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Image: Polispasto4

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Description: A double tackle has two pulleys in both the fixed and moving blocks with four rope parts dividing the load of 100N. The mechanical advantage is 4, requiring a force of only 25N to lift the load.
Title: Polispasto4
Credit: Wikipedia en Español
Author: CR
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC-BY-SA-3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0/
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