Question 1

When you blow some air above the upper face of a paper strip,the paper rises.This occurs because

Accepted Answer

A) the air above the upper face of the paper moves faster,which makes the pressure higher than at the lower face. 
B) the air above the upper face of the paper moves faster,which makes the pressure lower than at the lower face. 
C) the air above the upper face of the paper moves faster but the pressure remains constant. 
D) the air above the upper face of the paper moves slower,which makes the pressure higher than at the lower face. 
E) the air above the upper face of the paper moves slower,which makes the pressure lower than at the lower face. 
A) the air above the upper face of the paper moves faster,which makes the pressure higher than at the lower face. 
B) the air above the upper face of the paper moves faster,which makes the pressure lower than at the lower face. 
C) the air above the upper face of the paper moves faster but the pressure remains constant. 
D) the air above the upper face of the paper moves slower,which makes the pressure higher than at the lower face. 
E) the air above the upper face of the paper moves slower,which makes the pressure lower than at the lower face.

Question 2

A 50-cm3 block of wood is floating partially submerged in water,and a 50-cm3 block of iron is totally submerged in water.Which block has the greater buoyant force on it?

Accepted Answer

A) the wood 
B) the iron 
C) Both have the same buoyant force. 
D) The answer cannot be determined without knowing the densities of the blocks. 
A) the wood 
B) the iron 
C) Both have the same buoyant force. 
D) The answer cannot be determined without knowing the densities of the blocks.

Question 3

On planet X,the absolute pressure at a depth of 2.00 m below the surface of a liquid nitrogen lake is 5.00 × 105 N/m2.At a depth 5.00 m below the surface,the absolute pressure is
8.00 × 105 N/m2.The density of liquid nitrogen is 808 kg/m3.
(a)What is the atmospheric pressure on planet X?
(b)What is the acceleration due to gravity on planet X?

Accepted Answer

(a)3.00 ×

Question 4

A circular cylinder of height 1.20 m having faces of diameter 0.620 m is immersed in water of density 1.00 × 103 kg/m3 with its axis vertical so that its faces are parallel to the surface of the water.The upper face is 2.50 m below the surface of the water.The net force on this cylinder is observed to be 1120 N downward.Atmospheric pressure is 1.01 × 105 Pa.What net force does the water exert on the lower face of the cylinder?

Accepted Answer

A) 7.40 × 103 N 
B) 1.09 × 104 N 
C) 3.79 × 104 N 
D) 4.14 × 104 N 
E) 1.37 × 105 N 
A) 7.40 × 103 N 
B) 1.09 × 104 N 
C) 3.79 × 104 N 
D) 4.14 × 104 N 
E) 1.37 × 105 N

Question 5

A very light 1.00-m wire consists of two segments of equal length,one of steel (Young's modulus is 2.00 × 1011 N/m2)and one of brass (Young's modulus is 9.0 × 1010 N/m2).The steel segment is 1.50 mm in diameter,and the brass segment has twice this diameter.When a weight w is hung from the ceiling by this wire,the steel segment stretches by 1.10 mm.By what distance does the brass segment stretch?

Accepted Answer

A) 0.50 mm 
B) 0.61 mm 
C) 1.2 mm 
D) 2.4 mm 
E) 9.8 mm 
A) 0.50 mm 
B) 0.61 mm 
C) 1.2 mm 
D) 2.4 mm 
E) 9.8 mm

Question 6

The weight of a car of mass 1.20 × 103 kg is supported equally by the four tires,which are inflated to the same gauge pressure.What gauge pressure in the tires is required so the area of contact of each tire with the road is 1.00 × 102 cm2? (1 atm = 1.01 × 105 Pa.)

Accepted Answer

A) 11.6 × 105 Pa 
B) 11.6 × 104 Pa 
C) 2.94 × 105 Pa 
D) 2.94 × 104 Pa 
E) 2.94 × 103 Pa 
A) 11.6 × 105 Pa 
B) 11.6 × 104 Pa 
C) 2.94 × 105 Pa 
D) 2.94 × 104 Pa 
E) 2.94 × 103 Pa

Question 7

At a certain depth in the ocean,the absolute pressure is p.If you go to twice that depth (treating the water as incompressible)

Accepted Answer

A) the absolute pressure will be 2p. 
B) the absolute pressure will be less than 2p. 
C) the absolute pressure will be greater than 2p. 
D) the gauge pressure will not change. 
E) the gauge pressure will increase but will not double. 
A) the absolute pressure will be 2p. 
B) the absolute pressure will be less than 2p. 
C) the absolute pressure will be greater than 2p. 
D) the gauge pressure will not change. 
E) the gauge pressure will increase but will not double.

Question 8

The tensile strength (the maximum tensile stress it can support without breaking)for a certain steel wire is 3000 MN/m2.What is the maximum load that can be applied to a wire with a diameter of 3.0 mm made of this steel without breaking the wire?

Accepted Answer

A) 64 kN 
B) 9.0 kN 
C) 42 kN 
D) 85 kN 
E) 21 kN 
A) 64 kN 
B) 9.0 kN 
C) 42 kN 
D) 85 kN 
E) 21 kN

Question 9

As shown in the figure,a container has a vertical tube,whose inner radius is 32.00 mm,connected to it at its side.An unknown liquid reaches level A in the container and level B in the tube-level A being 5.0 cm higher than level B.The liquid supports a 20.0-cm high column of oil,between levels B and C,whose density is 460 kg/m3.What is the density of the unknown liquid?

Accepted Answer

A) 1800 kg/m3 
B) 2000 kg/m3 
C) 1400 kg/m3 
D) 1600 kg/m3 
E) 1700 kg/m3 
A) 1800 kg/m3 
B) 2000 kg/m3 
C) 1400 kg/m3 
D) 1600 kg/m3 
E) 1700 kg/m3

Question 10

A horizontal tube consists of a   pipe that narrows to a 2.0-cm-diameter throat.In the pipe,the water pressure is twice atmospheric pressure and the water flows with a speed of   What is the pressure in the throat,assuming that the water behaves like an ideal fluid? The density of water is 1000 kg/m3,and atmospheric pressure is 1.01 × 105 Pa.

Accepted Answer

A) 1.9 atm 
B) 0.12 atm 
C) 2.1 atm 
D) 2.0 atm 
A) 1.9 atm 
B) 0.12 atm 
C) 2.1 atm 
D) 2.0 atm

Question 11

A steel lift column in a service station is a solid cylinder 4.0 m long and 0.20 m in diameter.Young's modulus for this steel is 20 × 1010 N/m2.By what distance does the column compress when a 5000-kg truck is on it?

Accepted Answer

A) 4.7 × 10-7 m 
B) 8.0 × 10-7 m 
C) 3.2 × 10-6 m 
D) 7.8 × 10-6 m 
E) 3.1 × 10-5 m 
A) 4.7 × 10-7 m 
B) 8.0 × 10-7 m 
C) 3.2 × 10-6 m 
D) 7.8 × 10-6 m 
E) 3.1 × 10-5 m

Question 12

A solid steel sphere with a radius of 2.0 m falls off a ship and sinks to a depth where the pressure is 15 MN/m2.The bulk modulus for this steel is 1.6 × 1011 N/m2.What is the change in the radius of the sphere?

Accepted Answer

A) -0.021 mm 
B) -4.2 mm 
C) -0.42 mm 
D) -0.19 mm 
E) -0.062 mm 
A) -0.021 mm 
B) -4.2 mm 
C) -0.42 mm 
D) -0.19 mm 
E) -0.062 mm

Exam 14: Fluids and Elasticity

When you blow some air above the upper face of a paper strip,the paper rises.This occurs because

A 50-cm3 block of wood is floating partially submerged in water,and a 50-cm3 block of iron is totally submerged in water.Which block has the greater buoyant force on it?

The weight of a car of mass 1.20 × 103 kg is supported equally by the four tires,which are inflated to the same gauge pressure.What gauge pressure in the tires is required so the area of contact of each tire with the road is 1.00 × 102 cm2? (1 atm = 1.01 × 105 Pa.)

At a certain depth in the ocean,the absolute pressure is p.If you go to twice that depth (treating the water as incompressible)

The tensile strength (the maximum tensile stress it can support without breaking)for a certain steel wire is 3000 MN/m2.What is the maximum load that can be applied to a wire with a diameter of 3.0 mm made of this steel without breaking the wire?

A steel lift column in a service station is a solid cylinder 4.0 m long and 0.20 m in diameter.Young's modulus for this steel is 20 × 1010 N/m2.By what distance does the column compress when a 5000-kg truck is on it?

A solid steel sphere with a radius of 2.0 m falls off a ship and sinks to a depth where the pressure is 15 MN/m2.The bulk modulus for this steel is 1.6 × 1011 N/m2.What is the change in the radius of the sphere?

Concepts of Motion

Kinematics in One Dimension

Vectors and Coordinate Systems

Kinematics in Two Dimensions

Force and Motion

Dynamics I: Motion Along a Line

Newtons Third Law

Dynamics II: Motion in a Plane

Work and Kinetic Energy

Interactions and Potential Energy

Impulse and Momentum

Rotation of a Rigid Body

Newtons Theory of Gravity

Oscillations

Traveling Waves

Superposition

A Macroscopic Description of Matter

Work, heat, and the First Law of Thermodynamics

The Micromacro Connection

Heat Engines and Refrigerators

Electric Charges and Forces

The Electric Field

Gausss Law

The Electric Potential

Potential and Field

Current and Resistance

Fundamentals of Circuits

The Magnetic Field

Electromagnetic Induction

Electromagnetic Fields and Waves

Ac Circuits

Wave Optics

Ray Optics

Optical Instruments

Relativity

The Foundations of Modern Physics

Quantization

Wave Functions and Uncertainty

One-Dimensional Quantum Mechanics

Atomic Physics

Nuclear Physics

Filters

A 50-cm³ block of wood is floating partially submerged in water,and a 50-cm³ block of iron is totally submerged in water.Which block has the greater buoyant force on it?

The weight of a car of mass 1.20 × 10³ kg is supported equally by the four tires,which are inflated to the same gauge pressure.What gauge pressure in the tires is required so the area of contact of each tire with the road is 1.00 × 10² cm²? (1 atm = 1.01 × 10⁵ Pa.)

The tensile strength (the maximum tensile stress it can support without breaking)for a certain steel wire is 3000 MN/m².What is the maximum load that can be applied to a wire with a diameter of 3.0 mm made of this steel without breaking the wire?

A steel lift column in a service station is a solid cylinder 4.0 m long and 0.20 m in diameter.Young's modulus for this steel is 20 × 10¹⁰ N/m².By what distance does the column compress when a 5000-kg truck is on it?

A solid steel sphere with a radius of 2.0 m falls off a ship and sinks to a depth where the pressure is 15 MN/m².The bulk modulus for this steel is 1.6 × 10¹¹N/m².What is the change in the radius of the sphere?