Question 1

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

Question 2

All fluids are:

Accepted Answer

A)  gases 
B)  liquids 
C)  gases or liquids 
D)  non-metallic 
E)  transparent 
A)  gases 
B)  liquids 
C)  gases or liquids 
D)  non-metallic 
E)  transparent

Question 3

An object floats on the surface of a fluid. For purposes of calculating the torque on it, the buoyant force is taken to act at:

Accepted Answer

A)  the center of the bottom surface of the object 
B)  the center of gravity of the object 
C)  the center of gravity of the fluid that the object replaced 
D)  the geometric center of the object 
E)  none of the above 
A)  the center of the bottom surface of the object 
B)  the center of gravity of the object 
C)  the center of gravity of the fluid that the object replaced 
D)  the geometric center of the object 
E)  none of the above

Question 4

Gases may be distinguished from other forms of matter by their:

Accepted Answer

A)  lack of color 
B)  small atomic weights 
C)  inability to form free surfaces 
D)  ability to flow 
E)  ability to exert a buoyant force 
A)  lack of color 
B)  small atomic weights 
C)  inability to form free surfaces 
D)  ability to flow 
E)  ability to exert a buoyant force

Question 5

The diagram shows a U-tube having cross-sectional area A and partially filled with oil of density $\rho$. A solid cylinder, which fits the tube tightly but can slide without friction, is placed in the right arm. The system reaches equilibrium. The weight of the cylinder is:

Accepted Answer

A)  AL$\rho$g 
B)  L3$\rho$g 
C)  A$\rho$(L + h)g 
D)  A$\rho$(L - h)g 
E)  none of these 
A)  AL$\rho$g 
B)  L3$\rho$g 
C)  A$\rho$(L + h)g 
D)  A$\rho$(L - h)g 
E)  none of these

Question 6

A rock, which weighs 1400 N in air, has an apparent weight of 900 N when submerged in fresh water (998 kg/m3). The volume of the rock is:

Accepted Answer

A)  0.14 m3 
B)  0.60 m3 
C)  0.90 m3 
D)  5.1 * 10-2 m3 
E)  9.2 * 10-2 m3 
A)  0.14 m3 
B)  0.60 m3 
C)  0.90 m3 
D)  5.1 * 10-2 m3 
E)  9.2 * 10-2 m3

Question 7

1.1$\rho$0 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 8

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 9

Two balls have the same shape and size but one is denser than the other. If frictional forces are negligible when they are dropped in air, which has the greater acceleration?

Accepted Answer

A)  The heavier ball 
B)  The lighter ball 
C)  They have the same acceleration 
D)  The heavier ball if atmospheric pressure is high, they lighter ball if it is low 
E)  The lighter ball if atmospheric pressure is high, the heavier ball if it is low 
A)  The heavier ball 
B)  The lighter ball 
C)  They have the same acceleration 
D)  The heavier ball if atmospheric pressure is high, they lighter ball if it is low 
E)  The lighter ball if atmospheric pressure is high, the heavier ball if it is low

Question 10

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 11

A blast of wind tips a sailboat in the clockwise direction when viewed from the stern. When the wind ceases the boat rotates back toward the upright position if, when it is tilted, the center of buoyancy:

Accepted Answer

A)  is above the center of gravity 
B)  is below the center of gravity 
C)  is to the right of the center of gravity 
D)  is to the left of the center of gravity 
E)  coincides with the center of gravity 
A)  is above the center of gravity 
B)  is below the center of gravity 
C)  is to the right of the center of gravity 
D)  is to the left of the center of gravity 
E)  coincides with the center of gravity

Question 12

The pressure exerted on the ground by a man is greatest when:

Accepted Answer

A)  he stands with both feet flat on the ground 
B)  he stands flat on one foot 
C)  he stands on the toes of one foot 
D)  he lies down on the ground 
E)  all of the above yield the same pressure 
A)  he stands with both feet flat on the ground 
B)  he stands flat on one foot 
C)  he stands on the toes of one foot 
D)  he lies down on the ground 
E)  all of the above yield the same pressure

Question 13

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 14

The hydraulic automobile jack illustrates:

Accepted Answer

A)  Archimedes' principle 
B)  Pascal's principle 
C)  Hooke's law 
D)  Newton's third law 
E)  Newton's second law 
A)  Archimedes' principle 
B)  Pascal's principle 
C)  Hooke's law 
D)  Newton's third law 
E)  Newton's second law

Question 15

A block of ice at 0$\degree$C containing a piece of cork is floating on the surface of ice water in a beaker. When the ice has melted the water level:

Accepted Answer

A)  is higher 
B)  is lower 
C)  is the same 
D)  depends on the initial ratio of water to ice 
E)  depends on the shape of the ice block 
A)  is higher 
B)  is lower 
C)  is the same 
D)  depends on the initial ratio of water to ice 
E)  depends on the shape of the ice block

Question 16

A tin can has a volume of 1000 cm3 and a mass of 100 g. Approximately what mass of lead shot can it carry without sinking in water?

Accepted Answer

A)  900 g 
B)  100 g 
C)  1000 g 
D)  1100 g 
E)  980 g 
A)  900 g 
B)  100 g 
C)  1000 g 
D)  1100 g 
E)  980 g

Question 17

Mercury is a convenient liquid to use in a barometer because:

Accepted Answer

A)  it is a metal 
B)  it has a high boiling point 
C)  it expands little with temperature 
D)  it has a high density 
E)  it looks silvery 
A)  it is a metal 
B)  it has a high boiling point 
C)  it expands little with temperature 
D)  it has a high density 
E)  it looks silvery

Question 18

A certain object floats in fluids of density
 
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 19

A non-viscous incompressible fluid is pumped steadily into the narrow end of a long tapered pipe and emerges from the wide end. The pressure at the input is greater than at the output. A possible explanation is:

Accepted Answer

A)  the fluid speed increases from input to output 
B)  the fluid speed is the same at the two ends 
C)  the fluid is flowing uphill 
D)  the fluid is flowing downhill 
E)  the fluid is flowing horizontally 
A)  the fluid speed increases from input to output 
B)  the fluid speed is the same at the two ends 
C)  the fluid is flowing uphill 
D)  the fluid is flowing downhill 
E)  the fluid is flowing horizontally

Question 20

The density of water is 1.0 g/cm3. The density of the oil in the left column of the U-tube shown below is:

Accepted Answer

A)  0.20 g/cm3 
B)  0.80 g/cm3 
C)  1.0 g/cm3 
D)  1.3 g/cm3 
E)  5.0 g/cm3 
A)  0.20 g/cm3 
B)  0.80 g/cm3 
C)  1.0 g/cm3 
D)  1.3 g/cm3 
E)  5.0 g/cm3

Exam 14: Fluids

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:

All fluids are:

An object floats on the surface of a fluid. For purposes of calculating the torque on it, the buoyant force is taken to act at:

Gases may be distinguished from other forms of matter by their:

The diagram shows a U-tube having cross-sectional area A and partially filled with oil of density ρ\rhoρ . A solid cylinder, which fits the tube tightly but can slide without friction, is placed in the right arm. The system reaches equilibrium. The weight of the cylinder is:

A rock, which weighs 1400 N in air, has an apparent weight of 900 N when submerged in fresh water (998 kg/m3). The volume of the rock is:

1.1 ρ\rhoρ 0 Rank these fluids according to the volume displaced by the object, least to greatest.

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:

Two balls have the same shape and size but one is denser than the other. If frictional forces are negligible when they are dropped in air, which has the greater acceleration?

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

A blast of wind tips a sailboat in the clockwise direction when viewed from the stern. When the wind ceases the boat rotates back toward the upright position if, when it is tilted, the center of buoyancy:

The pressure exerted on the ground by a man is greatest when:

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:

The hydraulic automobile jack illustrates:

A block of ice at 0 °\degree° C containing a piece of cork is floating on the surface of ice water in a beaker. When the ice has melted the water level:

A tin can has a volume of 1000 cm3 and a mass of 100 g. Approximately what mass of lead shot can it carry without sinking in water?

Mercury is a convenient liquid to use in a barometer because:

A certain object floats in fluids of density Rank these fluids according to the volume displaced by the object, least to greatest.

A non-viscous incompressible fluid is pumped steadily into the narrow end of a long tapered pipe and emerges from the wide end. The pressure at the input is greater than at the output. A possible explanation is:

The density of water is 1.0 g/cm3. The density of the oil in the left column of the U-tube shown below is:

Measurement

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Filters

A rock, which weighs 1400 N in air, has an apparent weight of 900 N when submerged in fresh water (998 kg/m³). The volume of the rock is:

1.1 $\rho$ ₀ Rank these fluids according to the volume displaced by the object, least to greatest.

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 block of ice at 0 $\degree$ C containing a piece of cork is floating on the surface of ice water in a beaker. When the ice has melted the water level:

A tin can has a volume of 1000 cm³ and a mass of 100 g. Approximately what mass of lead shot can it carry without sinking in water?

The density of water is 1.0 g/cm³. The density of the oil in the left column of the U-tube shown below is: