Question 1

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,

Accepted Answer

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. 
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. A

Question 2

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.?

Accepted Answer

A) 31 min 
B) 56 min 
C) 107 min 
D) 2 min 
A) 31 min 
B) 56 min 
C) 107 min 
D) 2 min A

Question 3

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:

Accepted Answer

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

Question 4

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.

Accepted Answer

A) 1.1 × 103 atm 
B) 1.1 × 108 atm 
C) 1.1 × 105 atm 
D) 1.1 × 106 atm 
E) 2.1 atm 
A) 1.1 × 103 atm 
B) 1.1 × 108 atm 
C) 1.1 × 105 atm 
D) 1.1 × 106 atm 
E) 2.1 atm

Question 5

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)

Accepted Answer

A) 118 
B) 117 
C) 30 
D) 29 
A) 118 
B) 117 
C) 30 
D) 29

Question 6

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.

Accepted Answer

A) 2.1 × 104 Pa 
B) 2.2 × 103 Pa 
C) 4.8 × 104 Pa 
D) 5.3 × 104 Pa 
A) 2.1 × 104 Pa 
B) 2.2 × 103 Pa 
C) 4.8 × 104 Pa 
D) 5.3 × 104 Pa

Question 7

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.

Accepted Answer

A) 1.81 × 10-3 
B) 1.42 × 10-3 
C) 1.96 × 10-4 
D) 1.01 × 10-3 
A) 1.81 × 10-3 
B) 1.42 × 10-3 
C) 1.96 × 10-4 
D) 1.01 × 10-3

Question 8

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

Accepted Answer

A) rise to the surface. 
B) sink to the bottom. 
C) remain where it is released. 
A) rise to the surface. 
B) sink to the bottom. 
C) remain where it is released.

Question 9

-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:

Accepted Answer

A) 210 
B) 410 
C) 620 
D) 820 
E) 1000 
A) 210 
B) 410 
C) 620 
D) 820 
E) 1000

Question 10

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

Accepted Answer

A) increases. 
B) decreases. 
C) remains constant. 
D) increases or decreases,depending on the rate it rises. 
A) increases. 
B) decreases. 
C) remains constant. 
D) increases or decreases,depending on the rate it rises.

Question 11

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

Accepted Answer

A) the same on all surfaces of the brick. 
B) greatest on the face with largest area. 
C) greatest on the top of the brick. 
D) greatest on the sides of the brick. 
E) greatest on the bottom of the brick. 
A) the same on all surfaces of the brick. 
B) greatest on the face with largest area. 
C) greatest on the top of the brick. 
D) greatest on the sides of the brick. 
E) greatest on the bottom of the brick.

Question 12

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.

Accepted Answer

A) True 
 B)False

Question 13

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?

Accepted Answer

A) 4.1 × 104 N 
B) 124 N 
C) 3.5 × 104 N 
D) 7.6 × 104 N 
A) 4.1 × 104 N 
B) 124 N 
C) 3.5 × 104 N 
D) 7.6 × 104 N

Question 14

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

Accepted Answer

A) air molecules will be deflected downward when they hit the wing. 
B) air molecules will be deflected upward when they hit the wing. 
C) air molecules move more rapidly past the upper surface of the wing than past the lower surface. 
D) air molecules move more rapidly past the lower surface of the wing than past the upper surface. 
E) wings are thick enough to create a significant pressure difference between the top and bottom surfaces of the wings because of the different heights of these surfaces. 
A) air molecules will be deflected downward when they hit the wing. 
B) air molecules will be deflected upward when they hit the wing. 
C) air molecules move more rapidly past the upper surface of the wing than past the lower surface. 
D) air molecules move more rapidly past the lower surface of the wing than past the upper surface. 
E) wings are thick enough to create a significant pressure difference between the top and bottom surfaces of the wings because of the different heights of these surfaces.

Question 15

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?

Accepted Answer

A) The lead ball will float with about 83% of its volume above the surface of the mercury. 
B) The lead ball will float with its top exactly even with the surface of the mercury. 
C) The lead ball will float with about 17% of its volume above the surface of the mercury. 
D) The lead will sink to the bottom of the mercury. 
E) None of the above 
A) The lead ball will float with about 83% of its volume above the surface of the mercury. 
B) The lead ball will float with its top exactly even with the surface of the mercury. 
C) The lead ball will float with about 17% of its volume above the surface of the mercury. 
D) The lead will sink to the bottom of the mercury. 
E) None of the above

Question 16

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.

Accepted Answer

A) 115 N 
B) 460 N 
C) 4.608 × 106 N 
D) 378 N 
A) 115 N 
B) 460 N 
C) 4.608 × 106 N 
D) 378 N

Question 17

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.

Accepted Answer

A) True 
 B)False

Question 18

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?

Accepted Answer

A) 6.11 cm 
B) 6.48 cm 
C) 6.84 cm 
D) 7.33 cm 
A) 6.11 cm 
B) 6.48 cm 
C) 6.84 cm 
D) 7.33 cm

Question 19

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.

Accepted Answer

A) True 
 B)False

Question 20

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?

Accepted Answer

A) 0.93 atm 
B) 0.69 atm 
C) 0.31 atm 
D) -0.31 atm 
A) 0.93 atm 
B) 0.69 atm 
C) 0.31 atm 
D) -0.31 atm

Exam 13: Fluids

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,

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.?

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:

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.

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)

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 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

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.

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?

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

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?

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.

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 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?

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.

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?

Representing Motion

Motion in One Dimension

Vectors and Motion in Two Dimensions

Forces and Newtons Laws of Motion

Applying Newtons Laws

Circular Motion,orbits,and Gravity

Rotational Motion

Equilibrium and Elasticity

Momentum

Energy and Work

Using Energy

Thermal Properties of Matter

Oscillations

Traveling Waves and Sound

Superposition and Standing Waves

Wave Optics

Ray Optics

Optical Instruments

Electric Fields and Forces

Electric Potential

Current and Resistance

Circuits

Magnetic Fields and Forces

Electromagnetic Induction and Electromagnetic Waves

Ac Electricity

Relativity

Quantum Physics

Atoms and Molecules

Nuclear Physics

Filters

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:

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.

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 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?

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?