Question

pulley A requires 100 J of input work, but has an output work of 75 J. Pulley B requires 100 J of input work, but has an output work of 80 J. what is the efficiency percentage of Pulley A?

Answer 1

The efficiency percentage of Pulley A : 75%

Further explanation

Given

input work = 100 J

output work = 75 J

Required

the efficiency

Solution

The efficiency percentage : the ratio of output work to input work

The efficiency of Pulley A :

$\tt \%efficiency=\dfrac{out}{in}\times 100\%\\\\\%efficiency=\dfrac{75}{100}\times 100\%\\\\\%efficiency=75\%$