Question 1

A puddle holds 150 g of water.If 0.75 g of water evaporates from the surface,what is the approximate temperature change of the remaining water? (Lv = 540 cal/g)

Accepted Answer

A)  -2.7°C 
B)  +2.7°C 
C)  −0.27°C 
D)  +0.27°C 
A)  -2.7°C 
B)  +2.7°C 
C)  −0.27°C 
D)  +0.27°C A

Question 2

A 6-g lead bullet traveling in 20°C air at 300 m/s strikes a flat steel plate and stops.What is the final temperature of the lead bullet? (Assume the bullet retains all heat. )The melting point of lead is 327°C.The specific heat of lead is 0.128 J/g·°C.The heat of fusion of lead is 24.5 J/g.

Accepted Answer

A)  227°C 
B)  260°C 
C)  293°C 
D)  327°C 
A)  227°C 
B)  260°C 
C)  293°C 
D)  327°C D

Question 3

At high noon,the Sun delivers 900 W to each square meter of a blacktop road.What is the equilibrium temperature of the asphalt,assuming its emissivity e = 1? (σ = 5.67 × 10−8 W/m2×K4).

Accepted Answer

A)  75°C 
B)  82°C 
C)  91°C 
D)  99°C 
A)  75°C 
B)  82°C 
C)  91°C 
D)  99°C B

Question 4

A steel wire,100 m long at 10°C,has a coefficient of linear expansion of 11 × 10−6/°C.Give its change in length as the temperature changes from 10°C to 45°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 5

A swimming pool heater has to be able to raise the temperature of the 30,000 gallons of water in the pool by 10.0°C.How many kilowatt-hours of energy are required? (One gallon of water has a mass of approximately 3.79 kg and the specific heat of water is 4186 J/kg · °C. )

Accepted Answer

A)  1960 kWh 
B)  1320 kWh 
C)  1130 kWh 
D)  216 kWh 
A)  1960 kWh 
B)  1320 kWh 
C)  1130 kWh 
D)  216 kWh

Question 6

As a copper wire is heated,its length increases by 0.200%.What is the change of the temperature of the wire? (αCu = 16.6 × 10−6/C°)

Accepted Answer

A)  120°C 
B)  60.2°C 
C)  30.1°C 
D)  6.0°C 
A)  120°C 
B)  60.2°C 
C)  30.1°C 
D)  6.0°C

Question 7

How much heat energy must be removed from 150 g of oxygen at 22°C to liquefy it at −183°C? (The specific heat of oxygen gas is 0.218 cal/g·°C,and its heat of vaporization is 50.9 cal/g. )

Accepted Answer

A)  14,300 cal 
B)  9560 cal 
C)  4320 cal 
D)  2160 cal 
A)  14,300 cal 
B)  9560 cal 
C)  4320 cal 
D)  2160 cal

Question 8

Carly places one end of a steel bar in a Bunsen flame and the other end in an ice cube.By what factor is the rate of heat flow changed when the bar's cross-sectional area is tripled?

Accepted Answer

A)  0.33 
B)  1/9 
C)  3.0 
D)  9.0 
A)  0.33 
B)  1/9 
C)  3.0 
D)  9.0

Question 9

A solar heating system has a 25.0% conversion efficiency;the solar radiation incident on the panels is 1000 W/m2.What is the increase in temperature of 40.0-kg of water in a 1.00-h period by a 4.00 m2 area collector? (cw = 4186 J/kg · °C)

Accepted Answer

A)  14.3°C 
B)  21.5°C 
C)  28.7°C 
D)  44.3°C 
A)  14.3°C 
B)  21.5°C 
C)  28.7°C 
D)  44.3°C

Question 10

A 3.00 g lead bullet is traveling at a speed of 300 m/s when it embeds in a wood post.If we assume that half of the resultant heat energy generated remains with the bullet,what is the increase in temperature of the embedded bullet? (specific heat of lead = 0.0305 kcal/kg· °C,1 kcal = 4186 J)

Accepted Answer

A)  113°C 
B)  137°C 
C)  176°C 
D)  259°C 
A)  113°C 
B)  137°C 
C)  176°C 
D)  259°C

Question 11

A substance is heated from 15°C to 45°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 12

A piece of copper of mass 100 g is being drilled through with a 1/2" electric drill.The drill operates at 50.0 W and takes 30.0 s to bore through the copper.If all the energy from the drill heats the copper,find the copper's increase in temperature.(ccopper = 387 J/kg · °C. )

Accepted Answer

A)  40.6°C 
B)  38.8°C 
C)  31.0°C 
D)  27.3°C 
A)  40.6°C 
B)  38.8°C 
C)  31.0°C 
D)  27.3°C

Question 13

The inside of a house is at 20°C on an early morning when the temperature outside is 15°C.The next morning the inside temperature is the same,but the outside temperature is now 5°C.How much does the energy per unit time lost by conduction through the walls,windows,doors,etc. ,change for the house from the first morning to the second one.

Accepted Answer

A)  Since the inside temperature stays the same,the loss is the same both days. 
B)  The loss reduces to 1/3. 
C)  The loss triples. 
D)  The loss increases by 5/278 since we need to use the Kelvin scale for this calculation. 
A)  Since the inside temperature stays the same,the loss is the same both days. 
B)  The loss reduces to 1/3. 
C)  The loss triples. 
D)  The loss increases by 5/278 since we need to use the Kelvin scale for this calculation.

Question 14

A windowpane is half a centimeter thick and has an area of 2.0 m2.The temperature difference between the inside and outside surfaces of the pane is 15°C.What is the rate of heat flow through this window? (Thermal conductivity for this glass is 0.84 W / m ·°C. )

Accepted Answer

A)  5000 J/s 
B)  2500 J/s 
C)  1300 J/s 
D)  630 J/s 
A)  5000 J/s 
B)  2500 J/s 
C)  1300 J/s 
D)  630 J/s

Question 15

A long steel beam has a length of fifty meters on a cold day when the temperature is 0°C.What is the length of the beam on a hot day when T = 40°C? (αsteel= 1.1 × 10−5/°C)

Accepted Answer

A)  50.044 m 
B)  50.022 m 
C)  50.088 m 
D)  50.0044 m 
A)  50.044 m 
B)  50.022 m 
C)  50.088 m 
D)  50.0044 m

Question 16

In the text there is a table of coefficients of linear (α)and volume (β)expansions due to temperature changes.For the solid materials in this list,there is a relationship between α and β which allows you to find the value of β if you know α.Which of the following best describes that relationship?

Accepted Answer

A)  α = β3 
B)  3α = β 
C)  α = 3β 
D)  α3 = β 
A)  α = β3 
B)  3α = β 
C)  α = 3β 
D)  α3 = β

Question 17

Marc attaches a falling 250-kg object with a rope through a pulley to a paddle wheel shaft.He places the system in a well-insulated tank holding 12 kg of water.When the object falls,it causes the paddle wheel to rotate and churn the water.If the object falls a vertical distance of 100 m at constant speed,what is the temperature change of the water? (1 kcal = 4186 J,the specific heat of water is 4186 J/kg · °C,and g = 9.8 m/s2)

Accepted Answer

A)  19,600°C 
B)  4700°C 
C)  4.9°C 
D)  2.3°C 
A)  19,600°C 
B)  4700°C 
C)  4.9°C 
D)  2.3°C

Question 18

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°C to 90°C? (1 cal = 4.186 J,the specific heat of water is 4 186 J/kg · °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 19

A 0.2-kg aluminum plate,initially at 20°C,slides down a 10-m long surface,inclined at a 30° angle to the horizontal.The force of kinetic friction exactly balances the component of gravity down the plane so that the plate,once started,glides down at constant velocity.If 90% of the mechanical energy of the system is absorbed by the aluminum,what is its temperature increase at the bottom of the incline? (Specific heat for aluminum is 900 J/kg · °C. )

Accepted Answer

A)  0.16°C 
B)  0.07°C 
C)  0.05°C 
D)  0.03°C 
A)  0.16°C 
B)  0.07°C 
C)  0.05°C 
D)  0.03°C

Question 20

An automobile gas tank is filled to its capacity of 20.00 gallons with the gasoline at an initial temperature of 10°C.The automobile is parked in the Sun causing the gasoline's temperature to rise to 60°C.If the coefficient of volume expansion for gasoline is 9.6 × 10−4/°C,what volume runs out the overflow tube? Assume the change in volume of the tank is negligible.

Accepted Answer

A)  1.74 gallons 
B)  0.96 gallon 
C)  0.72 gallon 
D)  0.30 gallon 
A)  1.74 gallons 
B)  0.96 gallon 
C)  0.72 gallon 
D)  0.30 gallon

Exam 14: Sound: Part A

A puddle holds 150 g of water.If 0.75 g of water evaporates from the surface,what is the approximate temperature change of the remaining water? (Lv = 540 cal/g)

A 6-g lead bullet traveling in 20°C air at 300 m/s strikes a flat steel plate and stops.What is the final temperature of the lead bullet? (Assume the bullet retains all heat. )The melting point of lead is 327°C.The specific heat of lead is 0.128 J/g·°C.The heat of fusion of lead is 24.5 J/g.

At high noon,the Sun delivers 900 W to each square meter of a blacktop road.What is the equilibrium temperature of the asphalt,assuming its emissivity e = 1? (σ = 5.67 × 10−8 W/m2×K4).

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

A swimming pool heater has to be able to raise the temperature of the 30,000 gallons of water in the pool by 10.0°C.How many kilowatt-hours of energy are required? (One gallon of water has a mass of approximately 3.79 kg and the specific heat of water is 4186 J/kg · °C. )

As a copper wire is heated,its length increases by 0.200%.What is the change of the temperature of the wire? (αCu = 16.6 × 10−6/C°)

How much heat energy must be removed from 150 g of oxygen at 22°C to liquefy it at −183°C? (The specific heat of oxygen gas is 0.218 cal/g·°C,and its heat of vaporization is 50.9 cal/g. )

Carly places one end of a steel bar in a Bunsen flame and the other end in an ice cube.By what factor is the rate of heat flow changed when the bar's cross-sectional area is tripled?

A solar heating system has a 25.0% conversion efficiency;the solar radiation incident on the panels is 1000 W/m2.What is the increase in temperature of 40.0-kg of water in a 1.00-h period by a 4.00 m2 area collector? (cw = 4186 J/kg · °C)

A 3.00 g lead bullet is traveling at a speed of 300 m/s when it embeds in a wood post.If we assume that half of the resultant heat energy generated remains with the bullet,what is the increase in temperature of the embedded bullet? (specific heat of lead = 0.0305 kcal/kg· °C,1 kcal = 4186 J)

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

A piece of copper of mass 100 g is being drilled through with a 1/2" electric drill.The drill operates at 50.0 W and takes 30.0 s to bore through the copper.If all the energy from the drill heats the copper,find the copper's increase in temperature.(ccopper = 387 J/kg · °C. )

A windowpane is half a centimeter thick and has an area of 2.0 m2.The temperature difference between the inside and outside surfaces of the pane is 15°C.What is the rate of heat flow through this window? (Thermal conductivity for this glass is 0.84 W / m ·°C. )

A long steel beam has a length of fifty meters on a cold day when the temperature is 0°C.What is the length of the beam on a hot day when T = 40°C? (αsteel= 1.1 × 10−5/°C)

Introduction

Introduction: Part A

Motion in One Dimension

Motion in One Dimension: Part A

Vectors and Two-Dimensional Motion

Vectors and Two-Dimensional Motion: Part A

The Laws of Motion

The Laws of Motion: Part A

Energy

Energy: Part A

Momentum and Collisions

Momentum and Collisions: Part A

Rotational Motion and the Law of Gravity

Rotational Motion and the Law of Gravity: Part A

Rotational Equilibrium and Rotational Dynamics

Rotational Equilibrium and Rotational Dynamics: Part A

Solids and Fluids

Solids and Fluids: Part A

Thermal Physics

Thermal Physics: Part A

Energy in Thermal Processes Heat and Internal Energy

Energy in Thermal Processes Heat and Internal Energy: Part A

The Laws of Thermodynamics Work in Thermodynamic Processes

The Laws of Thermodynamics Work in Thermodynamic Processes: Part A

Vibrations and Waves

Vibrations and Waves: Part A

Sound

Electric Forces and Electric Fields

Electric Forces and Electric Fields: Part A

Electrical Energy and Capacitance

Electrical Energy and Capacitance: Part A

Current and Resistance Electric Current

Current and Resistance Electric Current: Part A

Direct-Current Circuits Sources of EMF

Direct-Current Circuits Sources of EMF: Part A

Magnetism Magnets

Magnetism Magnets: Part A

Induced Voltages and Inductance

Induced Voltages and Inductance: Part A

Alternating-Current Circuits and Electromagnetic Waves

Alternating-Current Circuits and Electromagnetic Waves: Part A

Reflection and Refraction of Light

Reflection and Refraction of Light: Part A

Mirrors and Lenses

Mirrors and Lenses: Part A

Wave Optics

Wave Optics: Part A

Optical Instruments

Optical Instruments: Part A

Relativity

Relativity: Part A

Quantum Physics Blackbody Radiation and Plancks Hypothesis

Quantum Physics Blackbody Radiation and Plancks Hypothesis: Part A

Atomic Physics

Atomic Physics: Part A

Nuclear Physics

Nuclear Physics: Part A

Nuclear Energy and Elementary Particles

Nuclear Energy and Elementary Particles: Part A

Particle Collisions, Mediating Photons, and Quark Structures: Exploring the Fundamentals of Physics

Filters

A puddle holds 150 g of water.If 0.75 g of water evaporates from the surface,what is the approximate temperature change of the remaining water? (L_v = 540 cal/g)

At high noon,the Sun delivers 900 W to each square meter of a blacktop road.What is the equilibrium temperature of the asphalt,assuming its emissivity e = 1? (σ = 5.67 × 10−⁸ W/m²×K⁴).

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

As a copper wire is heated,its length increases by 0.200%.What is the change of the temperature of the wire? (α_Cu = 16.6 × 10−⁶/C°)

A solar heating system has a 25.0% conversion efficiency;the solar radiation incident on the panels is 1000 W/m².What is the increase in temperature of 40.0-kg of water in a 1.00-h period by a 4.00 m² area collector? (c_w = 4186 J/kg · °C)

A piece of copper of mass 100 g is being drilled through with a ¹/₂" electric drill.The drill operates at 50.0 W and takes 30.0 s to bore through the copper.If all the energy from the drill heats the copper,find the copper's increase in temperature.(c_copper = 387 J/kg · °C. )

A windowpane is half a centimeter thick and has an area of 2.0 m².The temperature difference between the inside and outside surfaces of the pane is 15°C.What is the rate of heat flow through this window? (Thermal conductivity for this glass is 0.84 W / m ·°C. )

A long steel beam has a length of fifty meters on a cold day when the temperature is 0°C.What is the length of the beam on a hot day when T = 40°C? (α_steel= 1.1 × 10−⁵/°C)