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OpenStudy (anonymous):
a four-starnd pulley system is used to lift a 120-newton load. what is the effort force needed?
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OpenStudy (shane_b):
The effort force will be the total load (120N) divided by 4.
OpenStudy (shane_b):
For more info: http://hyperphysics.phy-astr.gsu.edu/hbase/mechanics/lever.html http://www.dynamicscience.com.au/tester/solutions/hydraulicus/pulleys2.htm
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