Problem Q12.1DQ: A cube of oak wood with very smooth faces normally floats in water. Suppose you submerge it... Problem Q12.2DQ: A rubber hose is attached to a funnel, and the free end is bent around to point upward. When water... Problem Q12.3DQ: Comparing Example 12.1 (Section 12.1) and Example 12.2 (Section 12.2), it seems that 700 N of air is... Problem Q12.4DQ Problem Q12.5DQ: You have probably noticed that the lower the tire pressure, the larger the contact area between the... Problem Q12.6DQ: In hot-air ballooning, a large balloon is filled with air heated by a gas burner at the bottom. Why... Problem Q12.7DQ: In describing the size of a large ship, one uses such expressions as it displaces 20,000 tons. What... Problem Q12.8DQ: You drop a solid sphere of aluminum in a bucket of water that sits on the ground. The buoyant force... Problem Q12.9DQ: A rigid, lighter-than-air dirigible filled with helium cannot continue to rise indefinitely. Why?... Problem Q12.10DQ: Which has a greater buoyant force on it: a 25-cm3 piece of wood floating with part of its volume... Problem Q12.11DQ: The purity of gold can be tested by weighing it in air and in water. How? Do you think you could get... Problem Q12.12DQ: During the Great Mississippi Flood of 1993, the levees in St. Louis tended to rupture first at the... Problem Q12.13DQ: A cargo ship travels from the Atlantic Ocean (salt water) to Lake Ontario (freshwater) via the St.... Problem Q12.14DQ: You push a piece of wood under the surface of a swimming pool. After it is completely submerged, you... Problem Q12.15DQ: An old question is Which weighs more, a pound of feathers or a pound of lead? If the weight in... Problem Q12.16DQ: Suppose the door of a room makes an airtight but frictionless fit in its frame. Do you think you... Problem Q12.17DQ: At a certain depth in an incompressible liquid, the absolute pressure is p. At twice this depth,... Problem Q12.18DQ: A piece of iron is glued to the top of a block of wood. When the block is placed in a bucket of... Problem Q12.19DQ: You take an empty glass jar and push it into a tank of water with the open mouth of the jar... Problem Q12.20DQ: You are floating in a canoe in the middle of a swimming pool. Your friend is at the edge of the... Problem Q12.21DQ: You are floating in a canoe in the middle of a swimming pool. A large bird flies up and lights on... Problem Q12.22DQ: Two identical buckets are filled to the brim with water, but one of them has a piece of wood... Problem Q12.23DQ: An ice cube floats in a glass of water. When the ice melts, will the water level in the glass rise,... Problem Q12.24DQ: A helium-filled balloon is tied to a light string inside a car at rest. The other end of the string... Problem Q12.25DQ: If the velocity at each point in space in steady-state fluid flow is constant, how can a fluid... Problem Q12.26DQ: In a store-window vacuum cleaner display, a table-tennis ball is suspended in midair in a jet of air... Problem Q12.27DQ: A tornado consists of a rapidly whirling air vortex. Why is the pressure always much lower in the... Problem Q12.28DQ: Airports at high elevations have longer runways for takeoffs and landings than do airports at sea... Problem Q12.29DQ: When a smooth-flowing stream of water comes out of a faucet, it narrows as it falls. Explain. Problem Q12.30DQ Problem 12.1E Problem 12.2E: A cube 5.0 cm on each side is made of a metal alloy. After you drill a cylindrical hole 2.0 cm in... Problem 12.3E Problem 12.4E: Gold Brick. You win the lottery and decide to impress your friends by exhibiting a million-dollar... Problem 12.5E: A uniform lead sphere and a uniform aluminum sphere have the same mass. What is the ratio of the... Problem 12.6E Problem 12.7E: A hollow cylindrical copper pipe is 1.50 m long and has an outside diameter of 3.50 cm and an inside... Problem 12.8E Problem 12.9E Problem 12.10E: BIO (a) Calculate the difference in blood pressure between the feet and top of the head for a person... Problem 12.11E: BIO In intravenous feeding, a needle is inserted in a vein in the patients arm and a tube leads from... Problem 12.12E: A barrel contains a 0.120-m layer of oil floating on water that is 0.250 m deep. The density of the... Problem 12.13E: BIO Standing on Your Head. (a) What is the difference between the pressure of the blood in your... Problem 12.14E: You are designing a diving bell to withstand the pressure of seawater at a depth of 250 m. (a) What... Problem 12.15E: BIO Ear Damage from Diving. If the force on the tympanic membrane (eardrum) increases by about 1.5 N... Problem 12.16E: The liquid in the open-tube manometer in Fig. 12.8a is mercury, y1 = 3.00 cm, and y2 = 7.00 cm.... Problem 12.17E: BIO There is a maximum depth at which a diver can breathe through a snorkel tube (Fig. E12.17)... Problem 12.18E: BIO The lower end of a long plastic straw is immersed below the surface of the water in a plastic... Problem 12.19E: An electrical short cuts off all power to a submersible diving vehicle when it is 30 m below the... Problem 12.20E: A tall cylinder with a cross-sectional area 12.0 cm2 is partially filled with mercury; the surface... Problem 12.21E: A cylindrical disk of wood weighing 45.0 N and having a diameter of 30.0 cm floats on a cylinder of... Problem 12.22E: A closed container is partially filled with water. Initially, the air above the water is at... Problem 12.23E: Hydraulic Lift I. For the hydraulic lift shown in Fig. 12.7, what must be the ratio of the diameter... Problem 12.24E: Hydraulic Lift II. The piston of a hydraulic automobile lift is 0.30 m in diameter. What gauge... Problem 12.25E: Exploring Venus. The surface pressure on Venus is 92 atm, and the acceleration due to gravity there... Problem 12.26E: A rock has mass 1.80 kg. When the rock is suspended from the lower end of a siring and totally... Problem 12.27E: A 950-kg cylindrical can buoy floats vertically in sea-water. The diameter of the buoy is 0.900 m.... Problem 12.28E: A slab of ice floats on a freshwater lake. What minimum volume must the slab have for a 65.0-kg... Problem 12.29E: An ore sample weighs 17.50 N in air. When the sample is suspended by a light cord and totally... Problem 12.30E: You are preparing some apparatus for a visit to a newly discovered planet Caasi having oceans of... Problem 12.31E: A rock with density 1200 kg/m3 is suspended from the lower end of a light string. When the rock is... Problem 12.32E: A hollow plastic sphere is held below the surface of a freshwater lake by a cord anchored to the... Problem 12.33E: A cubical block of wood, 10.0 cm on a side, floats at the interface between oil and water with its... Problem 12.34E: A solid aluminum ingot weighs 89 N in air. (a) What is its volume? (b) The ingot is suspended from a... Problem 12.35E: A rock is suspended by a light string. When the rock is in air, the tension in the string is 39.2 N.... Problem 12.36E: Water runs into a fountain, filling all the pipes, at a steady rate of 0.750 m3/s. (a) How fast will... Problem 12.37E: A shower head has 20 circular openings, each with radius 1.0 mm. The shower head is connected to a... Problem 12.38E: Water is flowing in a pipe with a varying cross-sectional area, and at all points the water... Problem 12.39E: Water is flowing in a pipe with a circular cross section but with varying cross-sectional area, and... Problem 12.40E: Home Repair. You need to extend a 2.50-inch-diameter pipe, but you have only a 1.00-inch-diameter... Problem 12.41E: A sealed tank containing seawater to a height of 11.0 m also contains air above the water at a gauge... Problem 12.42E Problem 12.43E: What gauge pressure is required in the city water mains for a stream from a fire hose connected to... Problem 12.44E: A small circular hole 6.00 mm in diameter is cut in the side of a large water tank, 14.0 m below the... Problem 12.45E: At a certain point in a horizontal pipeline, the waters speed is 2.50 m/s and the gauge pressure is... Problem 12.46E: At one point in a pipeline the waters speed is 3.00 m/s and the gauge pressure is 5.00 104 Pa. Find... Problem 12.47E: A golf course sprinkler system discharges water from a horizontal pipe at the rate of 7200 cm3/s. At... Problem 12.48E: A soft drink (mostly water) flows in a pipe at a beverage plant with a mass flow rate that would... Problem 12.49E Problem 12.50E: A pressure difference of 6.00 104 Pa is required to maintain a volume flow rate of 0.800m3/s for a... Problem 12.51P: In a lecture demonstration, a professor pulls apart two hemispherical steel shells (diameter D) with... Problem 12.52P: CP The deepest point known in any of the earths oceans is in the Marianas Trench, 10.92 km deep. (a)... Problem 12.53P: CALC A swimming pool is 5.0 m long, 4.0 m wide, and 3.0 m deep. Compute the force exerted by the... Problem 12.54P: BIO Fish Navigation. (a) As you can tell by watching them in an aquarium, fish are able to remain at... Problem 12.55P: CP CALC The upper edge of a gate in a dam runs along the water surface. The gate is 2.00 m high and... Problem 12.56P: Ballooning on Mars. It has been proposed that we could explore Mars using inflated balloons to hover... Problem 12.57P: A 0.180-kg cube of ice (frozen water) is floating in glycerine. The gylcerine is in a tall cylinder... Problem 12.58P: A narrow. U-shaped glass tube with open ends is filled with 25.0 cm of oil (of specific gravity... Problem 12.59P: A U-shaped tube open to the air at both ends contains some mercury. A quantity of water is carefully... Problem 12.60P: CALC The Great Molasses Flood. On the afternoon of January 15, 1919, an unusually warm day in... Problem 12.61P: A large, 40.0-kg cubical block of wood with uniform density is floating in a freshwater lake with... Problem 12.62P: A hot-air balloon has a volume of 2200 m3. The balloon fabric (the envelope) weighs 900 N. The... Problem 12.63P Problem 12.64P: A single ice cube with mass 16.4 g floats in a glass completely full of 420 cm3 of water. Ignore the... Problem 12.65P: Advertisements for a certain small car claim that it floats in water, (a) If the cars mass is 900 kg... Problem 12.66P: A piece of wood is 0.600 m long, 0.250 in wide, and 0.080 m thick. Its density is 700 kg/m3. What... Problem 12.67P: The densities of air, helium, and hydrogen (at = 1.0 atm and T = 20C) are 1.20kg/m3, 0.166 kg/m3,... Problem 12.68P: When an open-faced boat has a mass of 5750 kg, including its cargo and passengers, it floats with... Problem 12.69P Problem 12.70P: In seawater, a life preserver with a volume of 0.0400 m3 will support a 75.0-kg person (average... Problem 12.71P: CALC A closed and elevated vertical cylindrical tank with diameter 2.00 m contains water to a depth... Problem 12.72P Problem 12.73P: A plastic ball has radius 12.0 cm and floats in water with 24.0% of its volume submerged, (a) What... Problem 12.74P: Assume that crude oil from a supertanker has density 750 kg/m3. The tanker runs aground on a... Problem 12.75P Problem 12.76P: A barge is in a rectangular lock on a freshwater river. The lock is 60.0 m long and 20.0 m wide, and... Problem 12.77P: CP Water stands at a depth H in a large, open tank whose side walls are vertical (Fig. P12.77). A... Problem 12.78P: Your uncle is in the below-deck galley of his boat while you are spear fishing in the water nearby.... Problem 12.79P Problem 12.80P: A cylindrical bucket, open at the top, is 25.0 cm high and 10.0 cm in diameter. A circular hole with... Problem 12.81P Problem 12.82P Problem 12.83P: Two very large open tanks A and F (Fig. P12.83) contain the same liquid. A horizontal pipe BCD,... Problem 12.84P: A liquid flowing from a vertical pipe has a definite shape as it flows from the pipe. To get the... Problem 12.85P: DATA The density values in Table 12.1 are listed in increasing order. A chemistry student notices... Problem 12.86P: DATA You have a bucket containing; in unknown liquid. You also have a cube-shaped wooden block that... Problem 12.87P: DATA The Environmental Protection Agency is investigating an abandoned chemical plant. A large,... Problem 12.88CP: A siphon (Fig. P12.88) is a convenient device for removing liquids from containers. To establish the... Problem 12.89PP: For the situation shown, the tissues in the elephants abdomen are at a gauge pressure of 150 mm Hg.... Problem 12.90PP: The maximum force the muscles of the diaphragm can exert is 24,000 N. What maximum pressure... Problem 12.91PP: How does the force the diaphragm experiences due to the difference in pressure between the lungs and... Problem 12.92PP: If the elephant were to snorkel in salt water, which is more dense than freshwater, would the... format_list_bulleted