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2014年高考刚刚落下帷幕,其中有很多的真题值得研习和探讨。在品味这些试题的同时,也可将其稍作扩展、变化,用以丰富平时的教学资源。笔者现以今年全国高考四川理综卷物理第10题(倒数第2道计算题)为例,谈谈自己的一些粗浅认识。高考真题(2014年全国高考四川理综卷物理第10题)在如图1所示的竖直平面内,水平轨道CD和倾斜轨道GH与半径r=9/44m的光滑圆弧轨道分别相切于D点和G点,GH与水平面的夹角θ=37°。过G点、垂直于纸面的竖直平面左侧有匀强磁场,磁场方向垂直于纸面向里,磁感应强度B=1.25 T;过D点、垂直于纸
2014 college entrance examination has just ended, many of which Zhenti worth studying and discussion. In the taste of these questions at the same time, it can be slightly expanded, change, to enrich the usual teaching resources. The author now in this year’s national college entrance examination in Sichuan Physical Science Volume 10 (countdown No. 2 calculation) as an example, to talk about some of their superficial understanding. In the vertical plane shown in Figure 1, the horizontal track CD and inclined track GH are tangent to the smooth circular orbit of radius r = 9 / 44m, respectively At points D and G, the angle between GH and horizontal plane θ = 37 °. G point, perpendicular to the vertical plane of paper on the left there is a uniform magnetic field, the magnetic field perpendicular to the direction of the paper inside, magnetic induction B = 1.25 T; D point, perpendicular to the paper