Why does the evaporation of sweat cool your body on a warm day?

Using a wheel and axle, a farmer is trying to lift a bucket of water from the bottom of a well. the larger wheel has a radius of 40 cm compared to the axle that has a radius of 10 cm. if a bucket of water is 50 n, then how much effort is required to raise it? 12.5 n 200 n 2 n 500 n

Anybody wanna ? (picture included? )

What is a carrier wave and how does it affect what you hear on the radio