SIMPLE MACHINES and the ELECTROMAGNETIC SPECTRUM - Tapa blanda

Sinopsis

Simple machines are devices that we use every day. Our complex machinery is simply a multiplication of these simple devices. The Laws of Motion are also briefly explained. The Electromagnetic Spectrum is also used by us each day to see things, to listen to the radio on, and to watch television and use our electronic devices. Other uses are illustrated and explained in a short, simple manner.

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