The representatives from six major international film festivals attended a ____ (week) programme. Maria says that the Venice Film Festival is the oldest film festival in the world, ____is an annual festival that ____ (begin) in 1932. Kathy tells the audience that the Sundance Film Festival deliberately boycotts all Hollywood films and that they don't foresee ever including ____. Isabel says Cannes is ____ festival that can make films famous, at which many films ____ (show) to the public for the first time. At Berlin International Film Festival, Hollywood films are ____the minority, films that are likely to be overlooked at other festivals have a real chance of ____ (become) champions. Mike thinks the Toronto International Film Festival is the ____(two) largest festival in the world. Xu Li says the Shanghai International Film Festival has a good reputation worldwide and they have ____ (entry) from many different countries.

可遗传的变异是由什么引起的

某同学的解题思路如下：

可以先算出钢块静止在ABC上恰好使支架转动的位置，如图（b）所示．根据支架受力情况写出此时力矩平衡的式子：M_N=M_f+M_G，可根据该式子求出该位置到C点的距离s₁；

（M_N、M_f、M_G分别是钢块对斜面的压力的力矩、摩擦力的力矩以及T型支架自身重力的力矩，其中N=m₂gcos37°，f=m₂gsin37°．）

然后算出钢块以4m/s的速度在斜面上最多能滑行的距离s₂；

比较这两个距离：若s₁≥s₂，则T型支架不会绕D点转动；若s₁＜s₂，则会转动．

请判断该同学的解题思路是否正确，若正确，请按照该思路，写出详细的解题过程，求出结果；若不正确，请给出你认为的正确解法．

角α的终边上有一点P（m，5），且cosα=$\frac{m}{13}$(m≠0），则sinα=（　　）