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题有一堆从河中捞出的湿砂子,测得其比热容为1.2·103焦/(千克·℃),已知干砂子的比热容为0.9·103焦/(千克·℃),则按质量说,这堆砂子含水的百分比是多少? (99年初物竞)
There is a pile of wet sand removed from the river and its specific heat capacity is measured as 1.2·103 Joules/(kg·°C). The known specific heat capacity of dry sand is 0.9·103 Joules/(kg·°C). According to the quality, What is the percentage of moisture in this pile of sand?