Question 1

Estimate the volume of a helium-filled balloon at STP if it is to lift a payload of 450 kg.The density of air is 1.29 kg/m3 and helium has a density of 0.178 kg/m3.

Accepted Answer

A) 2 500 m3 
B) 310 m3 
C) 410 m3 
D) 350 m3 
E) 500 m3 
A) 2 500 m3 
B) 310 m3 
C) 410 m3 
D) 350 m3 
E) 500 m3

Question 2

John rapidly pulls a plunger out of a cylinder.As the plunger moves away,the gas molecules bouncing elastically off the plunger are

Accepted Answer

A) rebounding at a higher speed than they would have if the plunger weren't removed. 
B) rebounding at a lower speed than they would have if the plunger weren't removed. 
C) rebounding at the same speed as they would have if the plunger weren't removed. 
D) Whether they speed up or slow down depends on how fast the plunger is removed. 
A) rebounding at a higher speed than they would have if the plunger weren't removed. 
B) rebounding at a lower speed than they would have if the plunger weren't removed. 
C) rebounding at the same speed as they would have if the plunger weren't removed. 
D) Whether they speed up or slow down depends on how fast the plunger is removed.

Question 3

Evaporation cools the liquid that is left behind because the molecules that leave the liquid during evaporation

Accepted Answer

A) have kinetic energy. 
B) have greater than average speed. 
C) have broken the bonds that held them in the liquid. 
D) create vapor pressure. 
A) have kinetic energy. 
B) have greater than average speed. 
C) have broken the bonds that held them in the liquid. 
D) create vapor pressure.

Question 4

As a copper wire is heated,its length increases by 0.50%.What is the change of the temperature of the wire? (αCu = 16.6 × 10−6/C°)

Accepted Answer

A) 83.0°C 
B) 301°C 
C) 60.2°C 
D) 226°C 
E) 377°C 
A) 83.0°C 
B) 301°C 
C) 60.2°C 
D) 226°C 
E) 377°C

Question 5

A tank with a volume of 0.15 m3 contains 25.0°C helium gas at a pressure of 100 atm.How many balloons can be blown up if each filled balloon is a sphere 31.0 cm in diameter at 25.0°C and absolute pressure of 1.20 atm? Assume all the helium is transferred to the balloons.

Accepted Answer

A) 401 balloons 
B) 802 balloons 
C) 178 balloons 
D) 1 002 balloons 
E) ​126 balloons 
A) 401 balloons 
B) 802 balloons 
C) 178 balloons 
D) 1 002 balloons 
E) ​126 balloons

Question 6

Which law is for a quantity of gas held at constant volume?

Accepted Answer

A) Boyle's law 
B) Charles's law 
C) Gay-Lussac's law 
D) Avogadro's law 
A) Boyle's law 
B) Charles's law 
C) Gay-Lussac's law 
D) Avogadro's law

Question 7

If the temperature of a gas triples,by what factor does the speed of a molecule with the average kinetic energy change?

Accepted Answer

A) It increases by a factor of 3. 
B) It increases by a factor of   . 
C) It increases by a factor of 3   . 
D) It increases by a factor of 1/3. 
A) It increases by a factor of 3. 
B) It increases by a factor of   . 
C) It increases by a factor of 3   . 
D) It increases by a factor of 1/3.

Question 8

78°F is how many degrees Celsius?

Accepted Answer

A) 26 
B) 172 
C) 34 
D) 18 
E) 51 
A) 26 
B) 172 
C) 34 
D) 18 
E) 51

Question 9

A brass cube,15.0 cm on a side,is raised in temperature by 170°C.The coefficient of volume expansion of brass is 57 × 10−6/C°.By what percentage does volume increase?

Accepted Answer

A) 33% 
B) 1.4% 
C) 1.0% 
D) 3.4% 
E) 2.81% 
A) 33% 
B) 1.4% 
C) 1.0% 
D) 3.4% 
E) 2.81%

Question 10

Between 0° and 4°C,the volume coefficient of expansion for water

Accepted Answer

A) is positive. 
B) is zero. 
C) is becoming less dense. 
D) is negative. 
A) is positive. 
B) is zero. 
C) is becoming less dense. 
D) is negative.

Question 11

What thermodynamic quantity is held constant in Boyle's law?

Accepted Answer

A) pressure 
B) volume 
C) temperature 
D) Both pressure and volume are each held constant. 
A) pressure 
B) volume 
C) temperature 
D) Both pressure and volume are each held constant.

Question 12

What is the root-mean-square speed of chlorine gas molecules at a temperature of 346 K? (R = 8.31 J/mol⋅K,NA = 6.02 × 1023,and the molecular mass of Cl2 = 71)

Accepted Answer

A) 1.1E+2 m/s 
B) 3.5E+2 m/s 
C) 8.2E+4 m/s 
D) 1.2E+5 m/s 
E) 3.5E+4 m/s 
A) 1.1E+2 m/s 
B) 3.5E+2 m/s 
C) 8.2E+4 m/s 
D) 1.2E+5 m/s 
E) 3.5E+4 m/s

Question 13

Which best describes a system made up of ice,water and steam existing together?

Accepted Answer

A) absolute zero 
B) triple point 
C) ice point 
D) steam point 
A) absolute zero 
B) triple point 
C) ice point 
D) steam point

Question 14

Consider two containers with the same volume and temperature.Container One holds "dry" air--a mixture of nitrogen and oxygen.Container Two holds "moist" air.The "moist" air has the same ratio of nitrogen to oxygen molecules,but also contains water vapor.According to the ideal gas law,if the pressures are equal,the weight of the gas in Container One will be

Accepted Answer

A) lighter than the gas inside the second container. 
B) equal to the weight of the gas in the second container. 
C) heavier than the gas inside the second container. 
D) all the above are incorrect because the pressures cannot be equal. 
A) lighter than the gas inside the second container. 
B) equal to the weight of the gas in the second container. 
C) heavier than the gas inside the second container. 
D) all the above are incorrect because the pressures cannot be equal.

Question 15

Two moles of nitrogen gas are contained in an enclosed cylinder with a movable piston.If the molecular mass of nitrogen is 28.0,how many grams of nitrogen are present?

Accepted Answer

A) 0.140 
B) 56.0 
C) 42.0 
D) 112 
A) 0.140 
B) 56.0 
C) 42.0 
D) 112

Question 16

The observation that materials expand in size with an increase in temperature can be applied to what proportion of existing substances?

Accepted Answer

A) 100% 
B) most 
C) few 
D) none 
A) 100% 
B) most 
C) few 
D) none

Question 17

A steel wire,86.0 m long at 21°C,has a coefficient of linear expansion of 11 × 10−6/C°.Give its change in length as the temperature changes from 21°C to 36°C.

Accepted Answer

A) 2.0 cm 
B) 3.4 cm 
C) 1.4 cm 
D) 0.21 cm 
E) 6.3 cm 
A) 2.0 cm 
B) 3.4 cm 
C) 1.4 cm 
D) 0.21 cm 
E) 6.3 cm

Question 18

​The Rankine temperature scale has Fahrenheit degrees and a zero point at absolute zero.What is the Fahrenheit temperature of 62 Rankine?

Accepted Answer

A) ​-397.7 °F 
B) ​111.6 °F 
C) ​211.2 °F 
D) ​-238.7 °F 
A) ​-397.7 °F 
B) ​111.6 °F 
C) ​211.2 °F 
D) ​-238.7 °F

Question 19

What happens to a given volume of water when heated from 0°C to 4°C?

Accepted Answer

A) density increases 
B) density decreases 
C) density remains constant 
D) vaporizes 
A) density increases 
B) density decreases 
C) density remains constant 
D) vaporizes

Question 20

Arrange the temperatures 40 ºF,40 ºC,and 40 K from highest to lowest.

Accepted Answer

A) 40 ºF,40 ºC,40 K 
B) 40 ºC,40 K,40 ºF 
C) 40 ºF,40 K,40 ºC 
D) 40 ºC,40 ºF,40 K 
A) 40 ºF,40 ºC,40 K 
B) 40 ºC,40 K,40 ºF 
C) 40 ºF,40 K,40 ºC 
D) 40 ºC,40 ºF,40 K

Exam 10: Thermal Physics

Estimate the volume of a helium-filled balloon at STP if it is to lift a payload of 450 kg.The density of air is 1.29 kg/m3 and helium has a density of 0.178 kg/m3.

John rapidly pulls a plunger out of a cylinder.As the plunger moves away,the gas molecules bouncing elastically off the plunger are

Evaporation cools the liquid that is left behind because the molecules that leave the liquid during evaporation

As a copper wire is heated,its length increases by 0.50%.What is the change of the temperature of the wire? (αCu = 16.6 × 10−6/C°)

A tank with a volume of 0.15 m3 contains 25.0°C helium gas at a pressure of 100 atm.How many balloons can be blown up if each filled balloon is a sphere 31.0 cm in diameter at 25.0°C and absolute pressure of 1.20 atm? Assume all the helium is transferred to the balloons.

Which law is for a quantity of gas held at constant volume?

If the temperature of a gas triples,by what factor does the speed of a molecule with the average kinetic energy change?

78°F is how many degrees Celsius?

A brass cube,15.0 cm on a side,is raised in temperature by 170°C.The coefficient of volume expansion of brass is 57 × 10−6/C°.By what percentage does volume increase?

Between 0° and 4°C,the volume coefficient of expansion for water

What thermodynamic quantity is held constant in Boyle's law?

What is the root-mean-square speed of chlorine gas molecules at a temperature of 346 K? (R = 8.31 J/mol⋅K,NA = 6.02 × 1023,and the molecular mass of Cl2 = 71)

Which best describes a system made up of ice,water and steam existing together?

Two moles of nitrogen gas are contained in an enclosed cylinder with a movable piston.If the molecular mass of nitrogen is 28.0,how many grams of nitrogen are present?

The observation that materials expand in size with an increase in temperature can be applied to what proportion of existing substances?

A steel wire,86.0 m long at 21°C,has a coefficient of linear expansion of 11 × 10−6/C°.Give its change in length as the temperature changes from 21°C to 36°C.

​The Rankine temperature scale has Fahrenheit degrees and a zero point at absolute zero.What is the Fahrenheit temperature of 62 Rankine?

What happens to a given volume of water when heated from 0°C to 4°C?

Arrange the temperatures 40 ºF,40 ºC,and 40 K from highest to lowest.

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Energy in Thermal Processes

The Laws of Thermodynamics

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Induced Voltages and Inductance

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Filters

Estimate the volume of a helium-filled balloon at STP if it is to lift a payload of 450 kg.The density of air is 1.29 kg/m³ and helium has a density of 0.178 kg/m³.

As a copper wire is heated,its length increases by 0.50%.What is the change of the temperature of the wire? (α_Cu = 16.6 × 10−⁶/C°)

A tank with a volume of 0.15 m³ contains 25.0°C helium gas at a pressure of 100 atm.How many balloons can be blown up if each filled balloon is a sphere 31.0 cm in diameter at 25.0°C and absolute pressure of 1.20 atm? Assume all the helium is transferred to the balloons.

A brass cube,15.0 cm on a side,is raised in temperature by 170°C.The coefficient of volume expansion of brass is 57 × 10−⁶/C°.By what percentage does volume increase?

What is the root-mean-square speed of chlorine gas molecules at a temperature of 346 K? (R = 8.31 J/mol⋅K,N_A = 6.02 × 10²³,and the molecular mass of Cl₂ = 71)

A steel wire,86.0 m long at 21°C,has a coefficient of linear expansion of 11 × 10−⁶/C°.Give its change in length as the temperature changes from 21°C to 36°C.

The Rankine temperature scale has Fahrenheit degrees and a zero point at absolute zero.What is the Fahrenheit temperature of 62 Rankine?