试题与答案

水的比热容较大,生活中,我们常用水来加热或散热,例如:冬天常用热水袋取暖,把质量

题型:填空题

题目:

水的比热容较大,生活中,我们常用水来加热或散热,例如:冬天常用热水袋取暖,把质量为2Kg,温度为90℃的热水装入热水袋中,到温度降为30℃的时侯,此水放出了___________J的热量;如果用相同质量,相同温度的沙来取暖,这沙会冷得_______ (填“快些”或“慢些”)。【C=4.2×103J/(kg·℃)】

答案:

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参考答案:A

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