A cable weighs 2kg/m is attached to a sack filled with sugar that weights 100kg. The sack is initially at the bottom of a 100m mine shaft. Determine the amount of work required to lift the bucket to the midpoint of the shaft. 7500kgm 200000kgm 10000kgm 12500kgm

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Types and properties of steel

Steel is an alloy of iron. It is formed by heating iron and combining carbon (0.1-1.7%) with it and minor amounts of other elements such sulfur,  chromium, manganese, nickel, etc. Thousands of steel grades have been published, registered, or regulated around the world, each with its chemical composition, and special numbering systems have been devised in various countries to classify the vast number of alloys.