1:1  02-07[物理]牛老师带大家掌握解决力学问题的关键
推荐理由：通过本题，牛老师教你明确研究对象的状态，进行受力分析，列受力平衡方程，应用规律计算，教你解决力学问题的关键。 讲解人：http://www.jiandan100.cn/teacher/2f16e597c5fe4158837c16674ddc3a86/ ，北京市高级教师，市级骨干教师，2008年北京市中考物理命题教师。 题面：一列质量为1×10^3t的火车，以180km/h的速度在平直轨道上匀速行驶，整列火车受到的阻力是9×10^3N。 （1）火车的牵引力多大? （2）火车行驶1min时间内，重力做了多少功?机车牵引力做了多少功?牵引力的功率多大? 【答案及详解】 本部分内容设定了隐藏,需要回复后才能看到
 跟帖分享你的答案，即可看到正确答案和解析！别忘了回帖后再点进来查看答案哦~
同学们，你知道解决力学问题的关键是什么了么？ ------------------------------------------------------------------------------------------------------------------------------------------------------------------ 查看更多本年级每周一题，请点击：http://www.jiandan100.cn/bbs/upload/forumdisplay.php?fid=380& 浏览本期“简单学习电子周报”完整目录：http://www.jiandan100.cn/bbs/upload/viewthread.php?tid=659008 |
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