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In 1656, the Burgmeister (mayor) of the town of Magdeburg, Germany, Otto Von Guericke, carried out a dramatic demonstration of the effect resulting from evacuating air from a container. It is the basis for this problem. Two steel hemispheres of radius 0.350 m (1.15 feet) with a rubber seal in between are placed together and air pumped out so that the pressure inside is 11.00 millibar. The atmospheric pressure outside is 960 millibar. Calculate the force required to pull the two hemispheres apart.Two equal teams of horses, are attached to the hemispheres to pull it apart. If each horse can pull with a force of 1390N (i.e., about 312 lbs), what is the minimum number of horses required?

Sagot :

es 500=

55,58

22 es corta

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