Answer to Question #195089 in Physics for Saron

Question

A simple wheel and axle is used to lift a bucket of water out of well.the radii of the wheel and axle are 20cm and 4cm respectively.determine the theoretical effort required to lift a load of 30N assuming no energy losses?

Answer 1

The theoretical effort required to lift the load W is

$$F=\frac rRW=\frac{4}{20}·30=6\text{ N}.$$