Question 1

A fountain sends a stream of water 20.0 m up into the air.If the base of the stream is 10.0 cm in diameter,what power is required to send the water to this height?

Accepted Answer

The answer of A fountain sends a stream of water...

Question 2

A boat is floating in a small pond.The boat then sinks so that it is completely submerged.What happens to the level of the pond?

Accepted Answer

A) It increases. 
B) It decreases. 
C) It stays the same. 
D) In some cases it would decrease,in others it would stay the same. 
E) In some cases it would increase,in others it would stay the same. 
A) It increases. 
B) It decreases. 
C) It stays the same. 
D) In some cases it would decrease,in others it would stay the same. 
E) In some cases it would increase,in others it would stay the same.

Question 3

A cube of water ice (ρ = 0.917 × 103 kg/m3)is placed in mercury (ρ = 13.6 × 103 kg/m3),which is liquid at 0° Celsius.If we ignore any possible melting of the ice cube and problems with the surface tension of mercury,the fraction of the ice cube that floats above the surface of the mercury is

Accepted Answer

A) 0.067 4. 
B) 0.073 5. 
C) 0.926. 
D) 0.933. 
E) 1.00. 
A) 0.067 4. 
B) 0.073 5. 
C) 0.926. 
D) 0.933. 
E) 1.00.

Question 4

Water is flowing at 4.0 m/s in a circular pipe.If the diameter of the pipe decreases to 1/2 its former value,what is the velocity of the water downstream?

Accepted Answer

A) 1.0 m/s 
B) 2.0 m/s 
C) 8.0 m/s 
D) 16 m/s 
E) 4.0 m/s 
A) 1.0 m/s 
B) 2.0 m/s 
C) 8.0 m/s 
D) 16 m/s 
E) 4.0 m/s

Question 5

Some species of whales can dive to depths of one kilometer.What is the total pressure they experience at this depth? (ρsea = 1 020 kg/m3 and 1.01 × 105 N/m2 = 1 ATM. )

Accepted Answer

A) 9.00 ATM 
B) 90.0 ATM 
C) 100 ATM 
D) 111 ATM 
E) 130 ATM 
A) 9.00 ATM 
B) 90.0 ATM 
C) 100 ATM 
D) 111 ATM 
E) 130 ATM

Question 6

How much power is theoretically available from a mass flow of 1 000 kg/s of water when it falls a vertical distance of 100 meters?

Accepted Answer

A) 980 kW 
B) 98 kW 
C) 4 900 W 
D) 980 W 
E) 9 600 W 
A) 980 kW 
B) 98 kW 
C) 4 900 W 
D) 980 W 
E) 9 600 W

Question 7

To the nearest percent,what fraction of an iceberg is submerged? (ρice = 917 kg/m3,ρsea = 1.03 × 103 kg/m3. )

Accepted Answer

A) 95% 
B) 93% 
C) 91% 
D) 89% 
E) 77% 
A) 95% 
B) 93% 
C) 91% 
D) 89% 
E) 77%

Question 8

In a wind tunnel the pressure on the top surface of a model airplane wing is 8.8 × 104 N/m and the pressure on the bottom surface is 9.0 × 104 N/m2.If the area of the top and bottom surfaces of each wing is 2.0 m2,what is the total lift on the model airplane?

Accepted Answer

A) 2.0 × 103 N 
B) 8.0 × 103 N 
C) 1.6 × 104 N 
D) 3.6 × 104 N 
E) 1.0 × 103 N 
A) 2.0 × 103 N 
B) 8.0 × 103 N 
C) 1.6 × 104 N 
D) 3.6 × 104 N 
E) 1.0 × 103 N

Question 9

Exhibit 14-1
A dictator has built a bunker for his use in emergencies.Its dimensions are shown below.When it floods to ground level during a tropical storm,air is trapped above the dashed line in the bunker.   Use this exhibit to answer the following question(s).
-Refer to Exhibit 14-1.The absolute pressure at point A,in Pa,is

Accepted Answer

A) 3.92 × 105. 
B) 4.90 × 105. 
C) 5.39 × 105. 
D) 5.88 × 105. 
E) 6.89 × 105. 
A) 3.92 × 105. 
B) 4.90 × 105. 
C) 5.39 × 105. 
D) 5.88 × 105. 
E) 6.89 × 105.

Question 10

What is the net force inward acting on a spherical bathysphere of diameter 2.00 m at an ocean depth of 1 000 m? (The pressure inside the bathysphere is,hopefully,1 ATM. )ρ(sea water) = 1.02 × 103 kg/m3.

Accepted Answer

A) 1.26 × 104 N 
B) 1.26 × 106 N 
C) 1.26 × 108 N 
D) 1.26 × 1010 N 
E) 1.26 × 102 N 
A) 1.26 × 104 N 
B) 1.26 × 106 N 
C) 1.26 × 108 N 
D) 1.26 × 1010 N 
E) 1.26 × 102 N

Question 11

Determine the minimum area of a flat ice floe 1.0 meter thick if it is to support a 2 000-kg car above seawater.(ρice = 920 kg/m3,ρsea = 1 020 kg/m3. )

Accepted Answer

A) 20 m2 
B) 40 m2 
C) 60 m2 
D) 80 m2 
E) 100 m2 
A) 20 m2 
B) 40 m2 
C) 60 m2 
D) 80 m2 
E) 100 m2

Question 12

A police crime lab is trying to determine whether someone was murdered or died as a result of an accident.He was struck in the temple by a 4.20 kg sculpture that is alleged to have fallen off a bookcase.The sculpture presumably fell a distance of 1.43 m and the corner that struck him had an area of 0.250 cm2.If the time for the sculpture to stop was 1.00 ms,the pressure on his temple,in N/m2,was

Accepted Answer

A) 8.89 × 104. 
B) 1.65 × 105. 
C) 1.65 × 106. 
D) 8.89 × 108. 
E) 1.65 × 109. 
A) 8.89 × 104. 
B) 1.65 × 105. 
C) 1.65 × 106. 
D) 8.89 × 108. 
E) 1.65 × 109.

Question 13

Water is sent from a firehose at 30.0 m/s at an angle of 30.0° above the horizontal.What is the maximum height reached by the water?

Accepted Answer

A) 7.50 m 
B) 11.5 m 
C) 15.0 m 
D) 19.0 m 
E) 30.0 m 
A) 7.50 m 
B) 11.5 m 
C) 15.0 m 
D) 19.0 m 
E) 30.0 m

Exam 14: Fluid Mechanics

A fountain sends a stream of water 20.0 m up into the air.If the base of the stream is 10.0 cm in diameter,what power is required to send the water to this height?

A boat is floating in a small pond.The boat then sinks so that it is completely submerged.What happens to the level of the pond?

A cube of water ice (ρ = 0.917 × 103 kg/m3)is placed in mercury (ρ = 13.6 × 103 kg/m3),which is liquid at 0° Celsius.If we ignore any possible melting of the ice cube and problems with the surface tension of mercury,the fraction of the ice cube that floats above the surface of the mercury is

Water is flowing at 4.0 m/s in a circular pipe.If the diameter of the pipe decreases to 1/2 its former value,what is the velocity of the water downstream?

Some species of whales can dive to depths of one kilometer.What is the total pressure they experience at this depth? (ρsea = 1 020 kg/m3 and 1.01 × 105 N/m2 = 1 ATM. )

How much power is theoretically available from a mass flow of 1 000 kg/s of water when it falls a vertical distance of 100 meters?

To the nearest percent,what fraction of an iceberg is submerged? (ρice = 917 kg/m3,ρsea = 1.03 × 103 kg/m3. )

In a wind tunnel the pressure on the top surface of a model airplane wing is 8.8 × 104 N/m and the pressure on the bottom surface is 9.0 × 104 N/m2.If the area of the top and bottom surfaces of each wing is 2.0 m2,what is the total lift on the model airplane?

What is the net force inward acting on a spherical bathysphere of diameter 2.00 m at an ocean depth of 1 000 m? (The pressure inside the bathysphere is,hopefully,1 ATM. )ρ(sea water) = 1.02 × 103 kg/m3.

Determine the minimum area of a flat ice floe 1.0 meter thick if it is to support a 2 000-kg car above seawater.(ρice = 920 kg/m3,ρsea = 1 020 kg/m3. )

Water is sent from a firehose at 30.0 m/s at an angle of 30.0° above the horizontal.What is the maximum height reached by the water?

Physics and Measurement

Motion in One Dimension

Vectors

Motion in Two Dimensions

The Laws of Motion

Circular Motion and Other Applications of Newtons Laws

Energy of a System

Conservation of Energy

Linear Momentum and Collisions

Rotation of a Rigid Object About a Fixed Axis

Angular Momentum

Static Equilibrium and Elasticity

Universal Gravitation

Oscillatory Motion

Wave Motion

Sound Waves

Superposition and Standing Waves

Temperature

The First Law of Thermodynamics

The Kinetic Theory of Gases

Heat Engines, entropy, and the Second Law of Thermodynamics

Electric Fields

Gausss Law

Electric Potential

Capacitance and Dielectrics

Current and Resistance

Direct-Current Circuits

Magnetic Fields

Sources of the Magnetic Field

Faradays Law

Inductance

Alternating-Current Circuits

Electromagnetic Waves

The Nature of Light and the Principles of Ray Optics

Image Formation

Wave Optics

Diffraction Patterns and Polarization

Relativity

Introduction to Quantum Physics

Quantum Mechanics

Atomic Physics

Molecules and Solids

Nuclear Structure

Applications of Nuclear Physics

Particle Physics and Cosmology

Filters

Some species of whales can dive to depths of one kilometer.What is the total pressure they experience at this depth? (ρ_sea = 1 020 kg/m³ and 1.01 × 10⁵ N/m² = 1 ATM. )

To the nearest percent,what fraction of an iceberg is submerged? (ρ_ice = 917 kg/m³,ρ_sea = 1.03 × 10³ kg/m³. )

In a wind tunnel the pressure on the top surface of a model airplane wing is 8.8 × 10⁴ N/m and the pressure on the bottom surface is 9.0 × 10⁴ N/m².If the area of the top and bottom surfaces of each wing is 2.0 m²,what is the total lift on the model airplane?

What is the net force inward acting on a spherical bathysphere of diameter 2.00 m at an ocean depth of 1 000 m? (The pressure inside the bathysphere is,hopefully,1 ATM. )ρ_{(sea water)} = 1.02 × 10³ kg/m³.

Determine the minimum area of a flat ice floe 1.0 meter thick if it is to support a 2 000-kg car above seawater.(ρ_ice = 920 kg/m³,ρ_sea = 1 020 kg/m³. )