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2016-04-03T21:20:49+05:30

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Pulley is a small fixed wheel or a group of such wheels with a rope or chain in a grooved rim that is used to lift something up.
 
An example of a 
pulley is a device for raising a flag.
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2016-04-03T21:24:28+05:30

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Pulley is a wheel with a grooved rim around which a cord passes, which acts to change the direction of a force applied to the cord and is used to raise heavy weights.
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