Question 1

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 2

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 3

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 4

One end of a cylindrical pipe has a radius of 1.5 cm.Water (density = 1.0 x103 kg/m3)streams steadily out at 7.0 m/s.The volume flow rate is:

Accepted Answer

A) 4.9x 10-3 m3/s 
B) 2.5 m3/s 
C) 4.9 m3/s 
D) 7.0 m3/s 
E) 48 m3/s 
A) 4.9x 10-3 m3/s 
B) 2.5 m3/s 
C) 4.9 m3/s 
D) 7.0 m3/s 
E) 48 m3/s

Question 5

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 6

To measure moderately low pressures oil with a density of 8.5 x 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 x 10-7 Pa 
B) 1.2 x10-5 Pa 
C) 0.85 Pa 
D) 1.2 Pa 
E) 8.3 Pa 
A) 1.2 x 10-7 Pa 
B) 1.2 x10-5 Pa 
C) 0.85 Pa 
D) 1.2 Pa 
E) 8.3 Pa

Question 7

A fluid of density 9.1 x 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 x103 J/m3 
D) 1.3 x 104 J/m3 
E) 2.5 x106 J/m3 
A) cannot be calculated without knowing the pressure 
B) cannot be calculated without knowing the elevation 
C) 4.8 x103 J/m3 
D) 1.3 x 104 J/m3 
E) 2.5 x106 J/m3

Question 8

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 9

Water flows through a cylindrical pipe of varying cross-section.The velocity is 3.0 m/s at a point where the pipe diameter is 1.0 cm.At a point where the pipe diameter is 3.0 cm, the velocity is:

Accepted Answer

A) 9 m/s 
B) 3 m/s 
C) 1 m/s 
D) 0.33 m/s 
E) 0.11 m/s 
A) 9 m/s 
B) 3 m/s 
C) 1 m/s 
D) 0.33 m/s 
E) 0.11 m/s

Question 10

A bucket resting on the floor of an elevator contains an incompressible fluid of density    .When the elevator has a downward acceleration of magnitude 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 11

A non-viscous incompressible liquid is flowing through a horizontal pipe of constant cross-section.Bernoulli's equation and the equation of continuity predict that the drop in pressure along the pipe:

Accepted Answer

A) is zero 
B) depends on the length of the pipe 
C) depends on the fluid velocity 
D) depends on the cross-sectional area of the pipe 
E) depends on the height of the pipe 
A) is zero 
B) depends on the length of the pipe 
C) depends on the fluid velocity 
D) depends on the cross-sectional area of the pipe 
E) depends on the height of the pipe

Question 12

To obtain the absolute pressure from the gauge pressure:

Accepted Answer

A) subtract atmospheric pressure 
B) add atmospheric pressure 
C) subtract 273 
D) add 273 
E) convert to N/m2 
A) subtract atmospheric pressure 
B) add atmospheric pressure 
C) subtract 273 
D) add 273 
E) convert to N/m2

Question 13

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 x10-2 m3 
E) 9.2 x10-2 m3 
A) 0.14 m3 
B) 0.50 m3 
C) 0.90 m3 
D) 5.1 x10-2 m3 
E) 9.2 x10-2 m3

Question 14

The diagram shows a U-tube having cross-sectional area A and partially filled with oil of density    .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   g 
B) L3   g 
C) A   (L + h)g 
D) A   (L - h)g 
E) none of these 
A) AL   g 
B) L3   g 
C) A   (L + h)g 
D) A   (L - h)g 
E) none of these

Question 15

"An object completely submerged in a fluid displaces its own volume of fluid." This is:

Accepted Answer

A) Pascal's paradox 
B) Archimedes' principle 
C) Pascal's principle 
D) true, but none of the above 
E) false 
A) Pascal's paradox 
B) Archimedes' principle 
C) Pascal's principle 
D) true, but none of the above 
E) false

Question 16

A 0.50 N metal sinker appears (as measured using a spring scale)to have a mass of 0.45 N when submerged in water.The specific gravity of the metal is:

Accepted Answer

A) 6 
B) 8 
C) 9 
D) 10 
E) 12 
A) 6 
B) 8 
C) 9 
D) 10 
E) 12

Question 17

An object hangs from a spring balance.The balance indicates 30 N in air, 20 N when the object is submerged in water.Which of the following is true?

Accepted Answer

A) The actual weight of the object is 20 N. 
B) The actual weight of the object is 10 N. 
C) The actual weight of the object is slightly more than 30 N, due to the buoyant force of the air. 
D) The actual weight of the object is slightly less than 30 N, due to the buoyant force of the air. 
E) The actual weight of the object is equal to the apparent weight of the object in both cases. 
A) The actual weight of the object is 20 N. 
B) The actual weight of the object is 10 N. 
C) The actual weight of the object is slightly more than 30 N, due to the buoyant force of the air. 
D) The actual weight of the object is slightly less than 30 N, due to the buoyant force of the air. 
E) The actual weight of the object is equal to the apparent weight of the object in both cases.

Question 18

A bucket of water is pushed from left to right with increasing speed across a horizontal surface.Consider the pressure at two points at the same level in the water.

Accepted Answer

A) It is the same 
B) It is higher at the point on the left 
C) It is higher at the point on the right 
D) At first it is higher at the point on the left but as the bucket speeds up it is lower there 
E) At first it is higher at the point on the right but as the bucket speeds up it is lower there 
A) It is the same 
B) It is higher at the point on the left 
C) It is higher at the point on the right 
D) At first it is higher at the point on the left but as the bucket speeds up it is lower there 
E) At first it is higher at the point on the right but as the bucket speeds up it is lower there

Question 19

One piston in a hydraulic lift has an area that is twice the area of the other.When the pressure at the smaller piston is increased by$\Delta$p the pressure at the larger piston:

Accepted Answer

A) increases by 2$\Delta$p 
B) increases by $\Delta$p/2 
C) increases by $\Delta$p 
D) increases by 4$\Delta$p 
E) does not change 
A) increases by 2$\Delta$p 
B) increases by $\Delta$p/2 
C) increases by $\Delta$p 
D) increases by 4$\Delta$p 
E) does not change

Question 20

A fluid is undergoing "incompressible" flow.This means that:

Accepted Answer

A) the pressure at a given point cannot change with time 
B) the velocity at a given point cannot change with time 
C) the velocity must be the same everywhere 
D) the pressure must be the same everywhere 
E) the density cannot change with time or location 
A) the pressure at a given point cannot change with time 
B) the velocity at a given point cannot change with time 
C) the velocity must be the same everywhere 
D) the pressure must be the same everywhere 
E) the density cannot change with time or location

Exam 14: Fluids

In a stationary homogeneous liquid:

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:

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?

One end of a cylindrical pipe has a radius of 1.5 cm.Water (density = 1.0 x103 kg/m3)streams steadily out at 7.0 m/s.The volume flow rate is:

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

To measure moderately low pressures oil with a density of 8.5 x 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:

A fluid of density 9.1 x 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?

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:

Water flows through a cylindrical pipe of varying cross-section.The velocity is 3.0 m/s at a point where the pipe diameter is 1.0 cm.At a point where the pipe diameter is 3.0 cm, the velocity is:

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

A non-viscous incompressible liquid is flowing through a horizontal pipe of constant cross-section.Bernoulli's equation and the equation of continuity predict that the drop in pressure along the pipe:

To obtain the absolute pressure from the gauge pressure:

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:

The diagram shows a U-tube having cross-sectional area A and partially filled with oil of density .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:

"An object completely submerged in a fluid displaces its own volume of fluid." This is:

A 0.50 N metal sinker appears (as measured using a spring scale)to have a mass of 0.45 N when submerged in water.The specific gravity of the metal is:

An object hangs from a spring balance.The balance indicates 30 N in air, 20 N when the object is submerged in water.Which of the following is true?

A bucket of water is pushed from left to right with increasing speed across a horizontal surface.Consider the pressure at two points at the same level in the water.

One piston in a hydraulic lift has an area that is twice the area of the other.When the pressure at the smaller piston is increased by Δ\DeltaΔ p the pressure at the larger piston:

A fluid is undergoing "incompressible" flow.This means that:

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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?

One end of a cylindrical pipe has a radius of 1.5 cm.Water (density = 1.0 x10³ kg/m³)streams steadily out at 7.0 m/s.The volume flow rate is:

To measure moderately low pressures oil with a density of 8.5 x 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:

A fluid of density 9.1 x 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 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:

One piston in a hydraulic lift has an area that is twice the area of the other.When the pressure at the smaller piston is increased by $\Delta$ p the pressure at the larger piston: