The relational model describes data using a standard tabular format; all data elements are placed in three-dimensional tables called relations, which are the logical equivalent of files.

a. True.

b. False.

When a user process is running and an instruction is executed that requests a file-open operation, which of the following event will occur? (A) Supervisor call (B) Trap (C) I/O interrupt (D) Fault (E) None of the above

What permanent magnets of a motor are replaced with more powerful ones, what effect do you think this would have on motor rotation? Explain

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You want to create a directory called ~/Documents/papers, but you're not sure that the ~/Documents directory exists.

Predict what would happen to the strength of the electromagnet in each situation. iron nail Using a battery with a higher voltage: Wrapping the wire around the nail only three times: coiled wire Changing the direction of the current by reversing the

A. Which of the following statements is not true about underage drinking? B. Inexperience managing driving and alcohol results in many collisions involving teens. C.

Draw a flowchart or write pseudocode to represent the logic of a program that allows the use to enter values for the width and length of a room's floor in feet. the program outputs the area of the floor in square feet

Instructions:Select the correct answer. Felicia has been having problems with her computer. Her documents won't open, her computer is running slow, and programs automatically open.

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Select all actions that a database may perform 1. Update information in more than one place at the same time. 2. Write a business letter. 3. Create data entry forms. 4. Find the average of four numbers. 5.