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Power is defined as the rate at which work is done or energy is converted from one form to another. The principles of conservation of energy and conservation of mechanical energy state that energy cannot be created or destroyed, only transformed between different forms, and the total mechanical energy in a system, including both kinetic and potential energy, remains constant when there are no dissipative forces acting. Examples include how the total mechanical energy of an object moving up or down in a gravitational field remains the same.
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4) The principle of conservation of energy - that energy cannot be created or destroyed in an isolated system, only transferred.
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Energy can exist in various forms and undergo transformations between forms while obeying the laws of conservation of energy. It is defined as the ability to do work and is measured in joules. The main forms of energy include chemical, electrical, heat/thermal, light/radiant, mechanical, and nuclear energy. Energy can also be categorized as either potential or kinetic energy. Equations express the conservation of mechanical energy and how potential and kinetic energy can be calculated and transformed between objects and systems while the total energy remains constant. Energy is used in various ways including as light, heat, to power growth/movement of living things, and to run machines by converting one form of energy to another.
Physicspppppppppt
This PowerPoint presentation covers key concepts of energy in physics. It defines energy as a quantitative property describing a physical system's state, and explains that energy can be transformed and measured in joules. It then discusses kinetic energy as the energy from an object's motion, defined as the work needed to accelerate a mass from rest to a velocity. Potential energy is defined as energy stored in forcefully interacting systems, associated with position-dependent forces. The presentation concludes that the total energy of a system is the sum of its potential and kinetic energies, and applies the law of conservation of energy to an example of an object falling from rest under gravity.
Power and energy
Here in this presentation, I have tried to input all the basic and simple concept of Power and Energy. It might be helpful for all. Thank you, everybody.
basic_thermodynamics.pdf
This document provides an overview of a series of lectures on basic chemical thermodynamics. It discusses the following key points:
- The lectures will cover topics including the first and second laws of thermodynamics, entropy, free energy, and determining thermodynamic functions.
- Thermodynamics allows the study of energy distribution in systems and how energy is needed or released during changes between systems.
- Standard states and conditions provide reference points for comparing systems. Biological standard conditions are also defined.
- The second law of thermodynamics introduces the concept of entropy as a measure of unavailable work energy or randomness in a system. Gibbs free energy can be used to determine the spontaneity of reactions.
basic_thermodynamics.pdf
This document provides an overview of a series of lectures on basic chemical thermodynamics. It discusses the following key points in 3 sentences:
The lectures will cover the first and second laws of thermodynamics, entropy, free energy, and determining thermodynamic functions. Recommended textbooks on physical chemistry and biochemistry are listed for further reading. The document then discusses constraints on biological systems imposed by physics and chemistry, defining thermodynamics as the study of heat and work, and covering basic concepts like standard states, types of systems, state functions, and the first law of thermodynamics.
Hp 05 Win
This presentation provides instructions on how to view and navigate through a slideshow. It explains that clicking "View" and then "Slide Show" will start the presentation. Users can advance slides by clicking the right arrow or space bar. Clicking on resources from the resources slide will show presentations for those resources. Clicking lessons from the Chapter menu will go directly to those lessons. Users can exit by pressing Esc. The presentation then provides an outline of chapter content covering work, energy, conservation of energy, and power.
Physics Pp Presentation Ch 5
This presentation provides instructions on how to view and navigate through a slideshow. It outlines how to advance slides by clicking arrows or spacebar and how to access resources and lessons from menu screens. Users can exit the slideshow at any time by pressing the Esc key. The document then lists the chapter's objectives and content which includes defining work, kinetic and potential energy, conservation of energy, and power. Sample problems are provided to illustrate concepts.
Physics Chapter 5 Pp Presentation
This presentation provides instructions on how to view and navigate through a slideshow. It explains that clicking "View" and then "Slide Show" will start the presentation. Users can advance slides by clicking the right arrow or space bar. Clicking on resources from the resources slide will show presentations for those resources. Clicking lessons from the Chapter menu will go directly to those lessons. Users can exit at any time by pressing Esc. The presentation also contains sample problems, objectives, definitions, equations and multiple choice questions related to work, energy, power and conservation of energy.
Work Energy And Power
The document discusses various concepts related to work, energy and power including:
- Energy is the ability to do work and can take different forms like kinetic, potential, etc.
- Work is the transfer of energy due to a force over a distance. It is related to energy by work-energy theorems.
- Potential energy is the stored energy an object has due to its position or state. Gravitational and spring potential energy are discussed.
- The principle of conservation of energy states that the total energy in an isolated system remains constant.
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Work energy power 2 reading assignment -revision 2 physics
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More from Mr Patrick NIYISHAKA
Summary
This document discusses vectors, force systems, and moments of force. It provides examples of torques, moments, and the cross product as they relate to force vectors. It also uses a skateboard and a hinged rectangular platform suspended by a cable as examples to illustrate moments of force and bending stresses. The document aims to explain vectors with force systems and resultants, and how moments are calculated as both scalar and vector formulations. It concludes with a problem asking the reader to find the moment about each coordinate axis of the force exerted by a cable suspending a hinged platform.
3 summary
This document introduces the topic of distributed database systems. It discusses distributed data independence and transaction atomicity. It provides a real-life example of a travel company using a distributed database with branches around the world. It then gives a quiz to test understanding of distributed database definitions, types, and functionality.
2 ddb architecture
This document discusses distributed database architecture. It describes the advantages as improved processing power through distributed processing across multiple machines, removal of single point of failure, and easier expandability. The disadvantages include increased complexity, costs, security challenges, and difficulties with integrity control and standardization. Different architectures are shared-nothing, shared-disk, and shared-memory. Distributed databases are well-suited for applications involving multiple sites like manufacturing, military systems, and airline reservations.
1 ddb
1. The document discusses types of distributed databases and distributed database architecture. It describes distributed databases as collections of shared data distributed over a computer network. Distributed databases can be either homogeneous, with all sites using the same DBMS, or heterogeneous, with different sites using different DBMSs. A distributed DBMS manages the distributed database and aims to make the distribution transparent to users.
2 countermeasures
This document discusses various countermeasures for database security including authorization, authentication, backups, journalizing, encryption, RAID technology, user-defined procedures, and checkpoints. It also discusses responses to different types of database failures such as aborted transactions, incorrect data, system failures with the database intact, and total database destruction. The preferred and alternative recovery approaches are outlined for each failure scenario.
2 countermeasures
This document discusses various countermeasures for database security including authorization, authentication, backups, journalizing, encryption, RAID technology, user-defined procedures, and checkpoints. It also discusses responses to different types of database failures such as aborted transactions, incorrect data, system failures with the database intact, and total database destruction. The preferred and alternative recovery approaches are outlined for each failure scenario.
3 summary
The document discusses database security and authorization. It covers threats to data security like human error and theft. Authentication verifies users' identities while authorization grants access privileges. Encryption encodes data for safe access. The document provides examples of improper authorization in schools and banks. It also includes a quiz on database security and authorization topics.
1 db security
Database security aims to protect data from accidental or intentional harm through threats like human error, software/hardware failures, theft, and improper access. These threats can result in losses of privacy, secrecy, confidentiality, data integrity, and availability. Countermeasures and responses to database failures help increase database security against various threats.
4 summary
This document covers transaction processing concepts including:
- Typical OLTP environments and how to recover from failures
- The ACID properties of transactions including atomicity, consistency, isolation, and durability
- Transaction states like active, aborted, and committed
- Transactions as concurrency units and how they execute concurrently while maintaining serializability
- Quizzes to test understanding of transaction processing, ACID properties, transaction states, and ensuring consistency through synchronization
3 summary
This document discusses concurrency control techniques for managing concurrent execution of transactions. It provides an example of how concurrency control is needed when multiple passengers try to purchase the last remaining airline ticket. The document then covers topics like transaction serialization, pessimistic and optimistic concurrency control, locking techniques, and two-phase locking. It concludes with sample multiple choice questions about problems with concurrent transactions, methods for serialization, locking data items, and definitions of deadlock and concurrency control.
2 con control
This document discusses concurrency control techniques for databases, including pessimistic and optimistic concurrency control. It describes locking techniques used for synchronization, including binary locks, certify locks, and two-phase locking to ensure serializability. It also discusses problems that can occur with locking such as deadlocks and starvation.
1 con exe
This document discusses concurrency control and methods to ensure serializability when transactions execute concurrently in a database. It begins by describing three problems that can occur with concurrent transaction execution: lost updates, unrepeatable reads, and dirty reads. It then explains two methods for achieving serializability: multi-version concurrency control and timestamp ordering. Timestamp ordering assigns timestamps to transactions and data items and uses the timestamps to determine when transactions can read and write data items to prevent conflicts. The document also briefly mentions using concurrency control protocols that employ locking to serialize transaction access.
1 basic concepts
This document discusses transaction processing in online transaction processing (OLTP) environments. It covers typical OLTP environments like airline, banking, and trading systems. It also covers topics like transactions being atomic units of execution that must have ACID (atomicity, consistency, isolation, durability) properties and can be in different states during processing. Transactions are sequences of database operations that must generate a consistent database when applied to a consistent one.
2 recovery
The document discusses database recovery from failures. It explains that a DBMS uses techniques like logging transactions, periodic backups, and mirroring databases to restore the system to a consistent state if a failure occurs. There are two types of recovery - from transaction failures, where the DBMS undoes uncommitted transactions, and from catastrophic failures like disk or system crashes, where the entire database must be restored from a backup and the log is used to replay committed transactions. Proper recovery is needed to ensure transactions are fully committed or have no effect, and that the database remains in a consistent state.
3 transaction
The document discusses the ACID properties that transactions should possess:
1. Atomicity - Transactions are atomic units that are fully completed or not completed at all.
2. Consistency - Transactions preserve consistency by ensuring the database only transitions between valid states.
3. Isolation - The execution of one transaction is isolated and not interfered with by other concurrent transactions.
4. Durability - Committed transaction changes persist in the database and survive failures through logging and recovery.
3 summary
The document discusses query processing and optimization techniques. It provides an example of querying a database to find the name of the last member to borrow a book with the title "Zeus". There are several ways to structure the query, but some methods are more optimized than others. Query processing involves translating SQL queries into relational algebra operations, generating execution plans, and executing the queries. Query optimization examines multiple query plans to identify the most efficient plan to retrieve the required data.
1 query processing
The document discusses the process of query processing, which includes translating SQL queries into relational algebra, generating an evaluation plan, and executing the query. It provides examples of translating a SQL query into relational algebra expressions and generating an annotated evaluation plan specifying the detailed strategy for evaluating the query.
1 query processing
The document discusses the process of query processing, which includes translating SQL queries into relational algebra, generating an evaluation plan, and executing the query. It provides examples of translating a SQL query into relational algebra expressions and generating an annotated evaluation plan specifying the detailed strategy for evaluating the query.
2 optimization
The document discusses query optimization techniques used by database systems. It describes how a database catalog is used to estimate query execution costs. Alternative execution plans are enumerated using heuristic rules and the lowest cost plan is selected. Examples are provided of applying translation rules to optimize a query tree by pushing down select and project operations, avoiding Cartesian products, and reordering joins and selections. Cost estimation considers factors like I/O, memory usage, and computation to select a suboptimal but efficient execution plan.
2 collision
This document discusses collisions, center of mass, and impulse and momentum. It provides information on inelastic 2D collisions and notes that analyzing collisions using impulse and momentum is useful when solving for collisions between two bodies. It also defines center of mass as the point where all the mass of an object or system can be considered concentrated.
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2 power
- 1. POWER Definition: Power (P) is the rate of which work is done or the rate at which energy is converted from one form into another.
- 2. POWER Notes:
- 3. Principle of Conservation of Energy(PCE) Energy cannot be created or destroyed, it can only be transformed from one form into another one. Mass is regarded as a form of energy. Note: 1. An alternative statement is the total energy of an isolated system is constant. 2. Mass is regarded as a form of energy. This is the idea of massenergy equivalence
- 4. Principle of Conservation of Mechanical Energy(PCME) When a body moves up or down in a gravitational field the total Mechanical energy (TME = kinetic plus potential) is conserved once there are no dissimilative forces. Note: 1. Simply stated it means that if a body moves up or down between 2 levels in a gravitational field then:
- 5. Principle of Conservation of Mechanical Energy(PCME) Examples:
- 6. Principle of Conservation of Mechanical Energy(PCME) Examples: