Structure and the importance of the levers
The levers are the most common simple machines that help man to perform heavy tasks easily. They were first described in 260 B.C, The liver is affected by an effort force and a resistance...
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Observing space and invention of Telescopes, Hubble telescope & Satellites
Astronomical telescope Who was the first scientist who made the astronomical telescope? ” Galileo ” was the first scientist who made an astronomical telescope in 1609. It was made from lenses to collect the...
Uses of light bulbs and their structure
The electric lamps Electric lamps are tools that convert electric energy into light energy by passing electricity through them, There are different types of electric lamps, but the most popular of these lamps are...
Mechanical waves and some technological applications of sound mechanical waves
Mechanical waves are the waves that propagate through a material medium (the solid, the liquid, or the gas) at a wave speed that depends on the properties of that medium. The mechanical waves need...