还有那个滑雪飞了的人,(妈的,摔死他!),在滑到角度a的时候飞了,那时候N=0了,也就是说重力向圆心方向的分力都用来做向心加速度了,就是mg cos a = mv2/R,又因为能量守恒,滑到了a角度时,动能和重力势能的关系是,mgh = 1/2 mv2, 又因为从图上可以看出,h = R - R cos a, 带进去,R虽然没给,但是消了,质量没给,也消了,最后的是,2(1-cos a)=cos a,所以a = arc cos 2/3.就是48.2 啊。。。。。:D
I am going to Montreal tomorrow morning, noon or afternoon, no later than 3 oclock in the afternoon. please call cell 613-263-0380 or send me Qiaoqiaohua.
Thanks a lot.
Your Fig 3 should give you 2 straight lines for whatever 2 ph you are using out of the three, because it is supposed to obey pseudo first order thing......And in my case both of the curve are perfectly straight lines with the slope of 1, thus a=1, I dunno if I am right, anyway just my 2 cents.