1 equilbrium
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This document discusses a class on the equilibrium of force systems. The class will cover topics like moments of force systems, magnitudes and directions of moments, and reducing force and couple systems. It will also include examples from real life. The class will specifically lecture on the definition of equilibrium, conditions for equilibrium, systems of coplanar and non-coplanar forces, and graphical and mathematical conditions for equilibrium like the triangle law, polygonal law, and Lami's theorem.
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This document provides an overview of engineering mechanics, which is divided into statics and dynamics. Statics deals with forces acting on bodies at rest, while dynamics looks at forces on moving bodies and is further divided into kinetics (motion due to forces) and kinematics (motion without considering forces). Key concepts discussed include types of forces and systems of forces. Laws of forces such as the parallelogram, triangle, and polygon laws are introduced to determine resultant forces. Other topics covered are Lami's theorem on forces in equilibrium, the definition of moment of force, and the concept of a couple formed by two equal and opposite forces.
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To determine the resultant force acting at the top of the tower (point D), I would:
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this is my presentation of theory of machine subject. the topic of this presentation is static force analysis. In gujarat technological university mechanical engineering third year syllabus topic. there are many types of forces described in this ppt. and examples and domestic use.
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1) Coplanar concurrent forces are forces that act in the same plane and meet at a single point.
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http://www.transtutors.com/homework-help/mechanical-engineering/force-systems-and-analysis/law-of-polygon.aspx
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2) Rotational equilibrium - the sum of all torques acting on the object about any point must equal zero.
The document provides examples of forces acting on objects in equilibrium and sample problems to solve. It explains that if the net force on an object is nonzero, it will accelerate, but if
UNIT 1.PPTX
The document discusses the objectives and syllabus for the course AR7202 Mechanics of Structures I. It aims to make students aware of how structural resolutions are important in architectural design and teach basic properties of solids and sections. The syllabus covers principles of statics including types of forces, force systems, and equilibrium. It also addresses analysis of plane trusses, properties of cross-sections, elastic properties of solids, and elastic constants. The course aims to teach students to apply equilibrium concepts and understand material behavior under forces.
FORCE-1.pptx
Engineering mechanics deals with the study of forces and their effects on bodies at rest or in motion. It is divided into statics, which studies forces on bodies at rest, and dynamics, which studies forces on bodies in motion. Applied mechanics is further divided into kinetics, which considers forces and motion, and kinematics, which considers motion alone. Mechanics uses concepts like forces, moments, equilibrium, and motion. Forces are described by their magnitude, direction, line of action, and point of application. Systems of forces include concurrent, coplanar, and collinear forces. The graphical and analytical methods can be used to determine the resultant of a system of forces, including the triangle law, polygon law, and resolution of forces.
Similar to 1 equilbrium (20)
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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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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
ここ3000字までしか入らないけどタイトルの方がたくさん文字入ると思います。
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1 equilbrium
- 1. Week 4 EQUILIBRIUM OF FORCE SYSTEM : Objectivities of this class 1. Moments of force system 2. Magnitude and Direction of Moment 3. Reduction of Force and Couple system - Summary, Quiz, Real-life examples This class is lecturing in order of above objectivities.
- 2. EQUILIBRIUM OF FORCE SYSTEM : 1. Definition of Equilibrium 2. Conditions for Equilibrium COPLANAR AND NON COPLANAR FORCES: 1. System of Forces 2. Coplanar Forces 3. Non Coplanar Forces
- 3. 1. Equilibrium(concurrent coplanar) Force 1) Definition: If a system of forces acting on a body, keeps the body in a state of rest or in a state of uniform motion along a straight line. 2) Conditions for Equilibrium: If it satisfies the following two conditions: ι) ∑ Fx = 0; and ii) ∑ Fy = 0
- 4. 1. Equilibrium(concurrent coplanar) Force 3) Graphical Conditions for Equilibrium: Triangle Law: If three forces are in equilibrium, then, they form a closed triangle when represented in a Tip to Tail arrangement
- 5. 1. Equilibrium(concurrent coplanar) Force 3) Graphical Conditions for Equilibrium: Polygonal Law: If more than three forces are in equilibrium, then, they form a closed polygon when represented in a Tip to Tail arrangement
- 6. 1. Equilibrium(concurrent coplanar) Force 3) Graphical Conditions for Equilibrium: Lami’s Theorem : If a system of three forces is in equilibrium, then, each force of the system is proportional to sine of the angle between the other two forces.