Question 1

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 2

One end of a cylindrical pipe has a radius of 1.5 cm.Water (density = 1.0 * 103 kg/m3)streams steadily out at 7.0 m/s.The volume flow rate is:

Accepted Answer

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

Question 3

A block of ice at 0$\degree$C containing a piece of cork is floating on the surface of 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 4

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 5

The diagram shows a pipe of uniform cross section in which water is flowing.The directions of flow and the volume flow rates (in cm3/s)are shown for various portions of the pipe.The direction of flow and the volume flow rate in the portion marked A are:

Accepted Answer

A) "$\downarrow$ and 3 cm3/s" 
B) "$\uparrow$ and 7 cm3/s" 
C) "$\downarrow$ and 9 cm3/s" 
D) "$\uparrow$ and 11 cm3/s" 
E) "$\downarrow$ and 15 cm3/s" 
A) "$\downarrow$ and 3 cm3/s" 
B) "$\uparrow$ and 7 cm3/s" 
C) "$\downarrow$ and 9 cm3/s" 
D) "$\uparrow$ and 11 cm3/s" 
E) "$\downarrow$ and 15 cm3/s"

Question 6

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 7

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 8

The principle of fluid pressure which is used in hydraulic brakes or lifts is that:

Accepted Answer

A) pressure is the same at all levels in a fluid 
B) increases of pressure are transmitted equally to all parts of a fluid 
C) the pressure at a point in a fluid is due to the weight of the fluid above it 
D) increases of pressure can only be transmitted through fluids 
E) the pressure at a given depth is proportional to the depth in the fluid 
A) pressure is the same at all levels in a fluid 
B) increases of pressure are transmitted equally to all parts of a fluid 
C) the pressure at a point in a fluid is due to the weight of the fluid above it 
D) increases of pressure can only be transmitted through fluids 
E) the pressure at a given depth is proportional to the depth in the fluid

Question 9

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 10

A cork floats on the surface of an incompressible liquid in a container exposed to atmospheric pressure.The container is then sealed and the air above the liquid is evacuated.The cork:

Accepted Answer

A) sinks slightly 
B) rises slightly 
C) floats at the same height 
D) bobs up and down about its old position 
E) behaves erratically 
A) sinks slightly 
B) rises slightly 
C) floats at the same height 
D) bobs up and down about its old position 
E) behaves erratically

Question 11

Consider a pipe containing a fluid, with the fluid being at rest.To apply Bernoulli's equation to this situation:

Accepted Answer

A) set v equal to zero because there is no motion 
B) set g equal to zero because there is no acceleration 
C) set v and g both equal to zero 
D) set p equal to the atmospheric pressure 
E) cannot be done, Bernoulli's equation applies only to fluids in motion 
A) set v equal to zero because there is no motion 
B) set g equal to zero because there is no acceleration 
C) set v and g both equal to zero 
D) set p equal to the atmospheric pressure 
E) cannot be done, Bernoulli's equation applies only to fluids in motion

Question 12

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 13

A small steel ball floats in a half-full container of mercury.When water is added:

Accepted Answer

A) the ball will float on the water 
B) the ball will rise slightly 
C) the mercury will float on the water 
D) the ball will sink to the bottom of the container 
E) the ball will lower slightly more into the mercury 
A) the ball will float on the water 
B) the ball will rise slightly 
C) the mercury will float on the water 
D) the ball will sink to the bottom of the container 
E) the ball will lower slightly more into the mercury

Question 14

If p is a pressure and $\rho$s a mass density then p/$\rho$ has units of:

Accepted Answer

A) m2 
B) m2/s2 
C) N/m2 
D) kg/m2 
E) m3/kg 
A) m2 
B) m2/s2 
C) N/m2 
D) kg/m2 
E) m3/kg

Question 15

The density of water is 1.0 g/cm3.If h = 20 cm, the density of the oil in the left column of the U-tube shown below is:

Accepted Answer

A) 0.20 g/cm3 
B) 0.90 g/cm3 
C) 1.0 g/cm3 
D) 1.3 g/cm3 
E) 5.0 g/cm3 
A) 0.20 g/cm3 
B) 0.90 g/cm3 
C) 1.0 g/cm3 
D) 1.3 g/cm3 
E) 5.0 g/cm3

Question 16

A cork floats in water in a bucket resting on the floor of an elevator.The elevator then accelerates upward.During the acceleration:

Accepted Answer

A) the cork is immersed more 
B) the cork is immersed less 
C) the cork is immersed the same amount 
D) at first the cork is immersed less but as the elevator speeds up it is immersed more 
E) at first the cork is immersed more but as the elevator speeds up it is immersed less 
A) the cork is immersed more 
B) the cork is immersed less 
C) the cork is immersed the same amount 
D) at first the cork is immersed less but as the elevator speeds up it is immersed more 
E) at first the cork is immersed more but as the elevator speeds up it is immersed less

Question 17

Which of the following is true?

Accepted Answer

A) A streamline can only be defined for irrotational flow. 
B) A streamline cannot be defined for turbulent flow. 
C) Streamlines cannot cross in laminar flow, but can cross in turbulent flow. 
D) A streamline is the path that a tiny element of fluid would take as the fluid flows. 
E) The velocity vector of a fluid element is always perpendicular to the streamline. 
A) A streamline can only be defined for irrotational flow. 
B) A streamline cannot be defined for turbulent flow. 
C) Streamlines cannot cross in laminar flow, but can cross in turbulent flow. 
D) A streamline is the path that a tiny element of fluid would take as the fluid flows. 
E) The velocity vector of a fluid element is always perpendicular to the streamline.

Question 18

A person blows across the top of one arm of a U-tube partially filled with water.The water in that arm:

Accepted Answer

A) rises slightly 
B) drops slightly 
C) remains at the same height 
D) rises if the blowing is soft but drops if it is hard 
E) rises if the blowing is hard but drops if it is soft 
A) rises slightly 
B) drops slightly 
C) remains at the same height 
D) rises if the blowing is soft but drops if it is hard 
E) rises if the blowing is hard but drops if it is soft

Question 19

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 20

The units of pressure can also be written as:

Accepted Answer

A) N/m 
B) J∙m2 
C) W/m2 
D) J/m3 
E) N/m3 
A) N/m 
B) J∙m2 
C) W/m2 
D) J/m3 
E) N/m3

Exam 14: Fluids

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:

One end of a cylindrical pipe has a radius of 1.5 cm.Water (density = 1.0 * 103 kg/m3)streams steadily out at 7.0 m/s.The volume flow rate is:

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

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.

The diagram shows a pipe of uniform cross section in which water is flowing.The directions of flow and the volume flow rates (in cm3/s)are shown for various portions of the pipe.The direction of flow and the volume flow rate in the portion marked A are:

To obtain the absolute pressure from the gauge pressure:

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:

The principle of fluid pressure which is used in hydraulic brakes or lifts is that:

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:

A cork floats on the surface of an incompressible liquid in a container exposed to atmospheric pressure.The container is then sealed and the air above the liquid is evacuated.The cork:

Consider a pipe containing a fluid, with the fluid being at rest.To apply Bernoulli's equation to this situation:

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 small steel ball floats in a half-full container of mercury.When water is added:

If p is a pressure and ρ\rhoρ s a mass density then p/ ρ\rhoρ has units of:

The density of water is 1.0 g/cm3.If h = 20 cm, the density of the oil in the left column of the U-tube shown below is:

A cork floats in water in a bucket resting on the floor of an elevator.The elevator then accelerates upward.During the acceleration:

Which of the following is true?

A person blows across the top of one arm of a U-tube partially filled with water.The water in that arm:

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 units of pressure can also be written as:

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One end of a cylindrical pipe has a radius of 1.5 cm.Water (density = 1.0 * 10³ kg/m³)streams steadily out at 7.0 m/s.The volume flow rate is:

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

The diagram shows a pipe of uniform cross section in which water is flowing.The directions of flow and the volume flow rates (in cm³/s)are shown for various portions of the pipe.The direction of flow and the volume flow rate in the portion marked A are:

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:

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:

If p is a pressure and $\rho$ s a mass density then p/ $\rho$ has units of:

The density of water is 1.0 g/cm³.If h = 20 cm, the density of the oil in the left column of the U-tube shown below 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?