23. Number of turns of nickel wire having a diameter of

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23. Number of turns of nickel wire having a diameter of 0.1 mm is necessary to china navit cylinder diameter 2 cm to arrange the heater by which boil over 10 minutes 200 grams of water with an initial temperature of 10 0C. Consider that 60% of the electrical energy goes into heating the water, the heat capacity of water 4,2 • 103Dzh / kg • K, the resistivity of the nickel 0,42 • 10-6 ohm • m, the mains voltage of 120 V.

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Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)


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