By lubricating the pulley, the work needed was decreased from 50 J down to 44 J. The output work of the pulley remained 40 J. The efficiency of the pulley AFTER lubrication is

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asked Jul 27, 2023 184k views

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By lubricating the pulley, the work needed was decreased from 50 J down to

44 J. The output work of the pulley remained 40 J.
The efficiency of the pulley AFTER lubrication is

Physics
high-school

Kaan Burak Sener asked

by Kaan Burak Sener

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Before lubrication:

$\tt (40)/(50)* 100\%=80\%$

The efficiency of the pulley after lubrication becomes:

$\tt (40)/(44)* 100\%=91\%$

Fernando Moreira answered Jul 31, 2023

by Fernando Moreira

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