Question

A gust of wind does 125J of work on the blades of a windmill. Because of this the windmill can do 46.9J of useful work output. How efficient is the windmill?

Answer 1

The efficiency of the windmill is 37.52 %.

Step-by-step explanation:

Given that,

A gust of wind does 125 J of work on the blades of a windmill,
`W_i=125\ J`

The windmill can do 46.9 J of useful work output,
`W_o=46.9\ J`

We need to find the efficiency of the windmill. It is given by the ratio of output work to the input work. So,

`\eta=(W_o)/(W_i)* 100\\\\\eta=(46.9)/(125)* 100\\\\\eta=37.52\%`

So, the efficiency of the windmill is 37.52 %.