Question 1

Express -40°C in °F.

Accepted Answer

A) -72°F 
B) -54°F 
C) -40°F 
D) 4.4°F 
A) -72°F 
B) -54°F 
C) -40°F 
D) 4.4°F

Question 2

Which two temperature changes are equivalent?

Accepted Answer

A) 1 K = 1 F° 
B) 1 F° = 1 C° 
C) 1 C° = 1 K 
D) none of the above 
A) 1 K = 1 F° 
B) 1 F° = 1 C° 
C) 1 C° = 1 K 
D) none of the above

Question 3

Oxygen molecules are 16 times more massive than hydrogen molecules.At a given temperature,how do their average molecular speeds compare? The oxygen molecules are moving

Accepted Answer

A) four times faster than the hydrogen molecules. 
B) at 1/4 the speed of the hydrogen molecules. 
C) sixteen times faster than the hydrogen molecules. 
D) at 1/16 the speed of the hydrogen molecules. 
E) at 1/ $\sqrt { 2 }$ the speed of the hydrogen molecules. 
A) four times faster than the hydrogen molecules. 
B) at 1/4 the speed of the hydrogen molecules. 
C) sixteen times faster than the hydrogen molecules. 
D) at 1/16 the speed of the hydrogen molecules. 
E) at 1/ $\sqrt { 2 }$ the speed of the hydrogen molecules.

Question 4

A refrigerator has an interior volume of 0.500 m3.The temperature inside the refrigerator in 282 K,and the pressure is 101 kPa.If the molecular weight of air is 29 g/mol,what is the mass of air inside the refrigerator? (R = 8.31 J/mol × K)

Accepted Answer

A) 625 g 
B) 513 g 
C) 447 g 
D) 329 g 
E) 243 g 
A) 625 g 
B) 513 g 
C) 447 g 
D) 329 g 
E) 243 g

Question 5

A hollow sphere of negligible mass and radius R is completely filled with a liquid so that its density is ρ.You now enlarge the sphere so its radius is 2R and completely fill it with the same liquid.What is the density of the enlarged sphere?

Accepted Answer

A) 8 ρ 
B) 4 ρ 
C) ρ/2 
D) ρ 
E) ρ/8 
A) 8 ρ 
B) 4 ρ 
C) ρ/2 
D) ρ 
E) ρ/8

Question 6

Dust particles in a grain elevator frequently have masses of the order of 1.0 × 10-9 kg.If,to a first approximation,we model the dust particles as an ideal gas,what would be the rms speed of such a particle in air at 27°C? The Boltzmann constant is 1.38 × 10-23 J/K .

Accepted Answer

A) 3.5 × 10-6 m/s 
B) 5.6 × 10-5 m/s 
C) 7.8 × 10-4 m/s 
D) 5.2 × 10-3 m/s 
E) 4.9 × 10-2 m/s 
A) 3.5 × 10-6 m/s 
B) 5.6 × 10-5 m/s 
C) 7.8 × 10-4 m/s 
D) 5.2 × 10-3 m/s 
E) 4.9 × 10-2 m/s

Question 7

A 3.9-L volume of ideal neon gas (monatomic)is at a pressure of 5.6 aym and a temperature of $330 \mathrm {~K} .$ The atomic mass of neon is $20.2 \mathrm {~g} / \mathrm { mol }$ The temperature of the gas is now increased to 430 K and the volume is increased to $5.9 \text { L. }$ What is the final pressure of the gas?

Accepted Answer

A) 4.8 atm 
B) 4.3 atm 
C) 5.3 atm 
D) 5.8 atm 
E) 6.3 atm 
A) 4.8 atm 
B) 4.3 atm 
C) 5.3 atm 
D) 5.8 atm 
E) 6.3 atm

Question 8

An ideal gas occupies 6.00 × 102 cm3 at 20°C.At what temperature will it occupy 1.20 × 103 cm3 if the pressure is held constant?

Accepted Answer

A) 10°C 
B) 40°C 
C) 100°C 
D) 313°C 
A) 10°C 
B) 40°C 
C) 100°C 
D) 313°C

Question 9

A 100-kg person sits on a 5-kg bicycle.The force that the person exerts on the bicycle is borne equally by the two wheels of the bicycle.The tires are 2.0 cm wide and are inflated to a gauge pressure of 8.0 × 105 Pa.What length of each tire is in contact with the ground?

Accepted Answer

A) 1.6 cm 
B) 1.8 cm 
C) 3.2 cm 
D) 2.4 cm 
E) 6.4 cm 
A) 1.6 cm 
B) 1.8 cm 
C) 3.2 cm 
D) 2.4 cm 
E) 6.4 cm

Question 10

Oxygen molecules are 16 times more massive than hydrogen molecules.At a given temperature,the average molecular kinetic energy of oxygen molecules,compared to that of hydrogen molecules,

Accepted Answer

A) is greater. 
B) is less. 
C) is the same. 
D) cannot be determined without knowing the pressure and volume. 
A) is greater. 
B) is less. 
C) is the same. 
D) cannot be determined without knowing the pressure and volume.

Question 11

Consider two equal-volume flasks of gas at the same temperature and pressure.One gas,oxygen,has a molecular mass of 32.The other gas,nitrogen,has a molecular mass of 28.What is the ratio of the number of oxygen molecules to the number of nitrogen molecules in these flasks?

Accepted Answer

A)  $\frac { 32 } { 38 }$ 
B)  $\frac { 28 } { 32 }$ 
C)  $\sqrt { \frac { 28 } { 32 } }$ 
D)  $\sqrt { \frac { 32 } { 28 } }$ 
E)  $\frac { 1 } { 1 }$ 
A)  $\frac { 32 } { 38 }$ 
B)  $\frac { 28 } { 32 }$ 
C)  $\sqrt { \frac { 28 } { 32 } }$ 
D)  $\sqrt { \frac { 32 } { 28 } }$ 
E)  $\frac { 1 } { 1 }$

Question 12

A 50.0-N brick has the following measures: 30.0 cm × 10.0 cm × 4.00 cm.What is the maximum pressure it can exert on a horizontal surface due to its interaction with Earth?

Accepted Answer

A) 1.25 Pa 
B) 12.5 Pa 
C) 1.25 kPa 
D) 12.5 kPa 
A) 1.25 Pa 
B) 12.5 Pa 
C) 1.25 kPa 
D) 12.5 kPa

Question 13

A quantity of an ideal gas is kept in a rigid container of constant volume.If the gas is originally at a temperature of 19°C,at what temperature will the pressure of the gas double from its original value?

Accepted Answer

A) 91°C 
B) 38°C 
C) 311°C 
D) 273°C 
E) 122°C 
A) 91°C 
B) 38°C 
C) 311°C 
D) 273°C 
E) 122°C

Question 14

Two containers of equal volume each hold samples of the same ideal gas.Container A has twice as many molecules as container B.If the gas pressure is the same in the two containers,the correct statement regarding the absolute temperatures TA and TB in containers A and B,respectively,is

Accepted Answer

A) TA = TB. 
B) TA = 2TB. 
C) TA = $\frac { 1 } { 2 }$ TB. 
D) TA = $\frac { 1 } { \sqrt { 2 } }$ TB. 
E) TA = $\frac { 1 } { 4 }$ TB. 
A) TA = TB. 
B) TA = 2TB. 
C) TA = $\frac { 1 } { 2 }$ TB. 
D) TA = $\frac { 1 } { \sqrt { 2 } }$ TB. 
E) TA = $\frac { 1 } { 4 }$ TB.

Question 15

A 1938 nickel has a diameter of 21.21 mm,a thickness of 1.95 mm,and weighs 0.04905 N.What is its density?

Accepted Answer

A) 1.37 × 10-4 kg/m3 
B) 1.82 × 103 kg/m3 
C) 19.3 × 103 kg/m3 
D) 3.63 × 103 kg/m3 
E) 7.26 × 103 kg/m3 
A) 1.37 × 10-4 kg/m3 
B) 1.82 × 103 kg/m3 
C) 19.3 × 103 kg/m3 
D) 3.63 × 103 kg/m3 
E) 7.26 × 103 kg/m3

Question 16

When a box rests on a round sheet of wood on the ground,it exerts an average pressure p on the wood.If the wood is replaced by a sheet that has half the diameter of the original piece,what is the new average pressure?

Accepted Answer

A) 4p 
B) 2p 
C) p $\sqrt { 2 }$ 
D) p/2 
E) p/4 
A) 4p 
B) 2p 
C) p $\sqrt { 2 }$ 
D) p/2 
E) p/4

Question 17

On a cold day,you take in 4.2 L of air into your lungs at a temperature of 0°C.If you hold your breath until the temperature of the air in your lungs reaches 37°C,what is the volume of the air in your lungs at that point,assuming the pressure does not change?

Accepted Answer

A) 4.2 L 
B) 4.4 L 
C) 4.6 L 
D) 4.8 L 
E) 5.0 L 
A) 4.2 L 
B) 4.4 L 
C) 4.6 L 
D) 4.8 L 
E) 5.0 L

Question 18

The root-mean-square speed of the molecules of an ideal gas is v.The gas is now slowly compressed to one-half its original volume with no change in temperature.What is the root-mean-square speed of the molecules now?

Accepted Answer

A) 4v 
B) 2v 
C) v/ $\sqrt { 2 }$ 
D) v 
E) v/2 
A) 4v 
B) 2v 
C) v/ $\sqrt { 2 }$ 
D) v 
E) v/2

Question 19

An ideal gas is held in a container of volume V at pressure p.The rms speed of a gas molecule under these conditions is v.If now the volume and pressure are changed to 2V and 2p,the rms speed of a molecule will be

Accepted Answer

A) v/2 
B) v 
C) 2v 
D) 4v 
E) v/4 
A) v/2 
B) v 
C) 2v 
D) 4v 
E) v/4

Question 20

A mole of diatomic oxygen molecules and a mole of diatomic nitrogen molecules are at STP.Which statements are true about these molecules? (There could be more than one correct choice.)

Accepted Answer

A) Both gases have the same average molecular speeds. 
B) Both gases have the same number of molecules. 
C) Both gases have the same average kinetic energy per molecule. 
D) Both gases have the same average momentum per molecule. 
A) Both gases have the same average molecular speeds. 
B) Both gases have the same number of molecules. 
C) Both gases have the same average kinetic energy per molecule. 
D) Both gases have the same average momentum per molecule.

Exam 10: Gases

Express -40°C in °F.

Which two temperature changes are equivalent?

Oxygen molecules are 16 times more massive than hydrogen molecules.At a given temperature,how do their average molecular speeds compare? The oxygen molecules are moving

A refrigerator has an interior volume of 0.500 m3.The temperature inside the refrigerator in 282 K,and the pressure is 101 kPa.If the molecular weight of air is 29 g/mol,what is the mass of air inside the refrigerator? (R = 8.31 J/mol × K)

A hollow sphere of negligible mass and radius R is completely filled with a liquid so that its density is ρ.You now enlarge the sphere so its radius is 2R and completely fill it with the same liquid.What is the density of the enlarged sphere?

Dust particles in a grain elevator frequently have masses of the order of 1.0 × 10-9 kg.If,to a first approximation,we model the dust particles as an ideal gas,what would be the rms speed of such a particle in air at 27°C? The Boltzmann constant is 1.38 × 10-23 J/K .

An ideal gas occupies 6.00 × 102 cm3 at 20°C.At what temperature will it occupy 1.20 × 103 cm3 if the pressure is held constant?

A 100-kg person sits on a 5-kg bicycle.The force that the person exerts on the bicycle is borne equally by the two wheels of the bicycle.The tires are 2.0 cm wide and are inflated to a gauge pressure of 8.0 × 105 Pa.What length of each tire is in contact with the ground?

Oxygen molecules are 16 times more massive than hydrogen molecules.At a given temperature,the average molecular kinetic energy of oxygen molecules,compared to that of hydrogen molecules,

Consider two equal-volume flasks of gas at the same temperature and pressure.One gas,oxygen,has a molecular mass of 32.The other gas,nitrogen,has a molecular mass of 28.What is the ratio of the number of oxygen molecules to the number of nitrogen molecules in these flasks?

A 50.0-N brick has the following measures: 30.0 cm × 10.0 cm × 4.00 cm.What is the maximum pressure it can exert on a horizontal surface due to its interaction with Earth?

A quantity of an ideal gas is kept in a rigid container of constant volume.If the gas is originally at a temperature of 19°C,at what temperature will the pressure of the gas double from its original value?

Two containers of equal volume each hold samples of the same ideal gas.Container A has twice as many molecules as container B.If the gas pressure is the same in the two containers,the correct statement regarding the absolute temperatures TA and TB in containers A and B,respectively,is

A 1938 nickel has a diameter of 21.21 mm,a thickness of 1.95 mm,and weighs 0.04905 N.What is its density?

When a box rests on a round sheet of wood on the ground,it exerts an average pressure p on the wood.If the wood is replaced by a sheet that has half the diameter of the original piece,what is the new average pressure?

On a cold day,you take in 4.2 L of air into your lungs at a temperature of 0°C.If you hold your breath until the temperature of the air in your lungs reaches 37°C,what is the volume of the air in your lungs at that point,assuming the pressure does not change?

The root-mean-square speed of the molecules of an ideal gas is v.The gas is now slowly compressed to one-half its original volume with no change in temperature.What is the root-mean-square speed of the molecules now?

An ideal gas is held in a container of volume V at pressure p.The rms speed of a gas molecule under these conditions is v.If now the volume and pressure are changed to 2V and 2p,the rms speed of a molecule will be

A mole of diatomic oxygen molecules and a mole of diatomic nitrogen molecules are at STP.Which statements are true about these molecules? (There could be more than one correct choice.)

Introduction

Kinematics: Motion in One Dimension

Newtonian Mechanics

Applying Newtons Laws

Circular Motion

Impulse and Linear Momentum

Work and Energy

Extended Bodies at Rest

Rotational Motion

Static Fluids

Fluids in Motion

First Law of Thermodynamics

Second Law of Thermodynamics

Electric Charge force and Energy

The Electric Field

Dc Circuits

Magnetism

Electromagnetic Induction

Vibrational Motion

Mechanical Waves

Reflection and Refraction

Mirrors and Lenses

Wave Optics

Electromagnetic Waves

Special Relativity

Quantum Optics

Atomic Physics

Nuclear Physics

Particle Physics

Filters

A refrigerator has an interior volume of 0.500 m³.The temperature inside the refrigerator in 282 K,and the pressure is 101 kPa.If the molecular weight of air is 29 g/mol,what is the mass of air inside the refrigerator? (R = 8.31 J/mol × K)

Dust particles in a grain elevator frequently have masses of the order of 1.0 × 10^-9 kg.If,to a first approximation,we model the dust particles as an ideal gas,what would be the rms speed of such a particle in air at 27°C? The Boltzmann constant is 1.38 × 10^-23 J/K .

An ideal gas occupies 6.00 × 10² cm³ at 20°C.At what temperature will it occupy 1.20 × 10³ cm³ if the pressure is held constant?

A 100-kg person sits on a 5-kg bicycle.The force that the person exerts on the bicycle is borne equally by the two wheels of the bicycle.The tires are 2.0 cm wide and are inflated to a gauge pressure of 8.0 × 10⁵ Pa.What length of each tire is in contact with the ground?

Two containers of equal volume each hold samples of the same ideal gas.Container A has twice as many molecules as container B.If the gas pressure is the same in the two containers,the correct statement regarding the absolute temperatures T_A and T_B in containers A and B,respectively,is