ENMA notes - ENMA notes Area under curve in equivalent to...

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ENMA notes Area under curve in equivalent to the area of a triangle Area under curve is the energy absorbed during deferment in energy/volume A load of 4000 Newton’s is applied to an aluminum alloy rod (0.5 cm in diameter 20cm long). How much strain will occur and what is the new length of rod? Common elements in earths crust Oxygen, silicon, aluminum, iron, magnesium, calcium, potassium, sodium, copper, lead Metals of antiquity: iron, copper and lead Ancient metals are not the most common elements in the earths crust Some ancient metals are found in native state Early metals that were found in core were only weakly bounded on the ore, easy to remove by smelting ex. Copper, lead, silver, tin Copper was the first metal to be used widely by ancient civilization Copper ores available and easy to smelt First copper smelting, 4000 bce First copper ores smelted in Mesopotamia probably as a byproduct or accident during firing of clay in a kiln
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