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Simple machines are useful because they reduce effort or extend the ability of people to perform tasks beyondtheir normal capabilities. Simple machines that are widely used includethe wheel and axle, pulley, inclined plane, screw, wedge and lever.
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Trade barriers protect industries from foreign competiton. Trade barriers reduce tarrifs and encourage world trade.
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The African-American religious folk songs known as spirituals grew out of the slavery experience and the introduction of Christianity into slaves' lives.
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6. Many people viewed this as sacred because they had won their freedom from King George. They were kind of like slaves to the British.
7. They argue this because Mrs. Washington made one, but that was not the chosen American flag.
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The spatial cueing or Posner cueing task (Posner, 1980) is a common paradigm for studying visual attention. For the participant, the task is easy: detect when a target stimulus is presented, and respond as quickly as possible. Usually, the stimulus appears either on the left side or the right of the screen, and participants are cued before the stimulus appears. The cue is sometimes "exogenous" (e.g., the cue appears at the same location as the upcoming stimulus), and sometimes "endogenous" (e.g., a centrally-presented arrow pointing to the location of the upcoming stimulus), but in both cases cue the participant to the potential target location.
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