Question 1

Is it possible for a system to have negative potential energy?

Accepted Answer

A)  Yes, as long as the kinetic energy is positive. 
B)  Yes, as long as the total energy is positive. 
C)  Yes, since the choice of the zero of potential energy is arbitrary. 
D)  No, because the kinetic energy of a system must equal its potential energy. 
E)  No, because this would have no physical meaning. 
A)  Yes, as long as the kinetic energy is positive. 
B)  Yes, as long as the total energy is positive. 
C)  Yes, since the choice of the zero of potential energy is arbitrary. 
D)  No, because the kinetic energy of a system must equal its potential energy. 
E)  No, because this would have no physical meaning.

Question 2

On a smooth horizontal floor, an object slides into a spring which is attached to another mass that is initially stationary. When the spring is most compressed, both objects are moving at the same speed. Ignoring friction, what is conserved during this interaction?

Accepted Answer

A)  momentum and mechanical energy 
B)  momentum only 
C)  kinetic energy only 
D)  momentum and kinetic energy 
E)  momentum and potential energy 
A)  momentum and mechanical energy 
B)  momentum only 
C)  kinetic energy only 
D)  momentum and kinetic energy 
E)  momentum and potential energy

Question 3

You do 174 J of work while pulling your sister back on a swing, whose chain is 5.10 m long. You start with the swing hanging vertically and pull it until the chain makes an angle of 32.0° with the vertical with your sister is at rest. What is your sister's mass, assuming negligible friction?

Accepted Answer

A)  22.9 kg 
B)  19.5 kg 
C)  26.3 kg 
D)  28.4 kg 
A)  22.9 kg 
B)  19.5 kg 
C)  26.3 kg 
D)  28.4 kg

Exam 10: Energy

Is it possible for a system to have negative potential energy?

On a smooth horizontal floor, an object slides into a spring which is attached to another mass that is initially stationary. When the spring is most compressed, both objects are moving at the same speed. Ignoring friction, what is conserved during this interaction?

You do 174 J of work while pulling your sister back on a swing, whose chain is 5.10 m long. You start with the swing hanging vertically and pull it until the chain makes an angle of 32.0° with the vertical with your sister is at rest. What is your sister's mass, assuming negligible friction?

Concepts of Motion

Kinematics in One Dimension

Vectors and Coordinate Systems

Kinematics in Two Dimensions

Force and Motion

Dynamics I: Motion Along a Line

Newtons Third Law

Dynamics Ii: Motion in a Plane

Impulse and Momentum

Work

Rotation of a Rigid Body

Newtons Theory of Gravity

Oscillations

Fluids and Elasticity

A Macroscopic Description of Matter

Work, Heat, and the First Law of Thermodynamics

The Micromacro Connection

Heat Engines and Refrigerators

Traveling Waves

Superpositions

Wave Optics

Ray Optics

Optical Instruments

Electric Charges and Forces

The Electric Field

Gausss Law

The Electric Potential

Potential and Field

Current and Resistance

Fundamentals of Circuits

The Magnetic Field

Electromagnetic Induction

Electromagnetic Fields and Waves

Ac Circuits

Relativity

The Foundations of Modern Physics

Quantization

Wave Functions and Uncertainty

One-Dimensional Quantum Mechanics

Atomic Physics

Nuclear Physics

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