ppt_chapter07.ppt - Raymond A Serway John W Jewett Chapter 7 Conservation of Energy 7.1 Analysis Model Nonisolated System(Energy • In a nonisolated

ppt_chapter07.ppt - Raymond A Serway John W Jewett Chapter...

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Raymond A. Serway John W. Jewett Chapter 7 Conservation of Energy
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7.1 Analysis Model: Nonisolated System (Energy) In a nonisolated system: Energy crosses boundary of the system due to interaction with the environment For example, the work-kinetic energy theorem: Interaction of system with environment is work done by external force Quantity in system that changes is kinetic energy
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7.1 Analysis Model: Nonisolated System (Energy) Methods of energy transfer: Work : transfers energy by applying a force and causing a displacement of the point of application of the force Mechanical Waves : allow a disturbance to propagate through a medium Heat : is driven by a temperature difference between two regions in space
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7.1 Analysis Model: Nonisolated System (Energy) Matter Transfer : matter physically crosses the boundary of the system, carrying energy with it Electrical Transmission : transfer is by electric current Electromagnetic Radiation : energy is transferred by electromagnetic waves
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7.1 Analysis Model: Nonisolated System (Energy)
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7.1 Analysis Model: Nonisolated System (Energy) Energy is conserved This means that energy cannot be created or destroyed If the total amount of energy in a system changes, it can only be due to the fact that energy has crossed the boundary of the system by some method of energy transfer
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7.1 Analysis Model: Nonisolated System (Energy) Mathematically, E system = E system is the total energy of the system T is the energy transferred across the system boundary Note: T work = W and T heat = Q Others do not have standard symbols, so we use: T MW (mechanical waves) T MT (matter transfer) T ET (electrical transmission) T ER (electromagnetic radiation)
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7.1 Analysis Model: Nonisolated System (Energy) The primary mathematical representation of the energy analysis of a nonisolated system is If any of the terms on the right are zero, the system is an isolated system The Work-Kinetic Energy Theorem ( K = W ) is a special case of the more general equation above
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7.2 Analysis Model: Isolated System (Energy) Isolated system: no energy crosses the system boundary by any method Example: lifting a book in a gravitational field System consists of the book and the Earth Mechanical energy: System is isolated, so Mechanical energy is conserved for isolated system with no noncosernvative forces acting
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Problem-Solving Strategy: Isolated System with No Noncoservative Forces: Conservation of Mechanical Energy 1. Conceptualize - Study the physical situation carefully and form a mental representation of what is happening. As you become more proficient working energy problems, you will begin to be comfortable imagining the types of energy that are changing in the system.
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Problem-Solving Strategy: Isolated System with No Noncoservative Forces: Conservation of Mechanical Energy 2. Categorize - Define your system, which may consist of more than one object and may or
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