Question 1

A horizontal pipe narrows from a diameter of 10 to 5 cm.For a nonviscous fluid flowing from the larger diameter to the smaller,

Accepted Answer

A) the velocity and pressure both increase. 
B) the velocity increases and the pressure decreases. 
C) the velocity decreases and the pressure increases. 
D) the velocity and pressure both decrease. 
E) either the velocity or the pressure changes but not both. 
A) the velocity and pressure both increase. 
B) the velocity increases and the pressure decreases. 
C) the velocity decreases and the pressure increases. 
D) the velocity and pressure both decrease. 
E) either the velocity or the pressure changes but not both. D

Question 2

When Bernoulli's equation is written in the form   the constant C represents the

Accepted Answer

A) energy per unit mass. 
B) energy per unit volume. 
C) net work done by outside forces. 
D) power supplied by outside sources. 
E) mass flow per unit time. 
A) energy per unit mass. 
B) energy per unit volume. 
C) net work done by outside forces. 
D) power supplied by outside sources. 
E) mass flow per unit time. A

Question 3

A metal block suspended from a spring balance is submerged in water.You observe that the block displaces 55 cm3 of water and that the balance reads 4.3 N.What is the density of the block?

Accepted Answer

A) 7.0 g/cm3  
B) 8.0 g/cm3  
C) 9.0 g/cm3  
D) 1.1 g/cm3  
E) 1.2 g/cm3  
A) 7.0 g/cm3  
B) 8.0 g/cm3  
C) 9.0 g/cm3  
D) 1.1 g/cm3  
E) 1.2 g/cm3  C

Question 4

If a column of liquid 52 cm high supports a column of mercury ($\rho$
 = 13.6 g/cm3)10 cm high,the density of the liquid is

Accepted Answer

A) 6.0 g/cm3  
B) 2.6 g/cm3  
C) 3.8 g/cm3  
D) 4.9 g/cm3  
E) 5.0 g/cm3  
A) 6.0 g/cm3  
B) 2.6 g/cm3  
C) 3.8 g/cm3  
D) 4.9 g/cm3  
E) 5.0 g/cm3

Question 5

A block of ice 30.5 cm thick floating in fresh water just supports a man weighing 801 N.If the specific gravity of ice is 0.917,the smallest area the block can have is

Accepted Answer

A) 3.25 m2  
B) 3.57 m2  
C) 2.88 m2  
D) 1.45 m2  
E) 0.269 m2  
A) 3.25 m2  
B) 3.57 m2  
C) 2.88 m2  
D) 1.45 m2  
E) 0.269 m2

Question 6

Water from a tap is flowing at a uniform rate of 24 cm3/s into a cylindrical container.An exit tube is mounted on the side of the container at height h/2 from the base.The height h of the water remains constant.The volume flow at which the water leaves the container is

Accepted Answer

A) 12 cm3/s 
B) 24 cm3/s 
C) 36 cm3/s 
D) 48 cm3/s 
E) 72 cm3/s 
A) 12 cm3/s 
B) 24 cm3/s 
C) 36 cm3/s 
D) 48 cm3/s 
E) 72 cm3/s

Question 7

Two objects with different volumes have the same apparent weight when submerged in water.If they are placed in a vacuum,

Accepted Answer

A) both weigh less than before. 
B) the one with the smaller volume weighs less than the other. 
C) the one with the smaller volume weighs more than the other. 
D) they weigh the same. 
E) both weigh more than before. 
A) both weigh less than before. 
B) the one with the smaller volume weighs less than the other. 
C) the one with the smaller volume weighs more than the other. 
D) they weigh the same. 
E) both weigh more than before.

Question 8

A container of height,h,is filled with water of density $\rho$,and sealed with a flexible membrane.The container is placed in the space shuttle in orbit.If the air pressure in the shuttle is Po,the pressure in the middle of the container is

Accepted Answer

A) Po 
B) Po +   $\rho$gh 
C)    $\rho$gh 
D) $\rho$gh 
E) depends how fast the shuttle is moving 
A) Po 
B) Po +   $\rho$gh 
C)    $\rho$gh 
D) $\rho$gh 
E) depends how fast the shuttle is moving

Question 9

Your blood pressure is reported as 50 mm of Hg.The density of mercury is 13.6 g/cm3.Your pressure is equivalent to

Accepted Answer

A) 6.7 $\times$ 106 Pa 
B) 6.8 Pa 
C) 6.8 $\times$ 102 Pa 
D) 6.7 $\times$ 103 Pa 
E) 3.2 $\times$ 102 Pa 
A) 6.7 $\times$ 106 Pa 
B) 6.8 Pa 
C) 6.8 $\times$ 102 Pa 
D) 6.7 $\times$ 103 Pa 
E) 3.2 $\times$ 102 Pa

Question 10

According to Pascal's principle,the pressure at every point in a confined liquid

Accepted Answer

A) depends only on the density of the liquid. 
B) is equal to the weight of the liquid. 
C) is the same. 
D) is changed the same amount by an externally applied pressure. 
E) is equal to the externally applied pressure. 
A) depends only on the density of the liquid. 
B) is equal to the weight of the liquid. 
C) is the same. 
D) is changed the same amount by an externally applied pressure. 
E) is equal to the externally applied pressure.

Question 11

Using a motion sensor,Sean finds that the acceleration of a 2-kg rock that has been dropped from the roof of a building is 5.5 m/s2.He concludes that the magnitude of force of air resistance acting on the rock is approximately

Accepted Answer

A) 19.6 N 
B) 11.0 N 
C) 9.81 N 
D) 6.62 N 
E) None of these is correct. 
A) 19.6 N 
B) 11.0 N 
C) 9.81 N 
D) 6.62 N 
E) None of these is correct.

Question 12

A smooth stone is falling with its constant terminal velocity in a viscous liquid.The density of the stone is 2.89 $\times$ 103 kg/m3,and the density of the liquid is 1.34 $\times$ 103 kg/m3.The volume of the stone is 2.15 $\times$ 10-6 m3.The drag force F of the liquid on the stone is given by F = 3.52v in SI units,where v is the terminal velocity.The value of v is

Accepted Answer

A) 8.5 $\times$ 10-3 m/s 
B) 1.1 $\times$ 10-2 m/s 
C) 3.2 $\times$ 10-2 m/s 
D) 1.7 $\times$ 10-2 m/s 
E) 1.7 $\times$ 10-3 m/s 
A) 8.5 $\times$ 10-3 m/s 
B) 1.1 $\times$ 10-2 m/s 
C) 3.2 $\times$ 10-2 m/s 
D) 1.7 $\times$ 10-2 m/s 
E) 1.7 $\times$ 10-3 m/s

Question 13

At what depth in sea water is the gauge pressure equal to 1 atm? The density of sea water is 1.03 $\times$ 103 kg/m3.

Accepted Answer

A) 5 m 
B) 7.5 m 
C) 10 m 
D) 15 m 
E) 20 m 
A) 5 m 
B) 7.5 m 
C) 10 m 
D) 15 m 
E) 20 m

Question 14

A wind with speed 45 m/s blows across a roof 20 m long and 12 m wide.The pressure inside the room is 1 atm.What is the net force on this roof due to the pressure difference inside and outside the roof? (The density of air is equal to 1.3 kg/m3.)

Accepted Answer

A) 3.2 $\times$ 105 N 
B) 2.4 $\times$ 107 N 
C) 6.3 $\times$ 105 N 
D) 7.0 $\times$ 103 N 
E) 3.2 $\times$ 108 N 
A) 3.2 $\times$ 105 N 
B) 2.4 $\times$ 107 N 
C) 6.3 $\times$ 105 N 
D) 7.0 $\times$ 103 N 
E) 3.2 $\times$ 108 N

Question 15

A block of wood of mass 400 g and density 0.8 g/cm3 is floating on the surface of a liquid of density 1.3 g/cm3.What is the difference in mass of stone (density = 1.9 g/cm3)that must be added to the block in order for the combination (wood and stone)to be just submerged rather than only the wood to be submerged?

Accepted Answer

A) 250 g 
B) 540 g 
C) 170 g 
D) 790 g 
E) none of the above 
A) 250 g 
B) 540 g 
C) 170 g 
D) 790 g 
E) none of the above

Question 16

Which of the following are the SI units for specific gravity?

Accepted Answer

A) kg/m3  
B) g/cm3  
C) lb/ft3  
D) lb · s2/ft4  
E) specific gravity has no units 
A) kg/m3  
B) g/cm3  
C) lb/ft3  
D) lb · s2/ft4  
E) specific gravity has no units

Question 17

A hurricane strength wind is blowing at a speed of 100 km/hr over a flat roof of 100 m2.Assuming the inside of the house to be at 1 atm pressure and the density of air is 1.3 kg/m3,calculate the pressure difference between the inside and the outside of the roof.

Accepted Answer

A) 500 Pa lower outside 
B) 1000 Pa higher outside 
C) 500 Pa lower inside 
D) 1000 Pa lower outside 
E) 18 Pa lower outside 
A) 500 Pa lower outside 
B) 1000 Pa higher outside 
C) 500 Pa lower inside 
D) 1000 Pa lower outside 
E) 18 Pa lower outside

Question 18

A uniform cylinder of wood of length 25 cm is floating vertically upright in a dual layered fluid.An oil layer (of density 0.9 g/cm3)that is 9 cm deep lies above a depth of water.If only 5 cm of wood lies above the oil surface calculate the density of the wood.

Accepted Answer

A) 0.76 g/ cm3  
B) 0.80 g/ cm3  
C) 0.70 g/ cm3  
D) 0.66 g/ cm3  
E) none of the above 
A) 0.76 g/ cm3  
B) 0.80 g/ cm3  
C) 0.70 g/ cm3  
D) 0.66 g/ cm3  
E) none of the above

Question 19

As part of a science project you investigate the effect of punching holes in a plastic container of water and observing the flow of liquid out of the different holes.If the container has a water level 20 cm above the base and you punch a hole in the side 12 cm high,calculate the speed at which water will initially flow out of the hole.

Accepted Answer

A) 1.25 m/s 
B) 15.3 m/s 
C) 12.5 m/s 
D) 1.50 m/s 
E) 2.25 m/s 
A) 1.25 m/s 
B) 15.3 m/s 
C) 12.5 m/s 
D) 1.50 m/s 
E) 2.25 m/s

Question 20

A pipe of 2.54 cm inside diameter has a constriction in which the inside diameter is 1.27 cm.If water is flowing through this pipe with a velocity of 1.22 m/s in the main section,the velocity in the constricted section is

Accepted Answer

A) 0.305 m/s 
B) 0.610 m/s 
C) 2.44 m/s 
D) 1.22 m/s 
E) 4.88 m/s 
A) 0.305 m/s 
B) 0.610 m/s 
C) 2.44 m/s 
D) 1.22 m/s 
E) 4.88 m/s

Exam 13: Fluids

A horizontal pipe narrows from a diameter of 10 to 5 cm.For a nonviscous fluid flowing from the larger diameter to the smaller,

When Bernoulli's equation is written in the form the constant C represents the

A metal block suspended from a spring balance is submerged in water.You observe that the block displaces 55 cm3 of water and that the balance reads 4.3 N.What is the density of the block?

If a column of liquid 52 cm high supports a column of mercury ( ρ\rhoρ = 13.6 g/cm3)10 cm high,the density of the liquid is

A block of ice 30.5 cm thick floating in fresh water just supports a man weighing 801 N.If the specific gravity of ice is 0.917,the smallest area the block can have is

Water from a tap is flowing at a uniform rate of 24 cm3/s into a cylindrical container.An exit tube is mounted on the side of the container at height h/2 from the base.The height h of the water remains constant.The volume flow at which the water leaves the container is

Two objects with different volumes have the same apparent weight when submerged in water.If they are placed in a vacuum,

A container of height,h,is filled with water of density ρ\rhoρ ,and sealed with a flexible membrane.The container is placed in the space shuttle in orbit.If the air pressure in the shuttle is Po,the pressure in the middle of the container is

Your blood pressure is reported as 50 mm of Hg.The density of mercury is 13.6 g/cm3.Your pressure is equivalent to

According to Pascal's principle,the pressure at every point in a confined liquid

Using a motion sensor,Sean finds that the acceleration of a 2-kg rock that has been dropped from the roof of a building is 5.5 m/s2.He concludes that the magnitude of force of air resistance acting on the rock is approximately

At what depth in sea water is the gauge pressure equal to 1 atm? The density of sea water is 1.03 ×\times× 103 kg/m3.

A wind with speed 45 m/s blows across a roof 20 m long and 12 m wide.The pressure inside the room is 1 atm.What is the net force on this roof due to the pressure difference inside and outside the roof? (The density of air is equal to 1.3 kg/m3.)

Which of the following are the SI units for specific gravity?

A hurricane strength wind is blowing at a speed of 100 km/hr over a flat roof of 100 m2.Assuming the inside of the house to be at 1 atm pressure and the density of air is 1.3 kg/m3,calculate the pressure difference between the inside and the outside of the roof.

A uniform cylinder of wood of length 25 cm is floating vertically upright in a dual layered fluid.An oil layer (of density 0.9 g/cm3)that is 9 cm deep lies above a depth of water.If only 5 cm of wood lies above the oil surface calculate the density of the wood.

A pipe of 2.54 cm inside diameter has a constriction in which the inside diameter is 1.27 cm.If water is flowing through this pipe with a velocity of 1.22 m/s in the main section,the velocity in the constricted section is

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A metal block suspended from a spring balance is submerged in water.You observe that the block displaces 55 cm³ of water and that the balance reads 4.3 N.What is the density of the block?

If a column of liquid 52 cm high supports a column of mercury ( $\rho$ = 13.6 g/cm³)10 cm high,the density of the liquid is

Water from a tap is flowing at a uniform rate of 24 cm³/s into a cylindrical container.An exit tube is mounted on the side of the container at height h/2 from the base.The height h of the water remains constant.The volume flow at which the water leaves the container is

A container of height,h,is filled with water of density $\rho$ ,and sealed with a flexible membrane.The container is placed in the space shuttle in orbit.If the air pressure in the shuttle is P_o,the pressure in the middle of the container is

Your blood pressure is reported as 50 mm of Hg.The density of mercury is 13.6 g/cm³.Your pressure is equivalent to

Using a motion sensor,Sean finds that the acceleration of a 2-kg rock that has been dropped from the roof of a building is 5.5 m/s².He concludes that the magnitude of force of air resistance acting on the rock is approximately

At what depth in sea water is the gauge pressure equal to 1 atm? The density of sea water is 1.03 $\times$ 10³ kg/m³.

A wind with speed 45 m/s blows across a roof 20 m long and 12 m wide.The pressure inside the room is 1 atm.What is the net force on this roof due to the pressure difference inside and outside the roof? (The density of air is equal to 1.3 kg/m³.)

A hurricane strength wind is blowing at a speed of 100 km/hr over a flat roof of 100 m².Assuming the inside of the house to be at 1 atm pressure and the density of air is 1.3 kg/m³,calculate the pressure difference between the inside and the outside of the roof.

A uniform cylinder of wood of length 25 cm is floating vertically upright in a dual layered fluid.An oil layer (of density 0.9 g/cm³)that is 9 cm deep lies above a depth of water.If only 5 cm of wood lies above the oil surface calculate the density of the wood.