Question 1

The type of heat transfer that occurs between a stove and a pot placed on it is

Accepted Answer

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

Question 2

At what temperature are the numerical readings on the Fahrenheit and Celsius scales the same?

Accepted Answer

The answer of At what temperature are the numerical readings...

Question 3

The coefficient of linear expansion of copper is 17 × 10-6 K-1. A sheet of copper has a round hole with a radius of 3.0 m cut out of it. If the sheet is heated and undergoes a change in temperature of 80 K, what is the change in the radius of the hole?

Accepted Answer

A)  It decreases by 4.1 mm. 
B)  It increases by 4.1 mm. 
C)  It decreases by 8.2 mm. 
D)  It increases by 8.2 mm. 
E)  It does not change. 
A)  It decreases by 4.1 mm. 
B)  It increases by 4.1 mm. 
C)  It decreases by 8.2 mm. 
D)  It increases by 8.2 mm. 
E)  It does not change.

Question 4

What is the ratio of the pressure that a constant-volume gas thermometer registers at the boiling point of water to the pressure it registers at the freezing point?

Accepted Answer

A)  1.00 
B)  1.24 
C)  1.32 
D)  1.37 
E)  1.80 
A)  1.00 
B)  1.24 
C)  1.32 
D)  1.37 
E)  1.80

Question 5

A 5.00-g lead bullet moving at 440 m/s penetrates a wood block and comes to rest inside the block. If half of its kinetic energy goes into heating the bullet, what is the bullet's change in temperature? The specific heat of lead is 128 J/(kg·K).

Accepted Answer

A)  94.0 K 
B)  110 K 
C)  126 K 
D)  278 K 
E)  378 K 
A)  94.0 K 
B)  110 K 
C)  126 K 
D)  278 K 
E)  378 K

Question 6

When a bimetallic strip is cooled, 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 7

A pendulum clock has a pendulum shaft made of aluminum which has a coefficient of linear expansion of 24.0 × 10-6 K-1. At 22°C the period of swing of the pendulum is 1.00 s. If the temperature is reduced to 5°C, how much time does the clock gain or lose in one day?

Accepted Answer

A)  It gains 18 s per day. 
B)  It loses 18 s per day. 
C)  It gains 9.0 s per day. 
D)  It loses 9.0 s per day. 
E)  It neither gains nor loses time. 
A)  It gains 18 s per day. 
B)  It loses 18 s per day. 
C)  It gains 9.0 s per day. 
D)  It loses 9.0 s per day. 
E)  It neither gains nor loses time.

Question 8

You are given a piece of pie straight out of the oven, so the crust and the filling are at the same temperature. You sample a piece of crust with no problem, but when you put a piece of filling in your mouth, you burn your tongue. Why?

Accepted Answer

Because the filling is moist w

Question 9

Ten meter long steel railroad rails are laid end to end, with no space between, on a hot day when the temperature is 115.°F. Six months later the temperature has dropped to -2.°F. How much space now exists between each rail?
 [ linear expansion coef. for steel is 12. × 10-6 C°-1]

Accepted Answer

Question 10

If a thermometer measures the temperature of two objects as being equal, you can conclude that the objects will be in thermal equilibrium if they are brought into thermal contact.

Accepted Answer

A) True 
 B)False

Question 11

The filament in a light bulb has a diameter of 0.050 mm and an emissivity e = 1.0. The temperature of the filament is 3000°C. How long should the filament be in order to radiate 60 W of power? The Stefan-Boltzmann constant is 5.67 x 10-8 W/(m2·K4).

Accepted Answer

A)  11 cm 
B)  9.4 cm 
C)  8.6 cm 
D)  7.2 cm 
E)  5.9 cm 
A)  11 cm 
B)  9.4 cm 
C)  8.6 cm 
D)  7.2 cm 
E)  5.9 cm

Question 12

The type of heat transfer that occurs between a heating lamp and the food that it is keeping warm is

Accepted Answer

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

Question 13

A 400-g stainless steel tea kettle containing 500 g of water is on top of the stove. The portion of the tea kettle that is in contact with the heating element has an area of 0.090 m2 and is 2.0 mm thick. At a certain moment, the temperature of the water is 75°C, and it is rising at the rate of 3C° per minute. What is the difference in temperature between the inside and the outside of the bottom of the tea kettle? The thermal conductivity of stainless steel is 16.3 W/(m·K) and the specific heat is 448 J/(kg·K).

Accepted Answer

A)  2.2°C 
B)  1.5°C 
C)  1.1°C 
D)  0.50°C 
E)  0.015°C 
A)  2.2°C 
B)  1.5°C 
C)  1.1°C 
D)  0.50°C 
E)  0.015°C

Question 14

The Concorde's exterior is made of aluminum, which has a coefficient of linear expansion of 24 × 10-6 K-1. At 15°C, the Concorde measures 62.1 m in length. When the plane is in flight, friction with the air increases the temperature of the exterior skin to 200°C. What is the change in the length of the outer skin of the Concorde?

Accepted Answer

A)  20 cm 
B)  24 cm 
C)  28 cm 
D)  32 cm 
E)  36 cm 
A)  20 cm 
B)  24 cm 
C)  28 cm 
D)  32 cm 
E)  36 cm

Question 15

A 400-g piece of metal at 120°C is dropped into a cup containing 450 g of water at 15.0°C. The final temperature of the system is 40.0°C. What is the specific heat of the metal, assuming no heat is exchanged with the surroundings or the cup?

Accepted Answer

A)  1470 J/(kg∙K) 
B)  2830 J/(kg∙K) 
C)  3420 J/(kg∙K) 
D)  3780 J/(kg∙K) 
E)  4280 J/(kg∙K) 
A)  1470 J/(kg∙K) 
B)  2830 J/(kg∙K) 
C)  3420 J/(kg∙K) 
D)  3780 J/(kg∙K) 
E)  4280 J/(kg∙K)

Question 16

A glass tea kettle containing 500 g of water is on top of the stove. The portion of the tea kettle that is in contact with the heating element has an area of 0.090 m2 and is 1.5 mm thick. At a certain moment, the temperature of the water is 75°C, and it is rising at the rate of 3 C° per minute. What is the temperature of the outside surface of the bottom of the tea kettle? The thermal conductivity of glass is 0.840 W/(m·K). Neglect the heat capacity of the kettle.

Accepted Answer

A)  39°C 
B)  92°C 
C)  120°C 
D)  86°C 
E)  77°C 
A)  39°C 
B)  92°C 
C)  120°C 
D)  86°C 
E)  77°C

Question 17

FIGURE 16-2  
-Consider a flat steel plate with a hole through its center as shown in Figure 16-2. When the plate's temperature is decreased, the hole will

Accepted Answer

A)  contract only if it takes up more than half the plate's surface area. 
B)  expand if it takes up less than half the plate's surface area. 
C)  contract. 
D)  expand. 
E)  remain the same size. 
A)  contract only if it takes up more than half the plate's surface area. 
B)  expand if it takes up less than half the plate's surface area. 
C)  contract. 
D)  expand. 
E)  remain the same size.

Question 18

FIGURE 16-2  
-Consider a flat steel plate with a hole through its center as shown in Figure 16-2. When the plate's temperature is increased, the hole will

Accepted Answer

A)  expand only if it takes up more than half the plate's surface area. 
B)  contract if it takes up less than half the plate's surface area. 
C)  always contract. 
D)  always expand. 
E)  remain the same size. 
A)  expand only if it takes up more than half the plate's surface area. 
B)  contract if it takes up less than half the plate's surface area. 
C)  always contract. 
D)  always expand. 
E)  remain the same size.

Question 19

FIGURE 16-1  
-Refer to Figure 16-1. A bimetallic strip, consisting of metal G on the top and metal H on the bottom, is rigidly attached to a wall at the left. The coefficient of linear thermal expansion for metal G is greater than that of metal H. If the strip is uniformly heated, it will

Accepted Answer

A)  curve upward. 
B)  curve downward. 
C)  remain horizontal, but get longer. 
D)  remain horizontal, but get shorter. 
E)  bend in the middle. 
A)  curve upward. 
B)  curve downward. 
C)  remain horizontal, but get longer. 
D)  remain horizontal, but get shorter. 
E)  bend in the middle.

Question 20

You are removing a pie from a 350°F oven, and while you need to protect your hands from the pie pan, the backs of your hands and your wrists and forearms are unprotected, yet they don't get burned. Why?

Accepted Answer

Your body is largely water,whi

Exam 16: Temperature and Heat

The type of heat transfer that occurs between a stove and a pot placed on it is

At what temperature are the numerical readings on the Fahrenheit and Celsius scales the same?

The coefficient of linear expansion of copper is 17 × 10-6 K-1. A sheet of copper has a round hole with a radius of 3.0 m cut out of it. If the sheet is heated and undergoes a change in temperature of 80 K, what is the change in the radius of the hole?

What is the ratio of the pressure that a constant-volume gas thermometer registers at the boiling point of water to the pressure it registers at the freezing point?

A 5.00-g lead bullet moving at 440 m/s penetrates a wood block and comes to rest inside the block. If half of its kinetic energy goes into heating the bullet, what is the bullet's change in temperature? The specific heat of lead is 128 J/(kg·K).

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

A pendulum clock has a pendulum shaft made of aluminum which has a coefficient of linear expansion of 24.0 × 10-6 K-1. At 22°C the period of swing of the pendulum is 1.00 s. If the temperature is reduced to 5°C, how much time does the clock gain or lose in one day?

You are given a piece of pie straight out of the oven, so the crust and the filling are at the same temperature. You sample a piece of crust with no problem, but when you put a piece of filling in your mouth, you burn your tongue. Why?

Ten meter long steel railroad rails are laid end to end, with no space between, on a hot day when the temperature is 115.°F. Six months later the temperature has dropped to -2.°F. How much space now exists between each rail? [ linear expansion coef. for steel is 12. × 10-6 C°-1]

If a thermometer measures the temperature of two objects as being equal, you can conclude that the objects will be in thermal equilibrium if they are brought into thermal contact.

The filament in a light bulb has a diameter of 0.050 mm and an emissivity e = 1.0. The temperature of the filament is 3000°C. How long should the filament be in order to radiate 60 W of power? The Stefan-Boltzmann constant is 5.67 x 10-8 W/(m2·K4).

The type of heat transfer that occurs between a heating lamp and the food that it is keeping warm is

A 400-g piece of metal at 120°C is dropped into a cup containing 450 g of water at 15.0°C. The final temperature of the system is 40.0°C. What is the specific heat of the metal, assuming no heat is exchanged with the surroundings or the cup?

FIGURE 16-2 -Consider a flat steel plate with a hole through its center as shown in Figure 16-2. When the plate's temperature is decreased, the hole will

FIGURE 16-2 -Consider a flat steel plate with a hole through its center as shown in Figure 16-2. When the plate's temperature is increased, the hole will

FIGURE 16-1 -Refer to Figure 16-1. A bimetallic strip, consisting of metal G on the top and metal H on the bottom, is rigidly attached to a wall at the left. The coefficient of linear thermal expansion for metal G is greater than that of metal H. If the strip is uniformly heated, it will

You are removing a pie from a 350°F oven, and while you need to protect your hands from the pie pan, the backs of your hands and your wrists and forearms are unprotected, yet they don't get burned. Why?

Introduction to Physics

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Vectors in Physics

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The coefficient of linear expansion of copper is 17 × 10^-6 K^-1. A sheet of copper has a round hole with a radius of 3.0 m cut out of it. If the sheet is heated and undergoes a change in temperature of 80 K, what is the change in the radius of the hole?

A pendulum clock has a pendulum shaft made of aluminum which has a coefficient of linear expansion of 24.0 × 10^-⁶ K^-1. At 22°C the period of swing of the pendulum is 1.00 s. If the temperature is reduced to 5°C, how much time does the clock gain or lose in one day?

Ten meter long steel railroad rails are laid end to end, with no space between, on a hot day when the temperature is 115.°F. Six months later the temperature has dropped to -2.°F. How much space now exists between each rail? [ linear expansion coef. for steel is 12. × 10^-6C°^-1]

The filament in a light bulb has a diameter of 0.050 mm and an emissivity e = 1.0. The temperature of the filament is 3000°C. How long should the filament be in order to radiate 60 W of power? The Stefan-Boltzmann constant is 5.67 x 10^-8 W/(m²·K⁴).