Question 1

An ideal fluid,of density 0.90 × 103 kg/m3,flows at 5.0 m/s through a level pipe with radius of 0.5 cm.The pressure in the fluid is 1.3 × 105 N/m2.This pipe connects to a second level pipe,with radius of 1.4 cm.Find the speed of flow in the second pipe.

Accepted Answer

A)  39.2 m/s 
B)  1.79 m/s 
C)  0.64 m/s 
D)  14 m/s 
E)  ​5.13 m/s

Question 2

Consider two steel rods,A and B.B has three times the area and twice the length of A,so Young's modulus for B will be what factor times Young's modulus for A?

Accepted Answer

A)  3.0 
B)  0.5 
C)  1.5 
D)  1.0

Question 3

Water is being sprayed from a nozzle at the end of a garden hose of diameter 2.0 cm.If the nozzle has an opening of diameter 1.0 cm,and if the water leaves the nozzle at a speed of 12 m/s,what is the speed of the water inside the hose?

Accepted Answer

A)  3 m/s 
B)  48 m/s 
C)  0.02 m/s 
D)  4 m/s 
E)  ​also 12 m/s

Question 4

It takes 2.5 minutes to fill a gas tank with 50 liters of gasoline.If the pump nozzle is 2.0 cm in radius,what is the average speed of the gasoline as it leaves the nozzle? (1 000 liters = one cubic meter)

Accepted Answer

A)  2.7 m/s 
B)  0.3 m/s 
C)  15.9 m/s 
D)  1.3 m/s 
E)  ​20 m/s

Question 5

A pipe carrying water has a radius of 1.0 cm.If the flow velocity is 9.0 cm/s,which of the following characterizes the flow? Take the viscosity of water to be 1.0 × 10−3 N⋅s/m.

Accepted Answer

A)  streamlined 
B)  unstable 
C)  turbulent 
D)  stagnant

Question 6

A fountain sends water to a height of 100 m.What must be the pressurization (above atmospheric)of the underground water system? (1 atm = 105 N/m2)

Accepted Answer

A)  1 atm 
B)  44.3 atm 
C)  10.8 atm 
D)  9.8 atm 
E)  ​0.1 atm

Question 7

In order to overcome a surface tension of a fluid,a force of 1.34 × 10−2 N is required to lift a wire ring of circumference 12.0 cm.What is the surface tension of the fluid?

Accepted Answer

A)  0.056 N/m 
B)  0.112 N/m 
C)  0.556 N/m 
D)  5.583 N/m 
E)  ​16.08 N/m

Question 8

When an artery gets a constricted region due to plaque,how does the pressure in this region compare to the pressure in an unconstricted region adjacent?

Accepted Answer

A)  Since this is a closed system,the pressure is the same in both regions. 
B)  In the constricted region the blood moves at a higher speed than in the unconstricted region resulting in an increased pressure. 
C)  In the constricted region the blood moves at a higher speed than in the unconstricted region resulting in a decreased pressure. 
D)  In the constricted region the blood moves at a lower speed than in the unconstricted region resulting in an increased pressure.

Question 9

An ice cube with a small solid steel sphere frozen inside floats in a glass of water filled to the brim.What happens to the level of water in the glass as a result of the ice melting?

Accepted Answer

A)  It goes up,overflowing. 
B)  It stays the same. 
C)  It goes down. 
D)  It depends on air pressure,thus the answer is indeterminate.

Question 10

What is the total mass of the Earth's atmosphere? (The radius of the Earth is 6.4 × 106 m,and atmospheric pressure at the surface is 105 N/m2. )

Accepted Answer

A)  5 × 1016 kg 
B)  1 × 1018 kg 
C)  5 × 1018 kg 
D)  1 × 1020 kg

Question 11

The flow rate of a liquid through a 4.0-cm-radius pipe is 0.0070 m3/s.The average fluid speed in the pipe is:

Accepted Answer

A)  0.04 m/s. 
B)  0.005 m/s. 
C)  0.14 m/s. 
D)  1.4 m/s. 
E)  ​14 m/s.

Question 12

The quantity "stress" expressed in terms of the fundamental quantities (mass,length,time)is equivalent to:

Accepted Answer

A)  MLT−1. 
B)  ML−1T−2. 
C)  M2L−1T−3. 
D)  a dimensionless quantity.

Question 13

A heavily loaded boat is floating in a pond.The boat starts to sink because of a leak but quick action plugging the leak stops the boat from going under although it is now deeper in the water.What happens to the surface level of the pond?

Accepted Answer

A)  It stays the same. 
B)  It goes up. 
C)  It goes down. 
D)  More information is needed to reach a conclusion.

Question 14

The bottom of a flat-bottomed aluminum boat has an area of 4.4 m2 and the boat's mass is 62 kg.When set afloat in water,how far below the water surface is the boat bottom? (water density = 1.0 × 103 kg/m3)

Accepted Answer

A)  14 m 
B)  0.014 m 
C)  0.114 m 
D)  0.273 m 
E)  ​0.024 m

Question 15

What volume of water is displaced by a submerged 2.5-kg cylinder made of solid aluminum? (aluminum density = 2.7 × 103 kg/m3 and water density = 1.0 × 103 kg/m3)

Accepted Answer

A)  9.3 × 10−4 m3 
B)  0.7 × 103 m3 
C)  0.9 × 103 m3 
D)  92.6 × 10−4 m3 
E)  ​8.3 × 103 m3

Question 16

Air pressure is 1.0 × 105 N/m2,air density is 1.3 kg/m3,and the density of soft drinks is 1.0 × 103 kg/m3.If one blows carefully across the top of a straw sticking up 0.130 m from the liquid in a soft drink can,it is possible to make the soft drink rise half way up the straw and stay there.How fast must the air be blown across the top of the straw?

Accepted Answer

A)  0.04 m/s 
B)  31 m/s 
C)  1.6 m/s 
D)  22 m/s​ 
E)  ​980 m/s

Question 17

A centrifuge rotates at 100 rev/s (i.e. ,628 rad/s).If the test tube places the suspension at 8.0 cm from the axis of rotation,by what factor are the terminal speeds of the settling particles increased as compared to sedimentation cause by gravity?

Accepted Answer

A)  3.2 × 103 
B)  321.9 
C)  31.6 
D)  5 × 105 
E)  ​4.2 × 103

Question 18

A tire stops a car by use of friction.What modulus should we use to calculate the stress and strain on the tire?

Accepted Answer

A)  Young's modulus 
B)  compression modulus 
C)  shear modulus 
D)  bulk modulus

Question 19

A copper wire of length 5.0 m,cross sectional area 7.5 × 10−6 m2 and Young's modulus 11 × 1010 N/m2 has a 190-kg load hung on it.What is its increase in length? (g = 9.8 m/s2)

Accepted Answer

A)  0.50 mm 
B)  11.7 mm 
C)  10.9 mm 
D)  11.3 mm 
E)  ​22.6 mm

Question 20

Bar One has a Young's modulus that is bigger than that of Bar Two.This indicates Bar One:

Accepted Answer

A)  is longer than Bar Two. 
B)  has a greater cross-sectional area than Bar Two. 
C)  has a greater elastic limit than Bar Two. 
D)  is made of material that is different from Bar Two.

Exam 9: Solids and Fluids

An ideal fluid,of density 0.90 × 10³ kg/m³,flows at 5.0 m/s through a level pipe with radius of 0.5 cm.The pressure in the fluid is 1.3 × 10⁵ N/m².This pipe connects to a second level pipe,with radius of 1.4 cm.Find the speed of flow in the second pipe.

Consider two steel rods,A and B.B has three times the area and twice the length of A,so Young's modulus for B will be what factor times Young's modulus for A?

Water is being sprayed from a nozzle at the end of a garden hose of diameter 2.0 cm.If the nozzle has an opening of diameter 1.0 cm,and if the water leaves the nozzle at a speed of 12 m/s,what is the speed of the water inside the hose?

It takes 2.5 minutes to fill a gas tank with 50 liters of gasoline.If the pump nozzle is 2.0 cm in radius,what is the average speed of the gasoline as it leaves the nozzle? (1 000 liters = one cubic meter)

A pipe carrying water has a radius of 1.0 cm.If the flow velocity is 9.0 cm/s,which of the following characterizes the flow? Take the viscosity of water to be 1.0 × 10−³ N⋅s/m.

A fountain sends water to a height of 100 m.What must be the pressurization (above atmospheric) of the underground water system? (1 atm = 10⁵ N/m²)

In order to overcome a surface tension of a fluid,a force of 1.34 × 10−² N is required to lift a wire ring of circumference 12.0 cm.What is the surface tension of the fluid?

When an artery gets a constricted region due to plaque,how does the pressure in this region compare to the pressure in an unconstricted region adjacent?

An ice cube with a small solid steel sphere frozen inside floats in a glass of water filled to the brim.What happens to the level of water in the glass as a result of the ice melting?

What is the total mass of the Earth's atmosphere? (The radius of the Earth is 6.4 × 10⁶ m,and atmospheric pressure at the surface is 10⁵ N/m². )

The flow rate of a liquid through a 4.0-cm-radius pipe is 0.0070 m³/s.The average fluid speed in the pipe is:

The quantity "stress" expressed in terms of the fundamental quantities (mass,length,time) is equivalent to:

A heavily loaded boat is floating in a pond.The boat starts to sink because of a leak but quick action plugging the leak stops the boat from going under although it is now deeper in the water.What happens to the surface level of the pond?

The bottom of a flat-bottomed aluminum boat has an area of 4.4 m² and the boat's mass is 62 kg.When set afloat in water,how far below the water surface is the boat bottom? (water density = 1.0 × 10³ kg/m³)

What volume of water is displaced by a submerged 2.5-kg cylinder made of solid aluminum? (aluminum density = 2.7 × 10³ kg/m³ and water density = 1.0 × 10³ kg/m³)

A centrifuge rotates at 100 rev/s (i.e. ,628 rad/s) .If the test tube places the suspension at 8.0 cm from the axis of rotation,by what factor are the terminal speeds of the settling particles increased as compared to sedimentation cause by gravity?

A tire stops a car by use of friction.What modulus should we use to calculate the stress and strain on the tire?

A copper wire of length 5.0 m,cross sectional area 7.5 × 10−⁶ m² and Young's modulus 11 × 10¹⁰ N/m² has a 190-kg load hung on it.What is its increase in length? (g = 9.8 m/s²)

Bar One has a Young's modulus that is bigger than that of Bar Two.This indicates Bar One:

Exam 9: Solids and Fluids

An ideal fluid,of density 0.90 × 103 kg/m3,flows at 5.0 m/s through a level pipe with radius of 0.5 cm.The pressure in the fluid is 1.3 × 105 N/m2.This pipe connects to a second level pipe,with radius of 1.4 cm.Find the speed of flow in the second pipe.

Consider two steel rods,A and B.B has three times the area and twice the length of A,so Young's modulus for B will be what factor times Young's modulus for A?

Water is being sprayed from a nozzle at the end of a garden hose of diameter 2.0 cm.If the nozzle has an opening of diameter 1.0 cm,and if the water leaves the nozzle at a speed of 12 m/s,what is the speed of the water inside the hose?

It takes 2.5 minutes to fill a gas tank with 50 liters of gasoline.If the pump nozzle is 2.0 cm in radius,what is the average speed of the gasoline as it leaves the nozzle? (1 000 liters = one cubic meter)

A pipe carrying water has a radius of 1.0 cm.If the flow velocity is 9.0 cm/s,which of the following characterizes the flow? Take the viscosity of water to be 1.0 × 10−3 N⋅s/m.

A fountain sends water to a height of 100 m.What must be the pressurization (above atmospheric) of the underground water system? (1 atm = 105 N/m2)

In order to overcome a surface tension of a fluid,a force of 1.34 × 10−2 N is required to lift a wire ring of circumference 12.0 cm.What is the surface tension of the fluid?

When an artery gets a constricted region due to plaque,how does the pressure in this region compare to the pressure in an unconstricted region adjacent?

An ice cube with a small solid steel sphere frozen inside floats in a glass of water filled to the brim.What happens to the level of water in the glass as a result of the ice melting?

What is the total mass of the Earth's atmosphere? (The radius of the Earth is 6.4 × 106 m,and atmospheric pressure at the surface is 105 N/m2. )

The flow rate of a liquid through a 4.0-cm-radius pipe is 0.0070 m3/s.The average fluid speed in the pipe is:

The quantity "stress" expressed in terms of the fundamental quantities (mass,length,time) is equivalent to:

A heavily loaded boat is floating in a pond.The boat starts to sink because of a leak but quick action plugging the leak stops the boat from going under although it is now deeper in the water.What happens to the surface level of the pond?

The bottom of a flat-bottomed aluminum boat has an area of 4.4 m2 and the boat's mass is 62 kg.When set afloat in water,how far below the water surface is the boat bottom? (water density = 1.0 × 103 kg/m3)

What volume of water is displaced by a submerged 2.5-kg cylinder made of solid aluminum? (aluminum density = 2.7 × 103 kg/m3 and water density = 1.0 × 103 kg/m3)

A centrifuge rotates at 100 rev/s (i.e. ,628 rad/s) .If the test tube places the suspension at 8.0 cm from the axis of rotation,by what factor are the terminal speeds of the settling particles increased as compared to sedimentation cause by gravity?

A tire stops a car by use of friction.What modulus should we use to calculate the stress and strain on the tire?

A copper wire of length 5.0 m,cross sectional area 7.5 × 10−6 m2 and Young's modulus 11 × 1010 N/m2 has a 190-kg load hung on it.What is its increase in length? (g = 9.8 m/s2)

Bar One has a Young's modulus that is bigger than that of Bar Two.This indicates Bar One:

An ideal fluid,of density 0.90 × 10³ kg/m³,flows at 5.0 m/s through a level pipe with radius of 0.5 cm.The pressure in the fluid is 1.3 × 10⁵ N/m².This pipe connects to a second level pipe,with radius of 1.4 cm.Find the speed of flow in the second pipe.

A pipe carrying water has a radius of 1.0 cm.If the flow velocity is 9.0 cm/s,which of the following characterizes the flow? Take the viscosity of water to be 1.0 × 10−³ N⋅s/m.

A fountain sends water to a height of 100 m.What must be the pressurization (above atmospheric) of the underground water system? (1 atm = 10⁵ N/m²)

In order to overcome a surface tension of a fluid,a force of 1.34 × 10−² N is required to lift a wire ring of circumference 12.0 cm.What is the surface tension of the fluid?

What is the total mass of the Earth's atmosphere? (The radius of the Earth is 6.4 × 10⁶ m,and atmospheric pressure at the surface is 10⁵ N/m². )

The flow rate of a liquid through a 4.0-cm-radius pipe is 0.0070 m³/s.The average fluid speed in the pipe is:

The bottom of a flat-bottomed aluminum boat has an area of 4.4 m² and the boat's mass is 62 kg.When set afloat in water,how far below the water surface is the boat bottom? (water density = 1.0 × 10³ kg/m³)

What volume of water is displaced by a submerged 2.5-kg cylinder made of solid aluminum? (aluminum density = 2.7 × 10³ kg/m³ and water density = 1.0 × 10³ kg/m³)

A copper wire of length 5.0 m,cross sectional area 7.5 × 10−⁶ m² and Young's modulus 11 × 10¹⁰ N/m² has a 190-kg load hung on it.What is its increase in length? (g = 9.8 m/s²)