(UEMA) Recently a fire occurred at an electrical substation in the state of Amapá

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Published on Dec 23, 2024
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Video question: (UEMA) A fire recently occurred at an electrical substation in the state of Amapá, causing a blackout in the capital city and leaving approximately 765,000 people without power. The main impacts of the blackout on the population were the lack of running water, mineral water, and ice. Since there was no way to use the refrigerator, the demand for ice throughout the city was very high. A resident who needed to cool 3,000 g of water in a container, initially at a temperature of 30 ºC, added ice to it at -20 ºC. Consider that all ice melts and that the specific heat of the container can be ignored. Data: specific heat of water = 1 cal/g ºC; specific heat of ice = 0.5 cal/g ºC; latent heat of fusion of ice = 80 cal/g. The amount of ice, in g, for the final temperature to be equal to 0 °C is a) 1286 b) 9000 c) 1125 d) 1000 e) 3000

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