The input work on a pulley system is 75 J. If the pulley system is 84 percent efficient, then what is the output work from the pulley system?

Question

asked Nov 4, 2020 164k views

1 Answer

Knut Marius · Answer 1 · 2020-11-09T17:51:51+0000

Answer: 63 J

Step-by-step explanation:

The effiency (
) of a machine is given by the ratio between the output work
W_(out) and the input work
W_(in) :

E=(W_(out))/(W_(in))

Where:

$E=84\%=0.84$

W_(in)=75 J

Isolating
W_(out) :

W_(out)=E W_(in)

W_(out)=(0.84)(75 J)

Finally:

W_(out)=63 J