Question

A person does 500j of work on a a crowbar. the cowbar does 475j of work on a nail. what is the mechical effciency of the crowbar?

Answer 1

mechanical efficiency = 95 %

Step-by-step explanation:

given data

work on cowbar = 500 J

work on nail = 475 J

solution

we get here mechanical efficiency of the crowbar that is express as

mechanical efficiency =
`(work\ nail)/(work\ cowbar)` × 100 .....................1

put here value we get

mechanical efficiency =
`(475)/(500)` × 100

mechanical efficiency = 0.95 × 100

mechanical efficiency = 95 %