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OpenStudy (anonymous):
The pulley has an efficiency of 78% . How much useful work does the pulley do if you perform 775 J of work on the pulley? Help please??
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OpenStudy (michele_laino):
please keep in mind that an efficiency of 78%, means that every 100 J of work done, 78 are used and 100-78=22 are lost by friction for example
OpenStudy (michele_laino):
so your answer is: 775*0.78=...
OpenStudy (anonymous):
Ohh okay!! thanks a bunch!! :)
OpenStudy (anonymous):
@Michhele_Lanio
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