Question 1

Which of the following best describes a substance in which the temperature remains constant while at the same time it is experiencing an inward heat flow?

Accepted Answer

A)  gas 
B)  liquid 
C)  solid 
D)  substance undergoing a change of state 
A)  gas 
B)  liquid 
C)  solid 
D)  substance undergoing a change of state

Question 2

The zeroth law of thermodynamics pertains to what relational condition that may exist between two systems?

Accepted Answer

A)  zero net forces 
B)  zero velocities 
C)  zero temperature 
D)  thermal equilibrium 
A)  zero net forces 
B)  zero velocities 
C)  zero temperature 
D)  thermal equilibrium

Question 3

A brass cube, 10 cm on a side, is raised in temperature by 150$\degree$C. The coefficient of volume expansion of brass is 57 *10 - 6/$\degree$C. By what percentage is any one of the 10-cm edges increased in length?

Accepted Answer

A)  4% 
B)  2.8% 
C)  0.38% 
D)  0.29% 
A)  4% 
B)  2.8% 
C)  0.38% 
D)  0.29%

Question 4

What happens to its moment of inertia when a steel disk is heated?

Accepted Answer

A)  It increases. 
B)  It decreases. 
C)  It stays the same. 
D)  It increases for half the temperature increase and then decreases for the rest of the temperature increase. 
A)  It increases. 
B)  It decreases. 
C)  It stays the same. 
D)  It increases for half the temperature increase and then decreases for the rest of the temperature increase.

Question 5

A substance is heated from 15$\degree$C to 45$\degree$C. What would the same incremental change be when registered in kelvins?

Accepted Answer

A)  20 
B)  40 
C)  30 
D)  313 
A)  20 
B)  40 
C)  30 
D)  313

Question 6

In winter, light-colored clothes will keep you warmer than dark-colored clothes if:

Accepted Answer

A)  you are warmer than your surroundings. 
B)  you are at the same temperature as your surroundings. 
C)  you are cooler than your surroundings. 
D)  you are standing in sunlight. 
A)  you are warmer than your surroundings. 
B)  you are at the same temperature as your surroundings. 
C)  you are cooler than your surroundings. 
D)  you are standing in sunlight.

Question 7

If a 2100-kg car was moving at 30 m/s, what would be its kinetic energy expressed in the unusual (for kinetic energy) units of calories? (1 cal = 4.186 J)

Accepted Answer

A)  3.0 * 104 
B)  2.3 * 105 
C)  3.8 * 106 
D)  1.1 *105 
A)  3.0 * 104 
B)  2.3 * 105 
C)  3.8 * 106 
D)  1.1 *105

Question 8

A silver bar of length 30 cm and cross-sectional area 2.0 cm2 is used to transfer heat from a 100$\degree$C reservoir to a 0$\degree$C block of ice. How much ice is melted per second? (For silver, k = 427 W / m ·$\degree$C. For ice, Lf = 334,000 J/kg.)

Accepted Answer

A)  4.2 g/s 
B)  0.085 g/s 
C)  0.80 g/s 
D)  0.043 g/s 
A)  4.2 g/s 
B)  0.085 g/s 
C)  0.80 g/s 
D)  0.043 g/s

Question 9

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 10

The emissivity of an ideal reflector has which of the following values?

Accepted Answer

A)  0 
B)  1 
C)  100 
D)  infinity 
A)  0 
B)  1 
C)  100 
D)  infinity

Question 11

In typical calorimetry problems, what is the usual conservation law being used?

Accepted Answer

A)  energy 
B)  heat 
C)  temperature 
D)  None since nothing is being conserved. 
A)  energy 
B)  heat 
C)  temperature 
D)  None since nothing is being conserved.

Question 12

A hot (70$\degree$C) lump of metal has a mass of 250 g and a specific heat of 0.25 cal/g·$\degree$C. John drops the metal into a 500-g calorimeter containing 40 g of water at 20$\degree$C. The calorimeter is constructed of a material that has a specific heat of 0.10 cal/ g·$\degree$C. When equilibrium is reached, what will be the final temperature? (cwater = 1.00 cal/g·$\degree$C.)

Accepted Answer

A)  114$\degree$C 
B)  72$\degree$C 
C)  40$\degree$C 
D)  37$\degree$C 
A)  114$\degree$C 
B)  72$\degree$C 
C)  40$\degree$C 
D)  37$\degree$C

Question 13

An inventor develops a stationary cycling device by which an individual, while pedaling, can convert all of the energy expended into heat for warming water. What minimum power must be generated if 300 g of water (enough for 1 cup of coffee) is to be heated in 10 min from 30$\degree$C to 90$\degree$C? (1 cal = 4.186 J, the specific heat of water is 4 186 J/kg ·$\degree$C)

Accepted Answer

A)  9400 W 
B)  590 W 
C)  160 W 
D)  130 W 
A)  9400 W 
B)  590 W 
C)  160 W 
D)  130 W

Question 14

Which of the following statements is true?

Accepted Answer

A)  A hot object contains a lot of heat. 
B)  A cold object contains only a little heat. 
C)  Objects do not contain heat. 
D)  Statements a and b are true. 
A)  A hot object contains a lot of heat. 
B)  A cold object contains only a little heat. 
C)  Objects do not contain heat. 
D)  Statements a and b are true.

Question 15

Of the following systems, which contains the most heat?

Accepted Answer

A)  100 kg of water at 80°C 
B)  250 kg of water at 40°C 
C)  600 kg of ice at 0°C 
D)  Systems do not contain heat. 
A)  100 kg of water at 80°C 
B)  250 kg of water at 40°C 
C)  600 kg of ice at 0°C 
D)  Systems do not contain heat.

Question 16

Which type of heating causes sunburn?

Accepted Answer

A)  conduction 
B)  convection 
C)  radiation 
D)  all of the above 
A)  conduction 
B)  convection 
C)  radiation 
D)  all of the above

Question 17

In cloud formation, water vapor turns into water droplets which get bigger and bigger until it rains. This will cause the temperature of the air in the clouds to:

Accepted Answer

A)  get warmer. 
B)  get cooler. 
C)  will not affect the temperature of the air in the clouds. 
D)  There is no air in clouds. 
A)  get warmer. 
B)  get cooler. 
C)  will not affect the temperature of the air in the clouds. 
D)  There is no air in clouds.

Question 18

A steel wire, 100 m long at 10$\degree$C, has a coefficient of linear expansion of 11*10 - 6/$\degree$C. Give its change in length as the temperature changes from 10$\degree$C to 45$\degree$C.

Accepted Answer

A)  0.65 cm 
B)  3.8 cm 
C)  5.8 cm 
D)  12 cm 
A)  0.65 cm 
B)  3.8 cm 
C)  5.8 cm 
D)  12 cm

Question 19

If cooking is done using an aluminum pan over an electric burner, which of the following will not promote the rate of heat flow from burner to food?

Accepted Answer

A)  increase pan bottom thickness 
B)  increase pan bottom area 
C)  increase burner temperature 
D)  decrease height of pan sides 
A)  increase pan bottom thickness 
B)  increase pan bottom area 
C)  increase burner temperature 
D)  decrease height of pan sides

Question 20

A steel piano string is attached, under tension, at each end to secure posts. When gently struck, a faint note can be detected coming from the string. The string is then cooled by blowing cold air over it and then is struck again. How does the note now detected compare to the previous one.

Accepted Answer

A)  It is the same since the posts don't move. 
B)  It is at a higher frequency than the original one. 
C)  It is at a lower frequency than the original one. 
D)  More than one answer is correct. 
A)  It is the same since the posts don't move. 
B)  It is at a higher frequency than the original one. 
C)  It is at a lower frequency than the original one. 
D)  More than one answer is correct.

Exam 14: Temperature and Heat

Which of the following best describes a substance in which the temperature remains constant while at the same time it is experiencing an inward heat flow?

The zeroth law of thermodynamics pertains to what relational condition that may exist between two systems?

A brass cube, 10 cm on a side, is raised in temperature by 150 °\degree° C. The coefficient of volume expansion of brass is 57 *10 - 6/ °\degree° C. By what percentage is any one of the 10-cm edges increased in length?

What happens to its moment of inertia when a steel disk is heated?

A substance is heated from 15 °\degree° C to 45 °\degree° C. What would the same incremental change be when registered in kelvins?

In winter, light-colored clothes will keep you warmer than dark-colored clothes if:

If a 2100-kg car was moving at 30 m/s, what would be its kinetic energy expressed in the unusual (for kinetic energy) units of calories? (1 cal = 4.186 J)

A silver bar of length 30 cm and cross-sectional area 2.0 cm2 is used to transfer heat from a 100 °\degree° C reservoir to a 0 °\degree° C block of ice. How much ice is melted per second? (For silver, k = 427 W / m · °\degree° C. For ice, Lf = 334,000 J/kg.)

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

The emissivity of an ideal reflector has which of the following values?

In typical calorimetry problems, what is the usual conservation law being used?

Which of the following statements is true?

Of the following systems, which contains the most heat?

Which type of heating causes sunburn?

In cloud formation, water vapor turns into water droplets which get bigger and bigger until it rains. This will cause the temperature of the air in the clouds to:

A steel wire, 100 m long at 10 °\degree° C, has a coefficient of linear expansion of 11*10 - 6/ °\degree° C. Give its change in length as the temperature changes from 10 °\degree° C to 45 °\degree° C.

If cooking is done using an aluminum pan over an electric burner, which of the following will not promote the rate of heat flow from burner to food?

A steel piano string is attached, under tension, at each end to secure posts. When gently struck, a faint note can be detected coming from the string. The string is then cooled by blowing cold air over it and then is struck again. How does the note now detected compare to the previous one.

Introduction

Motion, Forces, and Newtons Laws

Forces and Motion in One Dimension

Forces and Motion in Two and Three Dimensions

Circular Motion and Gravitation

Work and Energy

Momentum, Impulse, and Collisions

Rotational Motion

Energy and Momentum of Rotational Motion

Fluids

Harmonic Motion and Elasticity

Waves

Sound

Gases and Kinetic Theory

Thermodynamics

Electric Forces and Fields

Electric Potential

Electric Currents and Circuits

Magnetic Fields and Forces

Magnetic Induction

Alternating-Current Circuits and Machines

Electromagnetic Waves

Geometrical Optics

Wave Optics

Applications of Optics

Relativity

Quantum Theory

Atomic Theory

Nuclear Physics

Physics in the 21st Century

Filters

A brass cube, 10 cm on a side, is raised in temperature by 150 $\degree$ C. The coefficient of volume expansion of brass is 57 *10 ^- ⁶/ $\degree$ C. By what percentage is any one of the 10-cm edges increased in length?

A substance is heated from 15 $\degree$ C to 45 $\degree$ C. What would the same incremental change be when registered in kelvins?

A silver bar of length 30 cm and cross-sectional area 2.0 cm² is used to transfer heat from a 100 $\degree$ C reservoir to a 0 $\degree$ C block of ice. How much ice is melted per second? (For silver, k = 427 W / m · $\degree$ C. For ice, L_f = 334,000 J/kg.)

A steel wire, 100 m long at 10 $\degree$ C, has a coefficient of linear expansion of 11*10 ^- ⁶/ $\degree$ C. Give its change in length as the temperature changes from 10 $\degree$ C to 45 $\degree$ C.