Question 1

Which object will emit more electromagnetic radiation than it absorbs from its surroundings?

Accepted Answer

A) a 600 °C copper sphere in a 700 °C oven 
B) a girl scout sitting close to a campfire 
C) an ice cube in beaker of water at 50 °C 
D) a 200 °C copper coin in a beaker of water at 98 °C 
E) an ice cube in thermal equilibrium with the interior of a freezer 
A) a 600 °C copper sphere in a 700 °C oven 
B) a girl scout sitting close to a campfire 
C) an ice cube in beaker of water at 50 °C 
D) a 200 °C copper coin in a beaker of water at 98 °C 
E) an ice cube in thermal equilibrium with the interior of a freezer

Question 2

Two bars, A and B, each of length 2.0 m and cross sectional area 1.0 mS1U1P12S1S1P0, are placed end to end as shown in the figure.   The thermal conductivities of the bars are
kS1U1B1AS1U1B0 = 439 J/(s . m . K) and kS1U1B1BS1U1B0 = 887 J/(s . m . K), respectively. The left end of bar A is maintained at 373 K while the right end of B is maintained at 273 K.
-What is the rate of heat transfer through this combination?

Accepted Answer

A) 3.7 × 103 J/s 
B) 6.4 × 103 J/s 
C) 8.8 × 103 J/s 
D) 1.5 × 104 J/s 
E) 2.2 × 104 J/s 
A) 3.7 × 103 J/s 
B) 6.4 × 103 J/s 
C) 8.8 × 103 J/s 
D) 1.5 × 104 J/s 
E) 2.2 × 104 J/s

Which object will emit more electromagnetic radiation than it absorbs from its surroundings?

Introduction and Mathematical Concepts

Kinematics in One Dimension

Kinematics in Two Dimensions

Forces and Newtons Laws of Motion

Dynamics of Uniform Circular Motion

Work and Energy

Impulse and Momentum

Rotational Kinematics

Rotational Dynamics

Simple Harmonic Motion and Elasticity

Fluids

Temperature and Heat

The Ideal Gas Law and Kinetic Theory

Thermodynamics

Waves and Sound

The Principle of Linear Superposition and Interference Phenomena

Electric Forces and Electric Fields

Electric Potential Energy and the Electric Potential

Electric Circuits

Magnetic Forces and Magnetic Fields

Electromagnetic Induction

Alternating Current Circuits

Electromagnetic Waves

The Refl Ection of Light: Mirrors

The Refraction of Light: Lenses and Optical Instruments

Interference and the Wave Nature of Light

Special Relativity

Particles and Waves

The Nature of the Atom

Nuclear Physics and Radioactivity

Ionizing Radiation, Nuclear Energy, and Elementary Particles

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Exam 13: The Transfer of Heat

Which object will emit more electromagnetic radiation than it absorbs from its surroundings?

Introduction and Mathematical Concepts

Kinematics in One Dimension

Kinematics in Two Dimensions

Forces and Newtons Laws of Motion

Dynamics of Uniform Circular Motion

Work and Energy

Impulse and Momentum

Rotational Kinematics

Rotational Dynamics

Simple Harmonic Motion and Elasticity

Fluids

Temperature and Heat

The Ideal Gas Law and Kinetic Theory

Thermodynamics

Waves and Sound

The Principle of Linear Superposition and Interference Phenomena

Electric Forces and Electric Fields

Electric Potential Energy and the Electric Potential

Electric Circuits

Magnetic Forces and Magnetic Fields

Electromagnetic Induction

Alternating Current Circuits

Electromagnetic Waves

The Refl Ection of Light: Mirrors

The Refraction of Light: Lenses and Optical Instruments

Interference and the Wave Nature of Light

Special Relativity

Particles and Waves

The Nature of the Atom

Nuclear Physics and Radioactivity

Ionizing Radiation, Nuclear Energy, and Elementary Particles

Filters