Question 1

Water is pumped through the hose shown below, from a lower level to an upper level.Compared to the water at point 1, the water at point 2:

Accepted Answer

A) has greater speed and greater pressure 
B) has greater speed and less pressure 
C) has less speed and less pressure 
D) has less speed and greater pressure 
E) has greater speed and the same pressure 
A) has greater speed and greater pressure 
B) has greater speed and less pressure 
C) has less speed and less pressure 
D) has less speed and greater pressure 
E) has greater speed and the same pressure

Question 2

A closed hemispherical shell of radius R is filled with fluid at uniform pressure p.The net force of the fluid on the curved portion of the shell is given by:

Accepted Answer

A) "2$\pi$R2p" 
B) "$\pi$R2p" 
C) "4$\pi$R2p" 
D) "(4/3)$\pi$R2p" 
E) "(4/3)$\pi$R3p" 
A) "2$\pi$R2p" 
B) "$\pi$R2p" 
C) "4$\pi$R2p" 
D) "(4/3)$\pi$R2p" 
E) "(4/3)$\pi$R3p"

Question 3

An object hangs from a spring balance.The balance indicates 30 N in air, 20 N when the object is submerged in water.What does the balance indicate when the object is submerged in liquid with a density that is half of water?

Accepted Answer

A) 20 N 
B) 25 N 
C) 30 N 
D) 35 N 
E) 40 N 
A) 20 N 
B) 25 N 
C) 30 N 
D) 35 N 
E) 40 N

Question 4

A loaded ship passes from a lake (fresh water)to the ocean (salt water).Salt water is denser than fresh water and as a result the ship will:

Accepted Answer

A) ride higher in the water 
B) settle lower in the water 
C) ride at the same level in the water 
D) experience an increase in buoyant force 
E) experience a decrease in buoyant force 
A) ride higher in the water 
B) settle lower in the water 
C) ride at the same level in the water 
D) experience an increase in buoyant force 
E) experience a decrease in buoyant force

Question 5

1.1F1F1F1S  Rank these fluids according to the volume displaced by the object, least to greatest.

Accepted Answer

A) 1, 2, 3 
B) 3, 2, 1 
C) 2, 3, 1 
D) 3, 1, 2 
E) All are the same 
A) 1, 2, 3 
B) 3, 2, 1 
C) 2, 3, 1 
D) 3, 1, 2 
E) All are the same

Question 6

A steel ax and an aluminum piston have the same apparent weight in water.When they are weighed in air:

Accepted Answer

A) they weigh the same 
B) the ax is heavier 
C) the piston is heavier 
D) both weigh less than they did in water 
E) depends on their shapes 
A) they weigh the same 
B) the ax is heavier 
C) the piston is heavier 
D) both weigh less than they did in water 
E) depends on their shapes

Question 7

An airtight box, having a lid of area 80.0 cm2, is partially evacuated.Atmospheric pressure is 1.01 x 105 Pa.A force of 108 lb is required to pull the lid off the box.The pressure in the box was:

Accepted Answer

A) 1.35 x 104 Pa 
B) 2.60 x 104 Pa 
C) 4.10 x 104 Pa 
D) 8.75 x 104 Pa 
E) 1.36 x105 Pa 
A) 1.35 x 104 Pa 
B) 2.60 x 104 Pa 
C) 4.10 x 104 Pa 
D) 8.75 x 104 Pa 
E) 1.36 x105 Pa

Question 8

A bucket resting on the floor of an elevator contains an incompressible fluid of density    .When the elevator has an upward acceleration a the pressure difference between two points in a fluid separated by a vertical distance  $\Delta$ h, is given by:

Accepted Answer

A) "   a $\Delta$ h" 
B) "   g$\Delta$h" 
C) "   (g + a)$\Delta$h" 
D) "   (g - a)$\Delta$h" 
E) "   ga$\Delta$h" 
A) "   a $\Delta$ h" 
B) "   g$\Delta$h" 
C) "   (g + a)$\Delta$h" 
D) "   (g - a)$\Delta$h" 
E) "   ga$\Delta$h"

Question 9

The quantity y appearing in Bernoulli's equation MUST be measured:

Accepted Answer

A) upward from the center of the Earth 
B) upward from the surface of the Earth 
C) upward from the lowest point in the flow 
D) downward from the highest point in the flow 
E) upward from any convenient level 
A) upward from the center of the Earth 
B) upward from the surface of the Earth 
C) upward from the lowest point in the flow 
D) downward from the highest point in the flow 
E) upward from any convenient level

Question 10

A hydraulic press has one piston of diameter 2.0 cm and the other piston of diameter 8.0 cm.What force must be applied to the smaller piston to obtain a force of 1600 N at the larger piston:

Accepted Answer

A) 100 N 
B) 400 N 
C) 1600 N 
D) 6400 N 
E) 26000 N 
A) 100 N 
B) 400 N 
C) 1600 N 
D) 6400 N 
E) 26000 N

Question 11

A student standardizes the concentration of a salt-water solution by slowly adding salt until an egg will just float.The procedure is based on the assumption that:

Accepted Answer

A) all eggs have the same volume 
B) all eggs have the same weight 
C) all eggs have the same density 
D) all eggs have the same shape 
E) the salt tends to neutralize the cholesterol in the egg 
A) all eggs have the same volume 
B) all eggs have the same weight 
C) all eggs have the same density 
D) all eggs have the same shape 
E) the salt tends to neutralize the cholesterol in the egg

Question 12

The equation of continuity for fluid flow can be derived from the conservation of:

Accepted Answer

A) energy 
B) mass 
C) angular momentum 
D) volume 
E) pressure 
A) energy 
B) mass 
C) angular momentum 
D) volume 
E) pressure

Question 13

A 210-g object apparently loses 30 g when suspended in a liquid of density 2.0 g/cm3.The density of the object is:

Accepted Answer

A) 7.0 g/cm3 
B) 3.5 g/cm3 
C) 1.4 g/cm3 
D) 14 g/cm3 
E) none of these 
A) 7.0 g/cm3 
B) 3.5 g/cm3 
C) 1.4 g/cm3 
D) 14 g/cm3 
E) none of these

Question 14

A pirate chest rests at the bottom of an ocean.If the water is still, the net force it exerts on the chest:

Accepted Answer

A) is upward 
B) is downward 
C) is zero 
D) depends on the mass of the chest 
E) depends on the contents of the chest 
A) is upward 
B) is downward 
C) is zero 
D) depends on the mass of the chest 
E) depends on the contents of the chest

Question 15

Water flows through a constriction in a horizontal pipe.As it enters the constriction, the water's:

Accepted Answer

A) speed increases and pressure decreases 
B) speed increases and pressure remains constant 
C) speed increases and pressure increases 
D) speed decreases and pressure increases 
E) speed decreases and pressure decreases 
A) speed increases and pressure decreases 
B) speed increases and pressure remains constant 
C) speed increases and pressure increases 
D) speed decreases and pressure increases 
E) speed decreases and pressure decreases

Question 16

A constriction in a pipe reduces its diameter from 4.0 cm to 2.0 cm.Where the pipe is narrow the water speed is 8.0 m/s.Where it is wide the water speed is:

Accepted Answer

A) 2.0 m/s 
B) 4.0 m/s 
C) 8.0 m/s 
D) 16 m/s 
E) 32 m/s 
A) 2.0 m/s 
B) 4.0 m/s 
C) 8.0 m/s 
D) 16 m/s 
E) 32 m/s

Question 17

A U-tube has dissimilar arms, one having twice the diameter of the other.It contains an incompressible fluid and is fitted with a sliding piston in each arm, with each piston in contact with the fluid.When the piston in the narrow arm is pushed down a distance d, the piston in the wide arm rises a distance:

Accepted Answer

A) d 
B) 2d 
C) d/2 
D) 4d 
E) d/4 
A) d 
B) 2d 
C) d/2 
D) 4d 
E) d/4

Question 18

A certain object floats in fluids of density   Which of the following statements is true?

Accepted Answer

A) the buoyant force of fluid 1 is greater than the buoyant forces of the other two fluids 
B) the buoyant force of fluid 3 is greater than the buoyant forces of the other two fluids 
C) the three fluids exert the same buoyant force 
D) the object displace the same volume of all three fluids 
E) none of these are true 
A) the buoyant force of fluid 1 is greater than the buoyant forces of the other two fluids 
B) the buoyant force of fluid 3 is greater than the buoyant forces of the other two fluids 
C) the three fluids exert the same buoyant force 
D) the object displace the same volume of all three fluids 
E) none of these are true

Question 19

Water (density = 1.0 x103 kg/m3)flows downhill through a pipe of diameter 1.5 cm.Its speed at the top of the hill is 7.2 m/s.If the hill is 9.5 m high, what is the gravitational potential energy density of the water at the top of the hill relative to the bottom?

Accepted Answer

A) cannot be calculated without knowing the pressure 
B) 120 J/m3 
C) 7.2 x 103 J/m3 
D) 9.5 x 103 J/m3 
E) 9.3 x 104 J/m3 
A) cannot be calculated without knowing the pressure 
B) 120 J/m3 
C) 7.2 x 103 J/m3 
D) 9.5 x 103 J/m3 
E) 9.3 x 104 J/m3

Question 20

Water is pumped into one end of a long pipe at the rate of 40 L/min.It emerges at the other end at 24 L/min.A possible reason for this decrease in flow is:

Accepted Answer

A) the water is being pumped uphill 
B) the water is being pumped downhill 
C) the diameter of the pipe is not the same at the two ends 
D) friction in the pipe 
E) a leak in the pipe 
A) the water is being pumped uphill 
B) the water is being pumped downhill 
C) the diameter of the pipe is not the same at the two ends 
D) friction in the pipe 
E) a leak in the pipe

Exam 14: Fluids

Water is pumped through the hose shown below, from a lower level to an upper level.Compared to the water at point 1, the water at point 2:

A closed hemispherical shell of radius R is filled with fluid at uniform pressure p.The net force of the fluid on the curved portion of the shell is given by:

An object hangs from a spring balance.The balance indicates 30 N in air, 20 N when the object is submerged in water.What does the balance indicate when the object is submerged in liquid with a density that is half of water?

A loaded ship passes from a lake (fresh water)to the ocean (salt water).Salt water is denser than fresh water and as a result the ship will:

1.1 Rank these fluids according to the volume displaced by the object, least to greatest.

A steel ax and an aluminum piston have the same apparent weight in water.When they are weighed in air:

An airtight box, having a lid of area 80.0 cm2, is partially evacuated.Atmospheric pressure is 1.01 x 105 Pa.A force of 108 lb is required to pull the lid off the box.The pressure in the box was:

A bucket resting on the floor of an elevator contains an incompressible fluid of density .When the elevator has an upward acceleration a the pressure difference between two points in a fluid separated by a vertical distance Δ\DeltaΔ h, is given by:

The quantity y appearing in Bernoulli's equation MUST be measured:

A hydraulic press has one piston of diameter 2.0 cm and the other piston of diameter 8.0 cm.What force must be applied to the smaller piston to obtain a force of 1600 N at the larger piston:

A student standardizes the concentration of a salt-water solution by slowly adding salt until an egg will just float.The procedure is based on the assumption that:

The equation of continuity for fluid flow can be derived from the conservation of:

A 210-g object apparently loses 30 g when suspended in a liquid of density 2.0 g/cm3.The density of the object is:

A pirate chest rests at the bottom of an ocean.If the water is still, the net force it exerts on the chest:

Water flows through a constriction in a horizontal pipe.As it enters the constriction, the water's:

A constriction in a pipe reduces its diameter from 4.0 cm to 2.0 cm.Where the pipe is narrow the water speed is 8.0 m/s.Where it is wide the water speed is:

A certain object floats in fluids of density Which of the following statements is true?

Water (density = 1.0 x103 kg/m3)flows downhill through a pipe of diameter 1.5 cm.Its speed at the top of the hill is 7.2 m/s.If the hill is 9.5 m high, what is the gravitational potential energy density of the water at the top of the hill relative to the bottom?

Water is pumped into one end of a long pipe at the rate of 40 L/min.It emerges at the other end at 24 L/min.A possible reason for this decrease in flow is:

Measurement

Motion Along a Straight Line

Vectors

Motion in Two and Three Dimensions

Force and Motion

Force and Motion

Kinetic Energy and Work

Potential Energy and Conservation of Energy

Center of Mass and Linear Momentum

Rotation

Rolling, Torque, and Angular Momentum

Equilibrium and Elasticity

Gravitation

Oscillations

Waves

Waves

Temperature, Heat, and the First Law of Thermodynamics

The Kinetic Theory of Gases

Entropy and the Second Law of Thermodynamics

Coulombs Law

Electric Fields

Gauss Law

Electric Potential

Capacitance

Current and Resistance

Circuits

Magnetic Fields

Magnetic Fields Due to Currents

Induction and Inductance

Electromagnetic Oscillations and Alternating Current

Maxwells Equations; Magnetism of Matter

Electromagnetic Waves

Images

Interference 1

Diffraction

Relativity

Photons and Matter Waves

More About Matter Waves

All About Atoms

Conduction of Electricity in Solids

Energy From the Nucleus

Quarks, Leptons, and the Big Bang

Filters

An airtight box, having a lid of area 80.0 cm², is partially evacuated.Atmospheric pressure is 1.01 x 10⁵ Pa.A force of 108 lb is required to pull the lid off the box.The pressure in the box was:

A 210-g object apparently loses 30 g when suspended in a liquid of density 2.0 g/cm³.The density of the object is:

Water (density = 1.0 x10³ kg/m³)flows downhill through a pipe of diameter 1.5 cm.Its speed at the top of the hill is 7.2 m/s.If the hill is 9.5 m high, what is the gravitational potential energy density of the water at the top of the hill relative to the bottom?