Question 1

When a bimetallic strip is heated, the strip will bend toward the side

Accepted Answer

A)  with the larger coefficient of linear expansion. 
B)  with the smaller coefficient of linear expansion. 
C)  with the higher temperature. 
D)  with the lower temperature. 
A)  with the larger coefficient of linear expansion. 
B)  with the smaller coefficient of linear expansion. 
C)  with the higher temperature. 
D)  with the lower temperature.

Question 2

Gas in a constant-volume gas thermometer registers a pressure of 95.0 kPa at 100°C. Assuming ideal behavior, what is the temperature of this gas when the pressure is 190 kPa?

Accepted Answer

A)  546°C 
B)  527°C 
C)  491°C 
D)  473°C 
E)  200°C 
A)  546°C 
B)  527°C 
C)  491°C 
D)  473°C 
E)  200°C

Question 3

A person running in place on an exercise machine for 10 minutes uses up 17 Calories. Another person exercises by repeatedly lifting two 2.5-kg weights a distance of 50 cm. How many repetitions of this exercise are equivalent to 10 minutes of running?

Accepted Answer

A)  730 
B)  1450 
C)  1500 
D)  2200 
E)  2900 
A)  730 
B)  1450 
C)  1500 
D)  2200 
E)  2900

Question 4

Two objects are placed in a room with a temperature of 20°C. Object A has a temperature of 70°C, while object B has a temperature of 140°C. They have the same emissivity, but different areas. What should the ratio of the area of object A to that of object B be if the net power emitted by both objects is the same?

Accepted Answer

A)  2.0 
B)  3.4 
C)  5.2 
D)  17 
E)  21 
A)  2.0 
B)  3.4 
C)  5.2 
D)  17 
E)  21

Question 5

The type of heat transfer that occurs between warm food and the air in the room is principally

Accepted Answer

A)  convective. 
B)  conductive. 
C)  radiative. 
D)  countercurrent. 
E)  evaporation. 
A)  convective. 
B)  conductive. 
C)  radiative. 
D)  countercurrent. 
E)  evaporation.

Question 6

330 g of water at 45°C are poured into an 855 g aluminum container with an initial temperature of 10°C. The specific heat of aluminum is 900 J/(kg·K). What is the final temperature of the system, assuming no heat is exchanged with the surroundings?

Accepted Answer

A)  28°C 
B)  32°C 
C)  31°C 
D)  33°C 
E)  35°C 
A)  28°C 
B)  32°C 
C)  31°C 
D)  33°C 
E)  35°C

Question 7

A double-paned window consists of two 60.0 cm × 100 cm glass panes, 2.00 mm thick, separated by a 1.50 cm layer of still air. 25.0 W of heat flow through the window. What is the temperature difference between the indoors and outdoors? The thermal conductivity of glass is 0.840 W/(m·K), and that of air is 0.0234 W/(m·K).

Accepted Answer

A)  27.6 K 
B)  27.3 K 
C)  26.9 K 
D)  26.7 K 
E)  26.3 K 
A)  27.6 K 
B)  27.3 K 
C)  26.9 K 
D)  26.7 K 
E)  26.3 K

Question 8

A jogger is running outdoors on a cold day when the temperature is -20.0°C. Each time she breathes, she inhales 0.00450 m3 of air. She is breathing at the rate of 25 breaths per minute. How much heat does she lose from breathing during 20.0 minutes of jogging if the air in her lungs is heated to body temperature (37°C) before it is exhaled? The specific heat of air is 1020 J/(kg∙K) and the density of air is 1.29 kg/m3.

Accepted Answer

A)  169 kJ 
B)  278 kJ 
C)  354 kJ 
D)  431 kJ 
E)  543 kJ 
A)  169 kJ 
B)  278 kJ 
C)  354 kJ 
D)  431 kJ 
E)  543 kJ

Question 9

Two metal rods, one silver and the other gold, are attached to each other. The free end of the silver rod is connected to a steam chamber, with a temperature of 100°C, and the free end of the gold rod to an ice water bath, with a temperature of 0°C. The rods are 5.0 cm long and have a square cross-section, 2.0 cm on a side. What is the temperature at the point where the two rods are in contact with one another? The thermal conductivity of silver is 417 W/(m·K) and that of gold is 291 W/(m·K) No heat is exchanged between the rods and the surroundings, except at the ends.

Accepted Answer

A)  39°C 
B)  41°C 
C)  47°C 
D)  53°C 
E)  59°C 
A)  39°C 
B)  41°C 
C)  47°C 
D)  53°C 
E)  59°C

Question 10

The process whereby heat flows by the mass movement of molecules from one place to another 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 11

A camper is about to drink his morning coffee. He pours 400 grams of coffee, initially at 75.0°C into a 250-g aluminum cup, initially at 16.0°C. What is the equilibrium temperature of the coffee-cup system, assuming no heat is lost to the surroundings? The specific heat of aluminum is 900 J/(kg·K). Assume that the specific heat of coffee is the same as the specific heat of water.

Accepted Answer

A)  45.5°C 
B)  62.0°C 
C)  65.0°C 
D)  68.0°C 
E)  71.0°C 
A)  45.5°C 
B)  62.0°C 
C)  65.0°C 
D)  68.0°C 
E)  71.0°C

Question 12

FIGURE 16-3  
-Two metal rods are to be used to conduct heat from a region at 100°C to a region at 0°C as shown in Figure 16-3. The rods can be placed in parallel, as shown on the left, or in series, as on the right. The heat conducted in the series arrangement is

Accepted Answer

A)  greater than the heat conducted with the rods in parallel. 
B)  the same as the heat conducted with the rods in parallel. 
C)  less than the heat conducted with the rods in parallel. 
D)  impossible to compare with the heat conducted with the rods in parallel. 
A)  greater than the heat conducted with the rods in parallel. 
B)  the same as the heat conducted with the rods in parallel. 
C)  less than the heat conducted with the rods in parallel. 
D)  impossible to compare with the heat conducted with the rods in parallel.

Question 13

Two identical objects are placed in a room with a temperature of 20°C. Object A has a temperature of 50°C, while object B has a temperature of 90°C. What is the ratio of the net power emitted by object B to that emitted by object A?

Accepted Answer

A)  1.7 
B)  2.8 
C)  81 
D)  17 
E)  21 
A)  1.7 
B)  2.8 
C)  81 
D)  17 
E)  21

Question 14

The thermal conductivity of concrete is 0.80 W/m-C° and the thermal conductivity of wood is 0.10 W/m-C°. How thick would a solid concrete wall have to be in order to have the same rate of flow through it as an 8.0 cm thick wall made of solid wood?
 (Assume both walls have the same surface area.)

Accepted Answer

The answer of The thermal conductivity of concrete is 0.80...

Question 15

The coefficient of linear expansion of aluminum is 24 × 10-6 K-1 and the coefficient of volume expansion of olive oil is 0.68 × 10-3 K-1. A novice cook, in preparation for deep-frying some potatoes fills a 1.00-liter aluminum pot to the brim and heats the oil and the pot from an initial temperature of 15°C to 190°C. To his consternation some olive oil spills over the top. How much?

Accepted Answer

A)  0.11 liters 
B)  0.12 liters 
C)  0.13 liters 
D)  0.14 liters 
E)  0.15 liters 
A)  0.11 liters 
B)  0.12 liters 
C)  0.13 liters 
D)  0.14 liters 
E)  0.15 liters

Question 16

When you walk barefoot in a room, the floor feels cooler walking on a tile floor as compared to a wooden floor because

Accepted Answer

A)  tile has a smaller specific heat than wood. 
B)  tile has a larger specific heat than wood. 
C)  tile has a smaller thermal conductivity than wood. 
D)  tile has a larger thermal conductivity than wood. 
E)  none of the above 
A)  tile has a smaller specific heat than wood. 
B)  tile has a larger specific heat than wood. 
C)  tile has a smaller thermal conductivity than wood. 
D)  tile has a larger thermal conductivity than wood. 
E)  none of the above

Question 17

A person tries to heat up her bath water by adding 5.0 L of water at 80°C to 60 L of water at 30°C. What is the final temperature of the water?

Accepted Answer

The answer of A person tries to heat up her...

Question 18

If a thermometer measures the temperature of two objects as being equal, you can conclude that if the objects are placed in thermal contact, no heat will flow between them.

Accepted Answer

A) True 
 B)False

Question 19

Betelgeuse is a star in the constellation Orion. It radiates heat at the rate of 3.00 × 1030 W and has a surface temperature of 3000 K. Assuming that it is a perfect emitter, what is the radius of Betelgeuse? The Stefan-Boltzmann constant is 5.67 x 10-8 W/(m2·K4).

Accepted Answer

A)  7.80 × 1010 m 
B)  8.70 × 1010 m 
C)  1.40 × 1011 m 
D)  1.90 × 1011 m 
E)  2.30 × 1011 m 
A)  7.80 × 1010 m 
B)  8.70 × 1010 m 
C)  1.40 × 1011 m 
D)  1.90 × 1011 m 
E)  2.30 × 1011 m

Question 20

A solid concrete wall 4.0 m by 2.4 m and 30 cm thick, with a thermal conductivity of 1.3 W/(m∙K), separates a basement at 18°C from the ground outside at 6°C. How much heat flows through the wall in one hour?

Accepted Answer

A)  1.8 MJ 
B)  1.8 kJ 
C)  500 J 
D)  5.0 MJ 
E)  5.0 kJ 
A)  1.8 MJ 
B)  1.8 kJ 
C)  500 J 
D)  5.0 MJ 
E)  5.0 kJ

Exam 16: Temperature and Heat

When a bimetallic strip is heated, the strip will bend toward the side

Gas in a constant-volume gas thermometer registers a pressure of 95.0 kPa at 100°C. Assuming ideal behavior, what is the temperature of this gas when the pressure is 190 kPa?

A person running in place on an exercise machine for 10 minutes uses up 17 Calories. Another person exercises by repeatedly lifting two 2.5-kg weights a distance of 50 cm. How many repetitions of this exercise are equivalent to 10 minutes of running?

The type of heat transfer that occurs between warm food and the air in the room is principally

330 g of water at 45°C are poured into an 855 g aluminum container with an initial temperature of 10°C. The specific heat of aluminum is 900 J/(kg·K). What is the final temperature of the system, assuming no heat is exchanged with the surroundings?

The process whereby heat flows by the mass movement of molecules from one place to another is referred to as

FIGURE 16-3 -Two metal rods are to be used to conduct heat from a region at 100°C to a region at 0°C as shown in Figure 16-3. The rods can be placed in parallel, as shown on the left, or in series, as on the right. The heat conducted in the series arrangement is

Two identical objects are placed in a room with a temperature of 20°C. Object A has a temperature of 50°C, while object B has a temperature of 90°C. What is the ratio of the net power emitted by object B to that emitted by object A?

The thermal conductivity of concrete is 0.80 W/m-C° and the thermal conductivity of wood is 0.10 W/m-C°. How thick would a solid concrete wall have to be in order to have the same rate of flow through it as an 8.0 cm thick wall made of solid wood? (Assume both walls have the same surface area.)

When you walk barefoot in a room, the floor feels cooler walking on a tile floor as compared to a wooden floor because

A person tries to heat up her bath water by adding 5.0 L of water at 80°C to 60 L of water at 30°C. What is the final temperature of the water?

If a thermometer measures the temperature of two objects as being equal, you can conclude that if the objects are placed in thermal contact, no heat will flow between them.

Betelgeuse is a star in the constellation Orion. It radiates heat at the rate of 3.00 × 1030 W and has a surface temperature of 3000 K. Assuming that it is a perfect emitter, what is the radius of Betelgeuse? The Stefan-Boltzmann constant is 5.67 x 10-8 W/(m2·K4).

A solid concrete wall 4.0 m by 2.4 m and 30 cm thick, with a thermal conductivity of 1.3 W/(m∙K), separates a basement at 18°C from the ground outside at 6°C. How much heat flows through the wall in one hour?

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

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Physical Optics: Interference and Diffraction

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Betelgeuse is a star in the constellation Orion. It radiates heat at the rate of 3.00 × 10³⁰ W and has a surface temperature of 3000 K. Assuming that it is a perfect emitter, what is the radius of Betelgeuse? The Stefan-Boltzmann constant is 5.67 x 10^-8 W/(m²·K⁴).