2022年中考物理核心考点专项训练专题08计算题专题―热学部分 .pdf

热学计算题常考知识点 热量的计算能量利用率的计算热机效率的计算热学计算题常考公式 物体吸放热公式：Q cm t 燃料燃烧放热公式 Q mq 能量利用率公式：W有用/Q放热平衡方程 Q吸Q放热学计算题命题规律 从近三年的中考题来看：（1）对于物体吸放热、燃料燃烧放出热量的计算主要是以填空题或选择题的形式进行考查：如2013 北京市中考选择题第9 小题考查水放热的计算公式Qcmt；2013 南京市中考填空题第21 小题考查则是综合考查了热学的多个计算公式；部分地区以计算题的形式综合考查热学的计算，如苏州市中考第 25 题，且多个地区计算题中采用隔年考的方式出现热学计算题。（2）热学知识的考查通常都是以水的吸热或放热为主线，将燃料的燃烧放热和中考物理二轮复习综述中考一轮复习通常是分章节对各个知识点进行整理，理清思路，达到各个击破；中考二轮复习则更注意知识点间的关联与区别，综合应用，实现全线出击。本篇基于对近三年来全国各地中考真题研究，选取分题型复习的角度，从选择填空、作图简答、计算分析、实验探究六大中考题型出发，细分十五个专题进行中考二轮复习。每一专题包含“三年中考概况”、“马年中考策略”、“三年中考回放”、“马年中考演练”四个版块内容，挖掘各类题型的命题规律、给出应试策略，精选三年典型真题进行解析点评，提供精编演练题进行实战体验，站在命题者的高度，立足解题者实际，既有“鱼”之相飨，又授“渔”之功夫，助力冲刺2014中考。热的利用效率问题结合起来。题材多为实际生活中的现实情境，计算量通常较大，但数值运算不会很难计算。中考单独考查热学计算的题目较少，通常都是将热学与力学或电学结合起来考查，此部分内容将在后面计算题综合部分进行讲解。做好热学计算题，首先要区别“温度”、“温度的变化值”是两个不同的概念，往往题目中给出的只是一个初温，而关于末温则是要留意题目中的隐含条件如“一个标准大气压”（隐含水的沸点是100）。如果是给水加热至沸腾，则水的末温就是 100；其次，要注意吸收热量和放出热量之间的关系，若热效率为，已知放出的热量为Q放，要求吸收到的热量Q吸，则 Q吸Q放，已知吸收的热量为 Q吸，要求放出的热量 Q放，则 Q放Q放/，1.（2013 北京市中考物理第20 小题）已知水的比热容为，则 质 量 为2kg的 水，温 度 由25 降 低 到20 放 出 的 热 量 是（）2.（2013南京市中考物理第21 小题）用燃气灶烧水时，把2.2kg 初温为 20的水加热到 100，共燃烧了 45g 天然气（假设天然气完全燃烧）。已知天然气的热值为 4.4 107 J/kg，水的比热容为4.2 103 J/（kg）。天然气属于 _（选填“可再生”或“不可再生”）能源。在烧水过程中，大量向外散失的能量不会自动再汇集回来，这说明能量的转化和转移是有马年中考策略三年中考回放文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2_的。水的内能增加了 _J。燃气灶烧水的效率为 _。3.（2013 沈阳中考物理第20 题）有一根烧红的铁钉，质量是2g，放出 920J的热量后，温度降低到20，求铁钉的初温 c铁=0.46103J/（kg?）4.（2013 兰州中考物理第 34 题）已知煤气的热值为3.6 107J/m3，0.28m3的煤气完全燃烧放出的热量是多少？若这些热量的50%被温度为 20，质量为 30kg的水吸收，则水温升高多少？c水=4.2103J/(kg)文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2根据公式Qcm tV得：QtcmV731.008 1050%4.2 10/()30kgJJkgC40 Co 点评 燃料燃烧完全放出热量的多少，可依据实际情况选择Q vq 或 Q=mq 进行计算。5.（2013 苏州市中考物理第25 题）太阳能热水器是把太阳能转化为内能的设备之一某品牌太阳能热水器每小时平均接受4.2106J 的太阳能，在 5 小时的有效照射时间内，将热水器中质量为100kg、初温为 20的水温升高到 40求：（1）热水器中的水吸收的热量Q：【水的比热容 C=4.2103J/（kg?）】（2）热水器 5 小时内接收到的太阳能E；（3）热水器的效率；（4）若改用煤气来加热这些水，需要完全燃烧多少千克煤气？（煤气的热值q=4.2107J/kg，假设煤气燃烧放出的热量全部被水吸收）文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X26.（2013 杭州市中考物理第36 题）某研究小组为测量垂直于太阳光的面积为1米2表面上，每秒钟接受到的太阳能，用自制太阳能热水器做实验。经多次试验得到自制太阳能热水器吸收太阳能的效率为50%。控制太阳能热水器接受太阳光垂直照射的面积始终是2 米2，太阳能热水器内的水的质量为100 千克，水的初温为 200C，经 8750s 时间后上升到 450C【C水=4.2103)/(kg)】。请计算：(1)、在上述过程中太阳能热水器内的水吸收热量是多少焦耳？(2)、垂直于太阳光的1 米2表面上，每秒钟接受到的太阳能是多少焦耳？文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2 点评本题中要注意求太阳能热水器接收到太阳辐射的能量时，用公式 Q光=Q/计算。1.（2013?郴州）在标准大气压下，将0.2kg 水从 25加热至沸腾需吸收的热量是（C水=4.2103J/（kg?）（）A2.1 103J B6.3 103J C2.1 104J D6.3 104J 2.（2013?黑河）用电水壶烧水时，如果将壶内20的水的温度升高60，水吸收的热量是 5.04105J，那么壶内水的质量是kg；水的比热容较大，在日常生活中有许多应用此知识的地方，请举出一个实例：马年中考演练文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X23.（2013?长沙）某电热壶的电阻为40（假定恒定不变），工作时电流为 5A 一标准大气压下，用该电热水壶将 0.5kg 的水从 20加热至 100，最少需要吸收热量J，电热水壶至少要工作s4.小阳家的热水器装有质量为器装有质量为5kg 的水，该热水器中的水的温度从 20升高 40，求这些水吸收的热量。水的比热容为34.210 J（kg）5.燃烧 1m3的煤气大约能放出热量3.9 107J，某市煤气管道的煤气收费标准为1.50 元/m3,徐锐家在一个月内烧煤气消耗了1.17109J 热量，这个月应交煤气费多少元？文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X26.天然气灶烧水，燃烧0.5m3的天然气，使 100kg 的水从 20升高到 70。已知水的比热容为 c=4.2 103J/（kg?），天然气的热值为q=7.0107J/m3。求：（1）0.5m3天然气完全燃烧放出的热量Q放；（2）水吸收的热量 Q吸；（3）燃气灶的效率。7.某家庭每天需要生活用热8.4 106 J，他们利用煤气灶需燃烧0.8 煤气来获取这些能量已知煤气的热值q4.2 10J/kg，水的比热容 c4.2 10J/（kg）求：（）求在一个标准大气压下，它们家每天获取的热量将25、25的水加热到多少；（）煤气灶的热效率；（）若他家使用电加热设备来获取这些热量，则与煤气灶相比，试说出优缺点各一条文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X7O8Z8 ZK4A6O9W5X2文档编码:CV7I10V8L4Y2 HI7P8X