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Exam 13: Fluids

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Question 1

Multiple Choice

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A waitress fills your water glass with ice water (containing many ice cubes) such that the liquid water is perfectly level with the rim of the glass.As the ice melts,

A) the liquid-water level remains flush with the rim of the glass.
B) the liquid-water level rises,causing water to run down the outside of the glass.
C) the liquid-water level decreases.

Correct Answer

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A

Question 2

Multiple Choice

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A 8.6 kg solid sphere,made of metal whose density is 3400 kg/m³,is suspended by a cord.When the sphere is immersed in a liquid of unknown density,the tension in the cord is 38 N.The density of the liquid is closest to:

A) 1900 kg/m³
B) 1700 kg/m³
C) 1600 kg/m³
D) 1500 kg/m³
E) 1400 kg/m³

Correct Answer

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A

Question 3

Multiple Choice

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A wooden block contains some nails so that its density is exactly equal to that of water.If it is placed in a tank of water and released from rest when it is completely submerged,it will

An air bubble underwater has the same pressure as that of the water.As the air bubble rises toward the surface (and its temperature remains constant) ,the volume of the air bubble

Consider a brick that is totally immersed in water.The long edge of the brick is vertical.The pressure on the brick is

A cap 7.000 cm in diameter plugs an opening in a spherical container 1.000 m in diameter at atmospheric pressure.The container is submerged to a depth of 10.00 ft in water.What force is needed to remove the plug? Assume the plug is planar and the pressure over the container is equalized.

The Tonga Trench in the Pacific Ocean is 36,000 feet deep.Assuming that sea water has an average density of 1.04 g/cm³,calculate the absolute pressure at the bottom of the trench in atmospheres.

-A container has a vertical tube,whose inner radius is 24.00 mm,connected to it at its side.An unknown liquid reaches level A in the container and level B in the tube-level A being 5.0 cm higher than level B.The liquid supports a 20.0 cm high column of oil,between levels B and C,whose density is 570 kg/m³.In the figure,the mass of the oil,in grams,is closest to:

How many logs 3.00 m long and 18.0 cm in diameter are needed to just barely float a 2500.0 kg car? (ρwood = 0.720 g/cm³)

A 200.0 kg flat-bottomed boat floats in fresh water,which has a density of 1000.0 kg/m³.Assuming that the base of the boat is 1.42 m wide and 4.53 m long,how much of the boat is submerged when it carries three passengers whose total mass is 193 kg?

Water flows through a pipe having a varying width.More water flows per second through the wide section than through the narrow section because there is more room for it to flow.

An aspirator operates as a pump.Water flows by a small tube perpendicular to the flow of the water.If the water flows at 3.7 m/s,what pressure differential is present if the other end of the tube is maintained at atmospheric pressure?

The body takes a mass of air into the lungs directly proportional to the ambient pressure.A diver who uses 27 psi/min at sea level has an air tank initially containing 1800 psi.How long can the diver work at a water depth of 40.0 ft.?

If you increase the pressure on the surface of a can of water,you will increase the buoyant force on objects placed in that water.

A standard atmosphere has a pressure versus altitude relation approximated by With α = 0.116 km-1.An aircraft flies at 30,000 ft but maintains a cabin pressure of that at 8000 ft.What force is exerted by air pressure on a square meter of cabin wall area?

Calculate the pressure exerted on the ground by a 79 kgperson standing on one foot.Assume that the bottom of the person's foot is 13 cm wide and 28 cm long.

A spherical ball of lead (density 11.3 g/cm³) is placed in a tub of mercury (density 13.6 g/cm³) .Which answer best describes the result?

The Bernoulli effect is responsible for the lift force on an airplane wing.Wings must therefore be designed so as to insure that

A football coach in hopes of improving his kicker's performance fills a 0.9 kg football with helium rather than air.Assuming that the football contains a volume of helium equal to the air it replaces at standard temperature and pressure,what change in relative weight of the football (change in weight divided by weight) is to be expected? The volume of the football is 1.6 l.

If the hydrostatic pressure at a certain depth in the ocean is 2 atm,the hydrostatic pressure will be 4 atm if you go twice as deep.