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Physical level: The lowest level of abstraction describes how a system actually stores data. The physical level describes complex low-level data structures in detail.Logical level: The next higher level of abstraction describes what data the database stores, and what relationships exist among those data. The logical level thus describes an entire database in terms of a small number of relatively simple structures. Although implementation of the simple structures at the logical level may involve complex physical level structures, the user of the logical level does not need to be aware of this complexity. Database administrators, who must decide what information to keep in a database, use the logical level of abstraction.View level: The highest level of abstraction describes only part of the entire database. Even though the logical level uses simpler structures, complexity remains because of the variety of information stored in a large database. Many users of a database system do not need all this information; instead, they need to access only a part of the database. The view level of abstraction exists to simplify their interaction with the system. The system may provide many views for the same database.
There is no such thing as 'electrical power' or 'mechanical power' or, in fact, any other sort of power. Power is simply a rate -the rate of doing work. In SI, power is measured in watts. An obsolete unit of power is a horsepower. Although, in the Unites States, the power of an engine is usually measured in horsepower, elsewhere it is measured in watts (or, more usually, kilowatts).So, when an engineer describes converting electrical power to mechanical power, what he actually means is the rate of converting electrical energy to mechanical energy.
In its simplest form: a line describes one dimension, a plane describes two dimensions, and a cube describes three dimensions.
What is a warranty
An operator
vestigial
what position is used to describe the position and relationships of structures
The Georgia Entertainment Industry Investment Act awards tax credits for productions filmed in Georgia. Which statement describes how this impacts growth and development in Georgia?
Resources given to the earth to supply production
the technical quality of a media production
Resources given to the earth to supply production
human effort and ideas drive production
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Which of the following describes the rate of force development as part of the force-time relationship?
Which of the following describes the rate of force development as part of the force-time relationship?
production
production