What input work is required for this machine

[hisbul]

Homework Statement

a 25% efficient machine performs external work of 200 J. what input work is required?..please answer,,is the answer is 800 J?

Homework Equations

The Attempt at a Solution

800 J

 

[tiny-tim]

welcome to pf!

hi hisbul! welcome to pf!

a 25% efficient machine performs external work of 200 J. what input work is required?..please answer,,is the answer is 800 J?

yup!