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试题点评:2011年北约自主招生物理试题全部采用计算题,覆盖了高中物理必修一、必修二、选修3—1、选修3—2、选修3—3模块和动量守恒定律等,试题难度与高考相当。1.平直铁轨上停着一节质量M=2m的小车厢,可以忽略车厢与水平铁轨之间的摩擦。有n名组员沿铁轨方向列队前行,另有一名组长在最后,每名组员的质量都为m。(1)当组员和组长发现前面车厢时,都以相同速度υ_0跑步,每名组员在接近车厢时又以2υ_0速度跑着上车坐下。组长却因跑步速度没有改变而恰好未追上车,试求n。(2)组员们上车后,组长前进速度减小为(υ_0)/2,车上的组员朝着车厢前行方向一个接一个水平跳下,
Questions Comments: In 2011, NATO’s self-enrollment physics test questions are all used to calculate, covering the high school physics compulsory one, compulsory two, elective 3-1, elective 3-2, elective 3-3 module and the law of conservation of momentum, test difficulty and the entrance exam quite. 1. On a straight rail, a small car of mass M = 2m is parked, and the friction between the carriage and the horizontal rail can be neglected. There are n team members marching along the track direction, and another leader in the end, the quality of each crew are m. (1) When team members and team leader found the car in front, all run at the same speed υ_0, and each team member got off the vehicle with 2υ_0 speed when approaching the car. The leader did not catch up because of the running speed did not change, try to n. (2) After the team members got on the train, the leader’s speed of advance reduced to (υ_0) / 2, and the team member jumped one by one in the direction of the car’s forward direction,