled with helium (density = 0.179 kg\/m3). If the balloon is a sphere with a radius of 4.9 m, what is the maximum weight it can lift?
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.35P<\/strong>
\nA hot-air balloon plus cargo has a mass of 1890 kg and a volume of 11,430 m3. The balloon is floating at a constant height of 6.25 m above the ground, What is the density of the hot air in the balloon?
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.36P<\/strong>
\nIn the lab you place a beaker that is half full of water (density pw)on a scale. You now use a high t string to suspend a piece of metal of volume v in the water, The metal is completely submerged, and none of the water spills out of the beaker. Give a symbolic expression for the change in reading of the scale.
\nSolution:<\/strong><\/span>
\n
\n<\/p>\nChapter 15 Fluids Q.37P<\/strong>
\n\u00b7 CE Predict\/Explain A block of wood has a steel ball glued one surface. The block can be Floated with the ball “high dry” on its top surface, (a) When the block is inverted, and th ball is immersed in water, does the volume of wood that is submerged increase, decrease, or stay the same? (b) Choose the best explanation from among the following:
\nI. When the block is inverted the ball pulls it downward causing more of the block to be submerged.
\nII. The same amount of mass is supported in either case, there fore the amount of the block that is submerged is the same
\nIII. When the block is inverted the ball experiences a buoyant force, which reduces the buoyant force that must be provided by the wood.
\nSolution:<\/strong><\/span>
\nReasoning:
\nArchimedes principle states that, an object completely immersed in a fluid experience an upward buoyant force equal in magnitude to the weight of fluid displaced by the object. An object floats when it displaces an amount of fluid equal to its weight.
\nSolution:
\n(a) If block is inverted, and ball is immersed in the water, the buoyant force experienced
\nby the steel ball is greater than the buoyant force experienced by the wood block as displaced volume of the water is greater for steel ball than wood block. This result, volume of the wood block that submersed in the water will. Because, buoyant force directly proportional to weight of the displaced volume of the water
\n(b) When the block is inverted the ball experiences a buoyant force, which reduces the buoyant force that must be provided by the block of wood.
\nBest explanation is: statement<\/p>\nChapter 15 Fluids Q.38P<\/strong>
\n\u00b7 CE Predict\/Explain In the preceding problem, suppose the block of wood with the ball “high and dry” is floating in a tank of water, (a) When the block is inverted, does the water level in the tank increase, decrease, or stay the same? (b) Choose the best explanation from among the following:
\nI. Inverting the block makes the block float higher in the water, which lowers the water level in the tank.
\nII. The same mass is supported by the water in either case, and therefore the amount of displaced water is the same.
\nIII. The inverted block floats lower in the water, which displaces more water and raises the level in the tank.
\nSolution:<\/strong><\/span>
\n
\n(a)
\nThe weight of the block will be same, whether it is erect or inverted. So the same mass will be supported by the water and thus the volume of water that must be displaced to float the block will be same when it is inverted. As a result, the water level in the tank remains the same.
\n(b)
\nThe weight of the block will be same, whether it is erect or inverted. So the same mass will be supported by the water and thus the volume of water that must be displaced to float the block will be same when it is inverted. As a result the water level in the tank remains the same. Hence, the best explanation is (II).<\/p>\nChapter 15 Fluids Q.39P<\/strong>
\n
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.40P<\/strong>
\nCE Predict\/Explain Referring to Active Example 15-1, suppose the flask with the wood tied to the bottom is placed on a scale. At some point the string breaks and the wood rises to the surface where it floats, (a) When the wood is floating, is the reading on the scale greater than, less than, or equal to its previous reading? (b) Choose the best explanation from among the following:
\nI. The same mass is supported by the scale before and after the string breaks, and therefore the reading on the scale remains the same.
\nII. When the block is floating the water level drops, and this reduces the reading on the scale.
\nIII. When the block is floating it no longer pulls upward on the flask; therefore, the reading on the scale increases.
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.41P<\/strong>
\nCE On a planet in a different solar system the acceleration of gravity is greater than it is on Earth. Tf you float in a pool of water on this planet, do you float higher than, lower than, or at the same level as when you float in water on Earth?
\nSolution:<\/strong><\/span>
\nAs far as floating goes, the planet and Earth are the. This is because gravity has no effect on the equilibrium of a floating body, as the weight and up-thrust will both change by the same factor.<\/p>\nChapter 15 Fluids Q.42P<\/strong>
\nAn air mattress is 2.3 m long, 0,66 m wide, and 14 cm deep. If the air mattress itself has a mass of 0.22 kg, what is the maximum mass it can support in freshwater?
\nSolution:<\/strong><\/span>
\n
\n<\/p>\nChapter 15 Fluids Q.43P<\/strong>
\nA solid block is attached to a spring scale. When the block is suspended in air, the scale reads 20.0 N; when it is completely immeresed in water, the scale reads 17.7 N. What are (a) the volume and (b) the density of the block?
\nSolution:<\/strong><\/span>
\n<\/p>\nChapter 15 Fluids Q.44P<\/strong>
\nAs in the previous problem, a solid block is suspended from a spring scale. If the reading on the scale when the block is completely immersed in water is 25.0 N, and the reading when it is completly immersed in alcohol of density 806 kg\/m3 is 25.7 N, what are (a) the block’s volume and (b) its density?
\nSolution:<\/strong><\/span>
\n
\n<\/p>\nChapter 15 Fluids Q.45P<\/strong>
\nBIO Aperson weighs 756 N in air and has abody-fat percentage of 28.1%. (a) What is the overall density of this person’s body? (b) What is the volume of this person’s body? (c) Find the apparent weight of this person when completely submerged in water.
\nSolution:<\/strong><\/span>
\n
\n
\n
\n<\/p>\nChapter 15 Fluids Q.46P<\/strong>
\nIP A log floats in a river with one-fourth of its volume above the water, (a) What is the density of the log? (b) If the river carries the log into the ocean, does the portion of the log above the water increase, decrease, or stay the same? Explain.
\n