(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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

2. Relevant equations

3. The attempt at a solution

800 J

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: What input work is required for this machine

**Physics Forums | Science Articles, Homework Help, Discussion**