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Electric Currents (id: 2225790cf)

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admin 发表于 前天 20:21 | 显示全部楼层 |阅读模式
本题目来源于试卷: Electric Currents,类别为 IB物理学

[填空题]
An electric heater is used to heat anu4 vs,amf ./jmcwp c4pi3r+lh3h8k8g ; yyd/ room of volume $62\,m^3$ Air is brought into the room at 5$^{\circ}\,C$ and is completely replaced twice per hour. Heat loss through the walls amounts to approximately $850 kcal/h$. If the air is to be maintained at 20$^{\circ}\,C$, what minimum wattage must the heater have? (The specific heat of air is about $0.17 kcal/kg\cdot C?$)    W




参考答案: 1463±2%


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