麻烦分享一下 405207009@qq.com 保佑你拿奖作者: 小小大大陌 时间: 2011-2-13 09:29 zhangzhuying1216@163.com
谢谢啊！作者: kuloburni 时间: 2011-2-13 09:29
楼主和各位收到的同学 麻烦分享 405207009@qq.com 祝你拿奖哦作者: 蓝枫之樱 时间: 2011-2-13 09:34 252535486@qq.com也发我一份吧~~谢谢谢谢~~作者: L-Ling 时间: 2011-2-13 09:35 524010229@qq.com,楼主，等你ing。作者: minkey0304 时间: 2011-2-13 09:35 1007811362@qq.com 求分享。。。谢谢。。作者: 鱼蓝 时间: 2011-2-13 09:36 619599142@qq.com作者: 王志文 时间: 2011-2-13 09:37
谢楼主！715301322@qq.com作者: zxined 时间: 2011-2-13 09:38
麻烦大家了，有的传一份吧 261969474@qq.com作者: chendi1899 时间: 2011-2-13 09:39 chendi0111@163.com THX!!作者: alvine 时间: 2011-2-13 09:39 249797135@qq.com楼主人真好作者: Camille 时间: 2011-2-13 09:45 919518198@qq.com谢谢啦作者: shmitaly 时间: 2011-2-13 09:46 n001.student@sina.com 求！！！！作者: shishouwangxin 时间: 2011-2-13 09:50
1.Restatement of the Problem
Explain the “sweet spot” on a baseball bat.
Every hitter knows that there is a spot on the fat part of a baseball bat where maximum power is transferred to the ball when hit. Why isn’t this spot at the end of the bat? A ** explanation based on torque might seem to identify the end of the bat as the sweet spot, but this is known to be empirically incorrect. Develop a model that helps explain this empirical finding.
Some players believe that “corking” a bat (hollowing out a cylinder（圆筒） in the head of the bat and filling it with cork or rubber（橡胶）, then replacing a wood cap) enhances the “sweet spot” effect. Augment your model to confirm or deny this effect. Does this explain why Major League Baseball(美国二大职业棒球联盟之一) prohibits(禁止) “corking”?
Does the material out of which the bat is constructed matter? That is, does this model predict different behavior for wood (usually ash) or metal (usually aluminum) bats? Is this why Major League Baseball prohibits metal bats?
2.Analysis of the Problem 作者: zwzw0097 时间: 2011-2-13 09:50
求分享,多谢 1017578996@qq.com作者: zwzw0097 时间: 2011-2-13 09:51 回复 lhjrick 的帖子
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麻烦分享一下 405207009@qq.com 保佑你拿奖