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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

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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17 votes
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

asked
User Kaan Burak Sener
by
8.5k points

1 Answer

10 votes

Before lubrication:


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

The efficiency of the pulley after lubrication becomes:


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

answered
User Fernando Moreira
by
7.8k points
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