Question

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?

Answer 1

Answer: 63 J

Step-by-step explanation:

The effiency (
`E`) 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`