gc textbook chater 14 heat (id: 395e69baa)

本题目来源于试卷: gc textbook chater 14 heat，类别为 IB物理学

[填空题]
If coal gives off $30\,MJ/kg$ when it is burned, how much coal would be needed to heat a house that requires $ 2.0\times10^{5 }\,MJ$ for the whole winter? Assume that 30% of the heat is lost up the chimney.    kg

参考答案: 9500±2%


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