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顶端 Posted: 2007-09-26 12:09 | [楼 主]
妖刀村正



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This is Paul and I'm a fan of this podcast. Today's podcast is brought to you by audible.com, the leading provider in spoken word entertainment. Log on to www.audible.com/science to get a free audio book download of your choice when you sign up today.

This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute?

It's been a fun baseball season, but the storm cloud of steroids has hung over the game for years now, especially tarnishing BarryBon's assault on the all-time home run record.Tufts University physicist Roger Tobin is a big baseball fan / and recently did some calculations to evaluate just how much of an impact steroids could actually have on power hitting. When he crunched the numbers, he found the following:

Steroids might bring about a 10% increase in muscle mass, that extra muscle could help a batter swing 5% faster. And that extra bat speed could cause a ball to jump off the bat 4% faster. It doesn't sound like much, however if you add 4% initial velocity to a model distribution of trajectory of batted baseballs, you can increase homers by a full 50%.Tobin's research will appear in the American journal of Physics. He notes that weight-lifting in / smaller ball parts also plays a role in pumping up the number of homeruns. But the power surges of the 90s coincide with steroids more than the other factors.

Thanks for the minute for a Scientific American's 60-Second Science. I'm Steve Mirsky.
顶端 Posted: 2007-09-26 12:09 | [1 楼]
hoollywood



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怎么没有图像啊???
顶端 Posted: 2007-09-26 12:14 | [2 楼]
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Quote:
引用第2楼hoollywood于2007-09-26 12:14发表的  :
怎么没有图像啊???

这个是音频文件
顶端 Posted: 2007-09-26 12:59 | [3 楼]
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