有一根烧红的铁钉,温度是800℃,质量是1.5g,温度降低到20℃,放出多少热量?
人气:212 ℃ 时间:2019-11-22 00:28:16
解答
从课本比热容表中查得铁的比热容c=0.46×103J/(kg•℃),铁钉放出的热量:
Q放=cm△t=0.46×103J/(kg•℃)×1.5×10-3kg×(800℃-20℃)=538.2J.
答:铁钉放出的热量为538.2J.
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