Question 1

Water comes down the spillway of a dam from an initial vertical height of 100 m.What is the highest possible speed of the water at the end of the spillway?

Accepted Answer

A)  15 m/s 
B)  44 m/s 
C)  58 m/s 
D)  1370 m/s 
A)  15 m/s 
B)  44 m/s 
C)  58 m/s 
D)  1370 m/s B

Question 2

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 0.080 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)  76 m/s 
B)  27 m/s 
C)  25 m/s 
D)  0.99 m/s 
A)  76 m/s 
B)  27 m/s 
C)  25 m/s 
D)  0.99 m/s C

Question 3

A hole is poked through the metal side of a drum holding water.The hole is 28 cm below the water surface.What is the initial speed of outflow?

Accepted Answer

A)  1.9 m/s 
B)  2.3 m/s 
C)  3.2 m/s 
D)  3.5 m/s 
A)  1.9 m/s 
B)  2.3 m/s 
C)  3.2 m/s 
D)  3.5 m/s B

Question 4

An ideal fluid,of density 0.85 × 103 kg/m3,flows at 0.50 kg/s through a pipe of radius 0.010 m.What is the fluid speed?

Accepted Answer

A)  0.95 m/s 
B)  1.9 m/s 
C)  3.0 m/s 
D)  0.94 m/s 
A)  0.95 m/s 
B)  1.9 m/s 
C)  3.0 m/s 
D)  0.94 m/s

Question 5

An ideal fluid,of density 0.90 × 103 kg/m3,flows at 12 m/s through a level pipe with radius of 0.50 cm.The pressure in the fluid is 1.3 × 105 N/m2.This pipe connects to a second level pipe with a radius of 1.5 cm.Find the speed of flow in the second pipe.

Accepted Answer

A)  54 m/s 
B)  1.3 m/s 
C)  0.67 m/s 
D)  0.33 m/s 
A)  54 m/s 
B)  1.3 m/s 
C)  0.67 m/s 
D)  0.33 m/s

Question 6

How deep under the surface of a lake would the pressure be triple that at the surface? (1 atm = 1.01 × 105 Pa)

Accepted Answer

A)  1.00 m 
B)  9.80 m 
C)  10.3 m 
D)  20.6 m 
A)  1.00 m 
B)  9.80 m 
C)  10.3 m 
D)  20.6 m

Question 7

The flow rate of blood through the average human aorta,of radius 0.95 cm,is about 90 cm3/s.What is the speed of the blood flow through the aorta?

Accepted Answer

A)  14 cm/s 
B)  32 cm/s 
C)  37 cm/s 
D)  29 cm/s 
A)  14 cm/s 
B)  32 cm/s 
C)  37 cm/s 
D)  29 cm/s

Question 8

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 0.50 cm,and if the water leaves the nozzle at a speed of 15 m/s,what is the speed of the water inside the hose?

Accepted Answer

A)  0.63 m/s 
B)  0.94 m/s 
C)  2.5 m/s 
D)  also 10 m/s 
A)  0.63 m/s 
B)  0.94 m/s 
C)  2.5 m/s 
D)  also 10 m/s

Question 9

Water is sent from a fire hose at 40 m/s at an angle of 30° above the horizontal.What is the maximum height reached by the water?

Accepted Answer

A)  7.5 m 
B)  11 m 
C)  15 m 
D)  20 m 
A)  7.5 m 
B)  11 m 
C)  15 m 
D)  20 m

Question 10

The bottom of a flat-bottomed aluminum boat has area = 4.0 m2 and mass = 120 kg.If two fishermen and their fishing gear with total mass of 240 kg are placed in the boat,how much lower will the boat ride in the water? (water density = 1.0 × 103 kg/m3)

Accepted Answer

A)  0.15 m 
B)  0.090 m 
C)  0.075 m 
D)  0.060 m 
A)  0.15 m 
B)  0.090 m 
C)  0.075 m 
D)  0.060 m

Question 11

Legend says that Archimedes,in determining whether or not the king's crown was made of pure gold,measured its volume by the water displacement method.If the density of gold is 19.3 g/cm3,and the crown's mass is 440 g,what volume would be necessary to prove that it is pure gold?

Accepted Answer

A)  31.1 cm3 
B)  114 × 103 cm3 
C)  22.8 cm3 
D)  1.81 × 10−2 cm3 
A)  31.1 cm3 
B)  114 × 103 cm3 
C)  22.8 cm3 
D)  1.81 × 10−2 cm3

Question 12

A Boeing-737 airliner has a mass of 30,000 kg.The total area of the wings is 100 m2.What must be the pressure difference between the top and bottom of the wings to keep the airplane up?

Accepted Answer

A)  1960 Pa 
B)  2940 Pa 
C)  7840 Pa 
D)  15,700 Pa 
A)  1960 Pa 
B)  2940 Pa 
C)  7840 Pa 
D)  15,700 Pa

Question 13

A piece of aluminum has density 2.70 g/cm3 and mass 834g.The aluminum is submerged in a container of oil of density 0.650 g/cm3.A spring balance is attached with string to the piece of aluminum.What reading will the balance register in grams (g)for the submerged metal?

Accepted Answer

A)  960 g 
B)  633 g 
C)  588 g 
D)  190 g 
A)  960 g 
B)  633 g 
C)  588 g 
D)  190 g

Question 14

What volume of water is displaced by a submerged 16-kg cylinder made of solid aluminum? (aluminum density = 2.7 × 103 kg/m3 and water density = 1.0 × 103 kg/m3)

Accepted Answer

A)  7.4 × l0−4 m3 
B)  1.5 × 10−3 m3 
C)  9.9 × 103 m3 
D)  5.9 × 10−3 m3 
A)  7.4 × l0−4 m3 
B)  1.5 × 10−3 m3 
C)  9.9 × 103 m3 
D)  5.9 × 10−3 m3

Question 15

A jet of water flowing from a hose at 15 m/s is directed against a wall.If the mass flow in the fluid stream is 4.3 kg/s,what force is the water applying to the wall if backsplash is negligible?

Accepted Answer

A)  30 N 
B)  40 N 
C)  65 N 
D)  127 N 
A)  30 N 
B)  40 N 
C)  65 N 
D)  127 N

Question 16

A U-tube is partially filled with water and then an immiscible liquid is added to the right side.The top of the liquid is a distance h1 above the level of interface between the liquid and water.On the left side of the tube the top of the water is a distance h2 above the liquid-water interface on the right side.What is the density of the liquid in terms of the density of water  
? Note that h2 1.

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
A) 
  
B) 
  
C) 
  
D)

Question 17

It takes 2.0 minutes to fill a gas tank with 60 liters of gasoline.If the pump nozzle is 1.0 cm in radius,what is the average speed of the gasoline as it leaves the nozzle? (1000 liters = one cubic meter)

Accepted Answer

A)  0.27 m/s 
B)  1.1 m/s 
C)  1.6 m/s 
D)  64 m/s 
A)  0.27 m/s 
B)  1.1 m/s 
C)  1.6 m/s 
D)  64 m/s

Question 18

A solid object is made of two materials,one material having density of 2000 kg/m3 and the other having density of 6000 kg/m3.If the object contains equal masses of the materials,what is its average density?

Accepted Answer

A)  3000 kg/m3 
B)  3200 kg/m3 
C)  5000 kg/m3 
D)  more information is needed 
A)  3000 kg/m3 
B)  3200 kg/m3 
C)  5000 kg/m3 
D)  more information is needed

Question 19

A syringe has an inside radius of its barrel of 0.50 cm and at the opening at the end of the needle the radius is 1.0 mm.If a force F is applied to the plunger,what is the force produced at the opening of the needle?

Accepted Answer

A)  5F 
B)  25F 
C)  F/5 
D)  F/25 
A)  5F 
B)  25F 
C)  F/5 
D)  F/25

Question 20

The flow rate of a liquid through a 2.0-cm radius pipe is 0.016 m3/s.The average fluid speed in the pipe is:

Accepted Answer

A)  0.64 m/s. 
B)  13 m/s. 
C)  0.040 m/s. 
D)  6.4 m/s. 
A)  0.64 m/s. 
B)  13 m/s. 
C)  0.040 m/s. 
D)  6.4 m/s.

Exam 10: Thermal Physics: Part A

Water comes down the spillway of a dam from an initial vertical height of 100 m.What is the highest possible speed of the water at the end of the spillway?

A hole is poked through the metal side of a drum holding water.The hole is 28 cm below the water surface.What is the initial speed of outflow?

An ideal fluid,of density 0.85 × 103 kg/m3,flows at 0.50 kg/s through a pipe of radius 0.010 m.What is the fluid speed?

An ideal fluid,of density 0.90 × 103 kg/m3,flows at 12 m/s through a level pipe with radius of 0.50 cm.The pressure in the fluid is 1.3 × 105 N/m2.This pipe connects to a second level pipe with a radius of 1.5 cm.Find the speed of flow in the second pipe.

How deep under the surface of a lake would the pressure be triple that at the surface? (1 atm = 1.01 × 105 Pa)

The flow rate of blood through the average human aorta,of radius 0.95 cm,is about 90 cm3/s.What is the speed of the blood flow through the aorta?

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 0.50 cm,and if the water leaves the nozzle at a speed of 15 m/s,what is the speed of the water inside the hose?

Water is sent from a fire hose at 40 m/s at an angle of 30° above the horizontal.What is the maximum height reached by the water?

The bottom of a flat-bottomed aluminum boat has area = 4.0 m2 and mass = 120 kg.If two fishermen and their fishing gear with total mass of 240 kg are placed in the boat,how much lower will the boat ride in the water? (water density = 1.0 × 103 kg/m3)

Legend says that Archimedes,in determining whether or not the king's crown was made of pure gold,measured its volume by the water displacement method.If the density of gold is 19.3 g/cm3,and the crown's mass is 440 g,what volume would be necessary to prove that it is pure gold?

A Boeing-737 airliner has a mass of 30,000 kg.The total area of the wings is 100 m2.What must be the pressure difference between the top and bottom of the wings to keep the airplane up?

A piece of aluminum has density 2.70 g/cm3 and mass 834g.The aluminum is submerged in a container of oil of density 0.650 g/cm3.A spring balance is attached with string to the piece of aluminum.What reading will the balance register in grams (g)for the submerged metal?

What volume of water is displaced by a submerged 16-kg cylinder made of solid aluminum? (aluminum density = 2.7 × 103 kg/m3 and water density = 1.0 × 103 kg/m3)

A jet of water flowing from a hose at 15 m/s is directed against a wall.If the mass flow in the fluid stream is 4.3 kg/s,what force is the water applying to the wall if backsplash is negligible?

It takes 2.0 minutes to fill a gas tank with 60 liters of gasoline.If the pump nozzle is 1.0 cm in radius,what is the average speed of the gasoline as it leaves the nozzle? (1000 liters = one cubic meter)

A solid object is made of two materials,one material having density of 2000 kg/m3 and the other having density of 6000 kg/m3.If the object contains equal masses of the materials,what is its average density?

A syringe has an inside radius of its barrel of 0.50 cm and at the opening at the end of the needle the radius is 1.0 mm.If a force F is applied to the plunger,what is the force produced at the opening of the needle?

The flow rate of a liquid through a 2.0-cm radius pipe is 0.016 m3/s.The average fluid speed in the pipe is:

Introduction

Introduction: Part A

Motion in One Dimension

Motion in One Dimension: Part A

Vectors and Two-Dimensional Motion

Vectors and Two-Dimensional Motion: Part A

The Laws of Motion

The Laws of Motion: Part A

Energy

Energy: Part A

Momentum and Collisions

Momentum and Collisions: Part A

Rotational Motion and the Law of Gravity

Rotational Motion and the Law of Gravity: Part A

Rotational Equilibrium and Rotational Dynamics

Rotational Equilibrium and Rotational Dynamics: Part A

Solids and Fluids

Solids and Fluids: Part A

Thermal Physics

Energy in Thermal Processes Heat and Internal Energy

Energy in Thermal Processes Heat and Internal Energy: Part A

The Laws of Thermodynamics Work in Thermodynamic Processes

The Laws of Thermodynamics Work in Thermodynamic Processes: Part A

Vibrations and Waves

Vibrations and Waves: Part A

Sound

Sound: Part A

Electric Forces and Electric Fields

Electric Forces and Electric Fields: Part A

Electrical Energy and Capacitance

Electrical Energy and Capacitance: Part A

Current and Resistance Electric Current

Current and Resistance Electric Current: Part A

Direct-Current Circuits Sources of EMF

Direct-Current Circuits Sources of EMF: Part A

Magnetism Magnets

Magnetism Magnets: Part A

Induced Voltages and Inductance

Induced Voltages and Inductance: Part A

Alternating-Current Circuits and Electromagnetic Waves

Alternating-Current Circuits and Electromagnetic Waves: Part A

Reflection and Refraction of Light

Reflection and Refraction of Light: Part A

Mirrors and Lenses

Mirrors and Lenses: Part A

Wave Optics

Wave Optics: Part A

Optical Instruments

Optical Instruments: Part A

Relativity

Relativity: Part A

Quantum Physics Blackbody Radiation and Plancks Hypothesis

Quantum Physics Blackbody Radiation and Plancks Hypothesis: Part A

Atomic Physics

Atomic Physics: Part A

Nuclear Physics

Nuclear Physics: Part A

Nuclear Energy and Elementary Particles

Nuclear Energy and Elementary Particles: Part A

Particle Collisions, Mediating Photons, and Quark Structures: Exploring the Fundamentals of Physics

Filters

An ideal fluid,of density 0.85 × 10³ kg/m³,flows at 0.50 kg/s through a pipe of radius 0.010 m.What is the fluid speed?

An ideal fluid,of density 0.90 × 10³ kg/m³,flows at 12 m/s through a level pipe with radius of 0.50 cm.The pressure in the fluid is 1.3 × 10⁵ N/m².This pipe connects to a second level pipe with a radius of 1.5 cm.Find the speed of flow in the second pipe.

How deep under the surface of a lake would the pressure be triple that at the surface? (1 atm = 1.01 × 10⁵ Pa)

The flow rate of blood through the average human aorta,of radius 0.95 cm,is about 90 cm³/s.What is the speed of the blood flow through the aorta?

The bottom of a flat-bottomed aluminum boat has area = 4.0 m² and mass = 120 kg.If two fishermen and their fishing gear with total mass of 240 kg are placed in the boat,how much lower will the boat ride in the water? (water density = 1.0 × 10³ kg/m³)

Legend says that Archimedes,in determining whether or not the king's crown was made of pure gold,measured its volume by the water displacement method.If the density of gold is 19.3 g/cm³,and the crown's mass is 440 g,what volume would be necessary to prove that it is pure gold?

A Boeing-737 airliner has a mass of 30,000 kg.The total area of the wings is 100 m².What must be the pressure difference between the top and bottom of the wings to keep the airplane up?

A piece of aluminum has density 2.70 g/cm³ and mass 834g.The aluminum is submerged in a container of oil of density 0.650 g/cm³.A spring balance is attached with string to the piece of aluminum.What reading will the balance register in grams (g)for the submerged metal?

What volume of water is displaced by a submerged 16-kg cylinder made of solid aluminum? (aluminum density = 2.7 × 10³ kg/m³ and water density = 1.0 × 10³ kg/m³)

A solid object is made of two materials,one material having density of 2000 kg/m³ and the other having density of 6000 kg/m³.If the object contains equal masses of the materials,what is its average density?

The flow rate of a liquid through a 2.0-cm radius pipe is 0.016 m³/s.The average fluid speed in the pipe is: