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An elastomer is a polymeric substance obtained after vulcanization of rubber. Vulcanization is the process of improving the properties of rubber by heating with sulphur. A normal rubber is not useable as it becomes brittle at low temperature and sticky at high temperature. Charles Goodyear had been trying to 'cure' the rubber so that it could be used in all seasons. He tried to mix all kinds of things such as ink, black pepper, cheese and what not. But he couldn't succeed until he dropped a piece of rubber on stove accidentally.
To his surprise, he found that instead of melting the rubber piece hardened and remained pliable. It was found in the lab that it contained traces of sulphur. Goodyear perfected the process and named it 'vulcanization' after the Roman God of fire, 'Vulcan'.
Q If the degree of curve is defined by the angle at the center subtended by an arc (or chord) 20 meters, find the length of the chord in meters so that the versine measured in cm
i want to just understand civil eng main points of all subjects which i becam able to tell some body about this tha what is this ?
Calculate the Actual Water Cement Ratio A jobsite delivery ticket is shown below for a grout mix. The actual w/c ratio is most nearly: Solution: Note, althou
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two locomotive moving on opposite bank of a canal can pull a vessal parallel to the banks by the means of two rope.the force in the ropes are 20kN and 24kN while the total angle be
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