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Another hnch of science which is, perhaps, the greatest contribution of Greek civilisation is mechanics. Mechanics developed out of the necessities of imgation, moving of heavy bodies, ship-building and making military equipment with known tools and methods. As the invading armies of Alexander came in contact with the craftsmen of the iniddleeastem countries, a number of inventions such as the pulley, windlass and screw came into use and were improved upon (Fig.). Archimedes (287-212 B.C.) aided this process of building machines by his ideas of forces having to balance each other to keep a body static (at rest). And his contribution to the study of floating bodies and hydrostatics is useful even today. Fig.: Some mechanical devices used in Greece: a) windlass and pulley for drawing water fran a well; b) crass-section of a water-raising qrew designed by Archimedes. widely used for imgation. Strip of wqal wm wrapped in a spiral on the edge of a round wooden bedm. This was then encased in boards. When placed in water and spun, it caused the water to climb the spiral and gush out.
Wave and tidal energy: Waves and tides are another source of energy which is perpetual and can be converted into electric energy, particularly where sea water can move into a n
which nutrient contains carbon, hydrogen, oxygen, nitrogen and sometimes sulphur and phosphorus?
Burns : There are two types of burns which we are to discuss: 1) Chemical 2) Thermal Chemical burns have already been discussed in Sec. 16.7; so we shall discuss thermal
Explain Specific Defence Mechanism In the section on white blood cells, we learnt that whenever a germ or infection enters our body, the WBCs snap to attention and destroy the
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what is the first layer of the earth
What is a floodplain? If a river tends to flood, the most practical solution might be to designate a more or less flat area along the river as the "floodplain". This Area is p
Q. List the main steps involved in the preparation of oil from oilseeds? The main steps involved in the preparation of oil from oilseeds are: preparation of the raw material,
Explain the Transport of Fructose - Carbohydrates Fructose is converted to glucose after it is being transported. This occurs before entering the portal blood. The conversion o
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