## pulley math | The HobbyMachinist

background: I bought a homemade mill from a friend and he didn't know the rpm of the original drill press but fortunately there was a table of speeds on the sides for the 5 original pulleys: 3100, 2340, 1720, 1100 and 620 The pulley diameters for both drivers and driven are 175, 225, 25, 3

## Build an Anemometer to Measure Wind Speed

For example, a spinning top, a falling object and a rolling ball all have kinetic energy The motion, if resisted by a force, does work Wind and water both have kinetic energy knot: (Nautical definition) A unit for measuring wind speed over water 1 knot = = 1852 kilometers per hour (or, 115 miles per hour) In nautical usage knot is a unit