The tungsten filament of a light bulb has an operating temperature of about 2100 K.If the emitting area of the filament is 0.80 cm2,and its emissivity is 0.68,what is the power output of the light bulb? (σ = 5.67 × 10−8 W/m2 · K4)

A) 100 W B) 75 W C) 60 W D) 40 W A) 100 W B) 75 W C) 60 W D) 40 W

I place a 250-g ice cube (initially at 0°C)in a Styrofoam box with wall thickness 1.0 cm and total surface area 600 cm2.If the air surrounding the box is at 20°C and after 2 hours the ice is completely melted,what is the conductivity of the Styrofoam material? (Lf = 80 cal/g)

A) 9.6 × 10−5 B) 2.8 × 10−6 C) 1.15 × 10−2 D) 2.3 × 10−4 A) 9.6 × 10−5 B) 2.8 × 10−6 C) 1.15 × 10−2 D) 2.3 × 10−4

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

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

Exam 14: Sound: Part A

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The Sun is a slightly variable star.What if the surface temperature of the Sun were to increase from 6000 K to 6100 K,what would be the increase in total power radiated assuming no other changes such as radius or emissivity?

(Multiple Choice)

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Question 41

A 0.0030-kg lead bullet is traveling at a speed of 300 m/s when it embeds in a block of ice at 0°C.If all the heat generated goes into melting ice,what quantity of ice is melted? (L_f = 80 kcal/kg,the specific heat of lead = 0.03 kcal/kg·°C,and 1 kcal = 4186 J)

(Multiple Choice)

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Question 42

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.

(Multiple Choice)

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Question 43

The filament temperature of a light bulb is 2000 K when the bulb delivers 50 W of power.If its emissivity remains constant,what power is delivered when the filament temperature is 2500 K?

(Multiple Choice)

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Question 44

A 50-g cube of ice,initially at 0.0°C,is dropped into 200 g of water in an 80-g aluminum container,both initially at 40°C.What is the final equilibrium temperature? (Specific heat for aluminum is 900 J/kg·°C,the specific heat of water is 4186 J/kg·°C,and L_f = 3.33 × 10⁵ J/kg. )

(Multiple Choice)

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Question 45

An object at 27°C has its temperature increased to 47°C.The power then radiated by this object increases by how many percent?

(Multiple Choice)

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Question 46

A 100-g block of copper is taken from a kiln and quickly placed into a beaker of negligible heat capacity containing 300 g of water.The water temperature rises from 15°C to 40°C.Given c_Cu = 0.10 cal/g·°C,and c_water = 1.00 cal/g·°C,what was the temperature of the kiln?

(Multiple Choice)

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Question 47

What is the temperature increase of 3.0 kg of water when heated by an 800-W immersion heater for 10 min? (c_w = 4186 J/kg · °C)

(Multiple Choice)

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Question 48

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

(Multiple Choice)

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Question 49

The tungsten filament of a light bulb has an operating temperature of about 2100 K.If the emitting area of the filament is 0.80 cm²,and its emissivity is 0.68,what is the power output of the light bulb? (σ = 5.67 × 10−⁸ W/m² · K⁴)

(Multiple Choice)

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(74)

Question 50

Two stars,A and B,have the same emissivity,but the radii and surface temperatures are different with R_A = 2 R_B,and T_A = 0.5 T_B.Assuming the temperature of space to be negligible,which star radiates the most energy per unit time?

(Multiple Choice)

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Question 51

Suppose working outside on a hot day someone generate 450 J of heat each second.If this energy is compensated for by the evaporation of sweat,how much water would be lost in an hour? The latent heat of fusion for water is 334 kJ/kg and for vaporization is 2,200 kJ/kg.

(Multiple Choice)

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Question 52

I take 2.0 kg of ice and dump it into 1.0 kg of water and,when equilibrium is reached,I have 3.0 kg of ice at 0°C.The water was originally at 0°C.The specific heat of water = 1.00 kcal/kg·°C,the specific heat of ice = 0.50 kcal/kg·°C,and the latent heat of fusion of water is 80 kcal/kg.The original temperature of the ice was:

(Multiple Choice)

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Question 53

I place a 250-g ice cube (initially at 0°C)in a Styrofoam box with wall thickness 1.0 cm and total surface area 600 cm².If the air surrounding the box is at 20°C and after 2 hours the ice is completely melted,what is the conductivity of the Styrofoam material? (L_f = 80 cal/g)

(Multiple Choice)

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Question 54

Arrange the temperatures 40 ºF,40 ºC,and 40 K from highest to lowest.

(Multiple Choice)

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Question 55

A metal bar is used to conduct heat.When the temperature at one end is 100°C and at the other is 20°C,heat is transferred at a rate of 32 J/s.The bar is then stretched uniformly to twice its original length.If again it has ends at 100°C and 20°C,at what rate will heat be transferred between it ends?

(Multiple Choice)

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Question 56

A slice of bread contains about 90 kcal.If specific heat of a person were 1.00 kcal/kg·°C,by how many °C would the temperature of a 70.0-kg person increase if all the energy in the bread were converted to heat?

(Multiple Choice)

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Question 57

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

(Multiple Choice)

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Question 58

What temperature increase is necessary to increase the power radiated from an object by a factor of 16?

(Multiple Choice)

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Question 59

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

(Multiple Choice)

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Question 60

Showing 41 - 60 of 67

Exam 14: Sound: Part A

The Sun is a slightly variable star.What if the surface temperature of the Sun were to increase from 6000 K to 6100 K,what would be the increase in total power radiated assuming no other changes such as radius or emissivity?

A 0.0030-kg lead bullet is traveling at a speed of 300 m/s when it embeds in a block of ice at 0°C.If all the heat generated goes into melting ice,what quantity of ice is melted? (Lf = 80 kcal/kg,the specific heat of lead = 0.03 kcal/kg·°C,and 1 kcal = 4186 J)

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.

The filament temperature of a light bulb is 2000 K when the bulb delivers 50 W of power.If its emissivity remains constant,what power is delivered when the filament temperature is 2500 K?

A 50-g cube of ice,initially at 0.0°C,is dropped into 200 g of water in an 80-g aluminum container,both initially at 40°C.What is the final equilibrium temperature? (Specific heat for aluminum is 900 J/kg·°C,the specific heat of water is 4186 J/kg·°C,and Lf = 3.33 × 105 J/kg. )

An object at 27°C has its temperature increased to 47°C.The power then radiated by this object increases by how many percent?

A 100-g block of copper is taken from a kiln and quickly placed into a beaker of negligible heat capacity containing 300 g of water.The water temperature rises from 15°C to 40°C.Given cCu = 0.10 cal/g·°C,and cwater = 1.00 cal/g·°C,what was the temperature of the kiln?

What is the temperature increase of 3.0 kg of water when heated by an 800-W immersion heater for 10 min? (cw = 4186 J/kg · °C)

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

The tungsten filament of a light bulb has an operating temperature of about 2100 K.If the emitting area of the filament is 0.80 cm2,and its emissivity is 0.68,what is the power output of the light bulb? (σ = 5.67 × 10−8 W/m2 · K4)

Two stars,A and B,have the same emissivity,but the radii and surface temperatures are different with RA = 2 RB,and TA = 0.5 TB.Assuming the temperature of space to be negligible,which star radiates the most energy per unit time?

Suppose working outside on a hot day someone generate 450 J of heat each second.If this energy is compensated for by the evaporation of sweat,how much water would be lost in an hour? The latent heat of fusion for water is 334 kJ/kg and for vaporization is 2,200 kJ/kg.

I place a 250-g ice cube (initially at 0°C)in a Styrofoam box with wall thickness 1.0 cm and total surface area 600 cm2.If the air surrounding the box is at 20°C and after 2 hours the ice is completely melted,what is the conductivity of the Styrofoam material? (Lf = 80 cal/g)

Arrange the temperatures 40 ºF,40 ºC,and 40 K from highest to lowest.

A slice of bread contains about 90 kcal.If specific heat of a person were 1.00 kcal/kg·°C,by how many °C would the temperature of a 70.0-kg person increase if all the energy in the bread were converted to heat?

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

What temperature increase is necessary to increase the power radiated from an object by a factor of 16?

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 0.0030-kg lead bullet is traveling at a speed of 300 m/s when it embeds in a block of ice at 0°C.If all the heat generated goes into melting ice,what quantity of ice is melted? (L_f = 80 kcal/kg,the specific heat of lead = 0.03 kcal/kg·°C,and 1 kcal = 4186 J)

A 50-g cube of ice,initially at 0.0°C,is dropped into 200 g of water in an 80-g aluminum container,both initially at 40°C.What is the final equilibrium temperature? (Specific heat for aluminum is 900 J/kg·°C,the specific heat of water is 4186 J/kg·°C,and L_f = 3.33 × 10⁵ J/kg. )

A 100-g block of copper is taken from a kiln and quickly placed into a beaker of negligible heat capacity containing 300 g of water.The water temperature rises from 15°C to 40°C.Given c_Cu = 0.10 cal/g·°C,and c_water = 1.00 cal/g·°C,what was the temperature of the kiln?

What is the temperature increase of 3.0 kg of water when heated by an 800-W immersion heater for 10 min? (c_w = 4186 J/kg · °C)

The tungsten filament of a light bulb has an operating temperature of about 2100 K.If the emitting area of the filament is 0.80 cm²,and its emissivity is 0.68,what is the power output of the light bulb? (σ = 5.67 × 10−⁸ W/m² · K⁴)

Two stars,A and B,have the same emissivity,but the radii and surface temperatures are different with R_A = 2 R_B,and T_A = 0.5 T_B.Assuming the temperature of space to be negligible,which star radiates the most energy per unit time?

I place a 250-g ice cube (initially at 0°C)in a Styrofoam box with wall thickness 1.0 cm and total surface area 600 cm².If the air surrounding the box is at 20°C and after 2 hours the ice is completely melted,what is the conductivity of the Styrofoam material? (L_f = 80 cal/g)

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