Question

What is the work input to lift a box of 810 with a 50% mechanical efficiency?

Answer 1

Work input = 1620

Step-by-step explanation:

Given the following data;

Work output = 810

Efficiency = 50%

To find the work input;

Mathematically, efficiency is given by the formula;

`Efficiency = \frac {Out-put \; work}{In-put \; work} * 100`

Substituting into the formula, we have;

`50 = \frac {810}{WI} * 100`

Cross-multiplying, we have;

`50I = 810 * 100`

`50I = 81000`

`WI = \frac {81000}{50}`

Work input = 1620