Question 1

If you double the thickness of a wall built from a homogeneous material, the rate of heat loss for a given temperature difference across the thickness will

Accepted Answer

A)  become one-half its original value. 
B)  double. 
C)  become one-fourth its original value. 
D)  quadruple. 
E)  become one-eighth its original value. 
A)  become one-half its original value. 
B)  double. 
C)  become one-fourth its original value. 
D)  quadruple. 
E)  become one-eighth its original value.

Question 2

A thermally isolated system is made up of a hot piece of aluminum and a cold piece of copper; the aluminum and the copper are in thermal contact. The specific heat capacity of aluminum is more than double that of copper. Which object experiences the greater temperature change during the time the system takes to reach thermal equilibrium?

Accepted Answer

A)  the copper 
B)  the aluminum 
C)  neither; both experience the same size temperature change 
D)  it is impossible to tell without knowing the masses 
E)  it is impossible to tell without knowing the volumes 
A)  the copper 
B)  the aluminum 
C)  neither; both experience the same size temperature change 
D)  it is impossible to tell without knowing the masses 
E)  it is impossible to tell without knowing the volumes

Question 3

A 400-g piece of metal at 100°C is dropped into a 100-g aluminum cup containing 500 g of water at 15°C. The final temperature of the system is 40°C. What is the specific heat of the metal, assuming no heat is exchanged with the surroundings? The specific heat of aluminum is 900 J/(kg∙K)

Accepted Answer

A)  1900 J/(kg∙K) 
B)  2270 J/(kg∙K) 
C)  3300 J/(kg∙K) 
D)  3800 J/(kg∙K) 
E)  4280 J/(kg∙K) 
A)  1900 J/(kg∙K) 
B)  2270 J/(kg∙K) 
C)  3300 J/(kg∙K) 
D)  3800 J/(kg∙K) 
E)  4280 J/(kg∙K)

Question 4

Nitrogen boils at -196°C. What is the corresponding temperature in the Fahrenheit scale?

Accepted Answer

A)  -315°F 
B)  -196°F 
C)  -346°F 
D)  -290°F 
E)  -321°F 
A)  -315°F 
B)  -196°F 
C)  -346°F 
D)  -290°F 
E)  -321°F

Question 5

How much heat is required to raise the temperature of a 225-g lead ball from 15.0°C to 25.0°C? The specific heat of lead is 128 J/(kg·K).

Accepted Answer

A)  725 J 
B)  576 J 
C)  145 J 
D)  217 J 
E)  288 J 
A)  725 J 
B)  576 J 
C)  145 J 
D)  217 J 
E)  288 J

Question 6

A wall consists of 2 layers of material:
 brick in front of an equal thickness of wood. If the respective thermal conductivities of the brick and wood are 1.3 J/m-s-C and 0.15 J/m-s-C, how does the temperature gradient across the wood compare to the gradient across the brick?

Accepted Answer

ΔT_w/ΔT_b = k_b/

Question 7

State the Zeroth Law of Thermodynamics.

Accepted Answer

If objects A and C are in ther

Question 8

550 g of water at 105°C are poured into an 855 g aluminum container with an initial temperature of 11°C. The specific heat of aluminum is 900 J/(kg·K). How much heat flows from the water to the aluminum, assuming no heat is exchanged with the surroundings?

Accepted Answer

A)  55 kJ 
B)  36 kJ 
C)  54 kJ 
D)  46 kJ 
E)  64 kJ 
A)  55 kJ 
B)  36 kJ 
C)  54 kJ 
D)  46 kJ 
E)  64 kJ

Question 9

The temperature in a room is 77°F. What is the corresponding temperature in the Celsius scale?

Accepted Answer

A)  81°C 
B)  77°C 
C)  43°C 
D)  25°C 
E)  18°C 
A)  81°C 
B)  77°C 
C)  43°C 
D)  25°C 
E)  18°C

Question 10

Convective heat transfer can only occur if fluids mediate the energy transfer.

Accepted Answer

A) True 
 B)False

Question 11

A camper carries her drinks in an ice chest made of styrofoam. The chest is 40 cm × 45 cm × 70 cm, and the walls and lid are 2.5 cm thick. The contents of the chest are ice, water, cans of soft drinks, and other food, all of which are in thermal equilibrium with the ice water. The temperature just outside the ice chest is 35°C. What is the rate of heat flow through the walls of the box? The thermal conductivity of styrofoam is 0.010 W/(m·K).

Accepted Answer

A)  14 W 
B)  16 W 
C)  18 W 
D)  20 W 
E)  22 W 
A)  14 W 
B)  16 W 
C)  18 W 
D)  20 W 
E)  22 W

Question 12

Conductive heat transfer can only occur if solids mediate the energy transfer.

Accepted Answer

A) True 
 B)False

Question 13

An industrial fabrication process stamps out thin metal pieces, each in the shape of a square with a circular hole in the middle, from a large thin sheet. These pieces are mounted in a large machine. As these pieces heat up during regular machine operation, the diameter of the circular hole will

Accepted Answer

A)  decrease. 
B)  stay the same. 
C)  increase. 
D)  behave unpredictably causing the machine to malfunction. 
A)  decrease. 
B)  stay the same. 
C)  increase. 
D)  behave unpredictably causing the machine to malfunction.

Question 14

FIGURE 16-3  
-The process whereby heat flows in the absence of any medium is referred to as

Accepted Answer

A)  conduction. 
B)  convection. 
C)  radiation. 
D)  inversion. 
E)  evaporation. 
A)  conduction. 
B)  convection. 
C)  radiation. 
D)  inversion. 
E)  evaporation.

Question 15

The process whereby heat flows by means of molecular collisions is referred to as

Accepted Answer

A)  conduction. 
B)  convection. 
C)  radiation. 
D)  inversion. 
E)  evaporation. 
A)  conduction. 
B)  convection. 
C)  radiation. 
D)  inversion. 
E)  evaporation.

Question 16

The amount of heat that flows through a rod whose ends are held at different temperatures is proportional to the area of the rod.

Accepted Answer

A) True 
 B)False

Question 17

Gallium boils at 2205°C. What is the corresponding temperature in the Fahrenheit scale?

Accepted Answer

A)  2205°F 
B)  3805°F 
C)  4001°F 
D)  5223°F 
E)  5548°F 
A)  2205°F 
B)  3805°F 
C)  4001°F 
D)  5223°F 
E)  5548°F

Question 18

A carpenter is driving a nail into a board. The 1.00-kg hammer is moving at 8.50 m/s when it strikes the nail. Assume that half of the kinetic energy of the hammer is transformed into heat in the 15.0-g steel nail and does not flow out. What is the increase in temperature of the nail after the three blows that the carpenter needs to drive the nail in completely? The specific heat of steel is 448 J/(kg·K).

Accepted Answer

A)  8.1 K 
B)  3.6 K 
C)  1.8 K 
D)  2.7 K 
E)  7.7 K 
A)  8.1 K 
B)  3.6 K 
C)  1.8 K 
D)  2.7 K 
E)  7.7 K

Question 19

The radius of the Sun is 6.95 × 108 m. It radiates heat at the rate of 5.32 x 1026 W. Assuming that it is a perfect emitter, what is the temperature of the surface of the Sun? The Stefan-Boltzmann constant is 5.67 x 10-8 W/(m2·K4).

Accepted Answer

A)  6.27 × 103 K 
B)  8.25 × 103 K 
C)  8.87 × 103 K 
D)  3.93 × 107 K 
E)  5.78 × 107 K 
A)  6.27 × 103 K 
B)  8.25 × 103 K 
C)  8.87 × 103 K 
D)  3.93 × 107 K 
E)  5.78 × 107 K

Question 20

An aluminum electric tea kettle has a mass of 500 g. It has a 500-W heating coil. How long will it take to heat up 1.0 kg of water from 18°C to 98°C in the tea kettle? The specific heat of aluminum is 900 J/(kg·K).

Accepted Answer

A)  5 minutes 
B)  7 minutes 
C)  12 minutes 
D)  15 minutes 
E)  18 minutes 
A)  5 minutes 
B)  7 minutes 
C)  12 minutes 
D)  15 minutes 
E)  18 minutes

Exam 16: Temperature and Heat

If you double the thickness of a wall built from a homogeneous material, the rate of heat loss for a given temperature difference across the thickness will

A 400-g piece of metal at 100°C is dropped into a 100-g aluminum cup containing 500 g of water at 15°C. The final temperature of the system is 40°C. What is the specific heat of the metal, assuming no heat is exchanged with the surroundings? The specific heat of aluminum is 900 J/(kg∙K)

Nitrogen boils at -196°C. What is the corresponding temperature in the Fahrenheit scale?

How much heat is required to raise the temperature of a 225-g lead ball from 15.0°C to 25.0°C? The specific heat of lead is 128 J/(kg·K).

A wall consists of 2 layers of material: brick in front of an equal thickness of wood. If the respective thermal conductivities of the brick and wood are 1.3 J/m-s-C and 0.15 J/m-s-C, how does the temperature gradient across the wood compare to the gradient across the brick?

State the Zeroth Law of Thermodynamics.

550 g of water at 105°C are poured into an 855 g aluminum container with an initial temperature of 11°C. The specific heat of aluminum is 900 J/(kg·K). How much heat flows from the water to the aluminum, assuming no heat is exchanged with the surroundings?

The temperature in a room is 77°F. What is the corresponding temperature in the Celsius scale?

Convective heat transfer can only occur if fluids mediate the energy transfer.

Conductive heat transfer can only occur if solids mediate the energy transfer.

An industrial fabrication process stamps out thin metal pieces, each in the shape of a square with a circular hole in the middle, from a large thin sheet. These pieces are mounted in a large machine. As these pieces heat up during regular machine operation, the diameter of the circular hole will

FIGURE 16-3 -The process whereby heat flows in the absence of any medium is referred to as

The process whereby heat flows by means of molecular collisions is referred to as

The amount of heat that flows through a rod whose ends are held at different temperatures is proportional to the area of the rod.

Gallium boils at 2205°C. What is the corresponding temperature in the Fahrenheit scale?

The radius of the Sun is 6.95 × 108 m. It radiates heat at the rate of 5.32 x 1026 W. Assuming that it is a perfect emitter, what is the temperature of the surface of the Sun? The Stefan-Boltzmann constant is 5.67 x 10-8 W/(m2·K4).

An aluminum electric tea kettle has a mass of 500 g. It has a 500-W heating coil. How long will it take to heat up 1.0 kg of water from 18°C to 98°C in the tea kettle? The specific heat of aluminum is 900 J/(kg·K).

Introduction to Physics

One-Dimensional Kinematics

Vectors in Physics

Two-Dimensional Kinematics

Newtons Laws of Motion

Applications of Newtons Laws

Work and Kinetic Energy

Potential Energy and Conservation of Energy

Linear Momentum and Collisions

Rotational Kinematics and Energy

Rotational Dynamics and Static Equilibrium

Gravity

Oscillations About Equilibrium

Waves and Sound

Fluids

Phases and Phase Changes

The Laws of Thermodynamics

Electric Charges, Forces, and Fields

Electric Potential and Electric Potential Energy

Electric Current and Direct-Current Circuits

Magnetism

Magnetic Flux and Faradays Law of Induction

Alternating-Current Circuits

Electromagnetic Waves

Geometrical Optics

Optical Instruments

Physical Optics: Interference and Diffraction

Relativity

Quantum Physics

Atomic Physics

Nuclear Physics and Nuclear Radiation

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The radius of the Sun is 6.95 × 10⁸ m. It radiates heat at the rate of 5.32 x 10²⁶ W. Assuming that it is a perfect emitter, what is the temperature of the surface of the Sun? The Stefan-Boltzmann constant is 5.67 x 10^-8 W/(m²·K⁴).