Question 1

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 2

The two arms of a U-tube are not identical, one having twice the diameter of the other.A cork in the narrow arm requires a force of 16 N to remove it.The tube is filled with water and the wide arm is fitted with a piston.The minimum force that must be applied to the piston to push the cork out is:

Accepted Answer

A) 4 N 
B) 8 N 
C) 16 N 
D) 32 N 
E) 64 N 
A) 4 N 
B) 8 N 
C) 16 N 
D) 32 N 
E) 64 N

Question 3

A fluid of density 9.1 *102 kg/m3 is flowing through a tube at a speed of 5.3 m/s.What is the kinetic energy density of the fluid?

Accepted Answer

A) cannot be calculated without knowing the pressure 
B) cannot be calculated without knowing the elevation 
C) 4.8 * 103 J/m3 
D) 1.3 * 104 J/m3 
E) 2.5 *106 J/m3 
A) cannot be calculated without knowing the pressure 
B) cannot be calculated without knowing the elevation 
C) 4.8 * 103 J/m3 
D) 1.3 * 104 J/m3 
E) 2.5 *106 J/m3

Question 4

A non-viscous incompressible fluid is pumped steadily up a vertical pipe with uniform cross section.The difference in pressure between points at the top and bottom:

Accepted Answer

A) is the same as it would be if the fluid were motionless 
B) is greater at higher flow rates than at lower flow rates 
C) is less at higher flow rates than at lower flow rates 
D) does not depend on the density of the fluid 
E) is zero 
A) is the same as it would be if the fluid were motionless 
B) is greater at higher flow rates than at lower flow rates 
C) is less at higher flow rates than at lower flow rates 
D) does not depend on the density of the fluid 
E) is zero

Question 5

In a stationary homogeneous liquid:

Accepted Answer

A) pressure is the same at all points 
B) pressure depends on the direction 
C) pressure is independent of any atmospheric pressure on the upper surface of the liquid 
D) pressure is the same at all points at the same level 
E) none of the above 
A) pressure is the same at all points 
B) pressure depends on the direction 
C) pressure is independent of any atmospheric pressure on the upper surface of the liquid 
D) pressure is the same at all points at the same level 
E) none of the above

Question 6

A lawn sprinkler is made of a 1.0 cm diameter garden hose with one end closed and 25 holes, each with a diameter of 0.050 cm, cut near the closed end.If water flows at 2.0 m/s in the hose, the speed of the water leaving a hole is:

Accepted Answer

A) 2.0 m/s 
B) 32 m/s 
C) 40 m/s 
D) 600 m/s 
E) 800 m/s 
A) 2.0 m/s 
B) 32 m/s 
C) 40 m/s 
D) 600 m/s 
E) 800 m/s

Question 7

The dimensions of a wooden raft (density = 150 kg/m3)are 3.0 m * 3.0 m * 1.0 m.What maximum load can it carry in sea water (density =1020 kg/m3)?

Accepted Answer

A) 1350 kg 
B) 7800 kg 
C) 9200 kg 
D) 19,500 kg 
E) 24,300 kg 
A) 1350 kg 
B) 7800 kg 
C) 9200 kg 
D) 19,500 kg 
E) 24,300 kg

Question 8

A uniform U-tube is partially filled with water.Oil, of density 0.75 g/cm3, is poured into the right arm until the water level in the left arm rises 3 cm.The length of the oil column is then:

Accepted Answer

A) 2.25 cm 
B) 8 cm 
C) 6 cm 
D) 4 cm 
E) need to know the cross-sectional area of the U-tube 
A) 2.25 cm 
B) 8 cm 
C) 6 cm 
D) 4 cm 
E) need to know the cross-sectional area of the U-tube

Question 9

The vessels shown below all contain water to the same height.Rank them according to the pressure exerted by the water on the vessel bottoms, least to greatest.

Accepted Answer

A) 1, 2, 3, 4 
B) 3, 4, 2, 1 
C) 1, 2, 4, 3 
D) 2, 3, 4, 1 
E) All pressures are the same 
A) 1, 2, 3, 4 
B) 3, 4, 2, 1 
C) 1, 2, 4, 3 
D) 2, 3, 4, 1 
E) All pressures are the same

Question 10

A wood board floats in fresh water with 60% of its volume under water.The density of the wood is:

Accepted Answer

A) 0.4 g/cm3 
B) 0.5 g/cm3 
C) 0.6 g/cm3 
D) less than 0.4 g/cm3 
E) more than 0.6 g/cm3 
A) 0.4 g/cm3 
B) 0.5 g/cm3 
C) 0.6 g/cm3 
D) less than 0.4 g/cm3 
E) more than 0.6 g/cm3

Question 11

To measure moderately low pressures oil with a density of 8.5 * 102 kg/m3 is used in place of mercury in a barometer.A change in the oil column of 1.0 mm indicates a change in pressure of about:

Accepted Answer

A) 1.2 *10-7 Pa 
B) 1.2 *10-5 Pa 
C) 0.85 Pa 
D) 1.2 Pa 
E) 8.3 Pa 
A) 1.2 *10-7 Pa 
B) 1.2 *10-5 Pa 
C) 0.85 Pa 
D) 1.2 Pa 
E) 8.3 Pa

Question 12

An airtight box, having a lid of area 80.0 cm2, is partially evacuated.Atmospheric pressure is 1.01 * 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 * 104 Pa 
B) 2.60 *104 Pa 
C) 4.10 * 104 Pa 
D) 8.75 *104 Pa 
E) 1.36 *105 Pa 
A) 1.35 * 104 Pa 
B) 2.60 *104 Pa 
C) 4.10 * 104 Pa 
D) 8.75 *104 Pa 
E) 1.36 *105 Pa

Question 13

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 14

Which of the following five statements, concerning the upper surface pressure of a liquid, is FALSE?

Accepted Answer

A) it is independent of the surface area 
B) it is the same for all points on that surface 
C) it would not increase if the liquid depth were increased 
D) it would increase if the liquid density were increased 
E) it would increase if the atmospheric pressure increased 
A) it is independent of the surface area 
B) it is the same for all points on that surface 
C) it would not increase if the liquid depth were increased 
D) it would increase if the liquid density were increased 
E) it would increase if the atmospheric pressure increased

Question 15

The apparent weight of a steel sphere immersed in various liquids is measured using a spring scale.The greatest reading is obtained for that liquid:

Accepted Answer

A) having the smallest density 
B) having the largest density 
C) subject to the greatest atmospheric pressure 
D) having the greatest volume 
E) in which the sphere was submerged deepest 
A) having the smallest density 
B) having the largest density 
C) subject to the greatest atmospheric pressure 
D) having the greatest volume 
E) in which the sphere was submerged deepest

Question 16

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 17

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 18

1 Pa is:

Accepted Answer

A) 1 N/m 
B) 1 m/N 
C) 1 kg/m.s 
D) 1 kg/m.s2 
E) 1 N/m.s 
A) 1 N/m 
B) 1 m/N 
C) 1 kg/m.s 
D) 1 kg/m.s2 
E) 1 N/m.s

Question 19

Water flows from a 6.0-cm diameter pipe into an 8.0-cm diameter pipe.The speed in the 6.0-cm pipe is 5.0 m/s.The speed in the 8-inch pipe is:

Accepted Answer

A) 2.8 m/s 
B) 3.8 m/s 
C) 6.7 m/s 
D) 8.9 m/s 
E) 9.9 m/s 
A) 2.8 m/s 
B) 3.8 m/s 
C) 6.7 m/s 
D) 8.9 m/s 
E) 9.9 m/s

Question 20

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) 0.50 m3 
C) 0.90 m3 
D) 5.1 *10-2 m3 
E) 9.2 * 10-2 m3 
A) 0.14 m3 
B) 0.50 m3 
C) 0.90 m3 
D) 5.1 *10-2 m3 
E) 9.2 * 10-2 m3

Exam 14: Fluids

All fluids are:

The two arms of a U-tube are not identical, one having twice the diameter of the other.A cork in the narrow arm requires a force of 16 N to remove it.The tube is filled with water and the wide arm is fitted with a piston.The minimum force that must be applied to the piston to push the cork out is:

A fluid of density 9.1 *102 kg/m3 is flowing through a tube at a speed of 5.3 m/s.What is the kinetic energy density of the fluid?

A non-viscous incompressible fluid is pumped steadily up a vertical pipe with uniform cross section.The difference in pressure between points at the top and bottom:

In a stationary homogeneous liquid:

A lawn sprinkler is made of a 1.0 cm diameter garden hose with one end closed and 25 holes, each with a diameter of 0.050 cm, cut near the closed end.If water flows at 2.0 m/s in the hose, the speed of the water leaving a hole is:

The dimensions of a wooden raft (density = 150 kg/m3)are 3.0 m * 3.0 m * 1.0 m.What maximum load can it carry in sea water (density =1020 kg/m3)?

A uniform U-tube is partially filled with water.Oil, of density 0.75 g/cm3, is poured into the right arm until the water level in the left arm rises 3 cm.The length of the oil column is then:

The vessels shown below all contain water to the same height.Rank them according to the pressure exerted by the water on the vessel bottoms, least to greatest.

A wood board floats in fresh water with 60% of its volume under water.The density of the wood is:

To measure moderately low pressures oil with a density of 8.5 * 102 kg/m3 is used in place of mercury in a barometer.A change in the oil column of 1.0 mm indicates a change in pressure of about:

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

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?

Which of the following five statements, concerning the upper surface pressure of a liquid, is FALSE?

The apparent weight of a steel sphere immersed in various liquids is measured using a spring scale.The greatest reading is obtained for that liquid:

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:

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:

1 Pa is:

Water flows from a 6.0-cm diameter pipe into an 8.0-cm diameter pipe.The speed in the 6.0-cm pipe is 5.0 m/s.The speed in the 8-inch pipe 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:

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A fluid of density 9.1 *10² kg/m³ is flowing through a tube at a speed of 5.3 m/s.What is the kinetic energy density of the fluid?

The dimensions of a wooden raft (density = 150 kg/m³)are 3.0 m * 3.0 m * 1.0 m.What maximum load can it carry in sea water (density =1020 kg/m³)?

A uniform U-tube is partially filled with water.Oil, of density 0.75 g/cm³, is poured into the right arm until the water level in the left arm rises 3 cm.The length of the oil column is then:

To measure moderately low pressures oil with a density of 8.5 * 10² kg/m³ is used in place of mercury in a barometer.A change in the oil column of 1.0 mm indicates a change in pressure of about:

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

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: