close
Blogtrottr
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決 
靜力平衡小疑惑 繩子長短的原因
Jul 27th 2013, 10:12

雖然只問C選項,還是要從A選項說起會比較清楚

(A)既然已經靜止了(即使沒有水平),合力矩=0
力矩La=Lb

(b)因為質心離金屬線B比較近,力臂Db <Da
力矩La=Lb ,Da*Fa = Db*Fb
Db <Da , Fb >Fa

(c) 因為Fb >Fa,金屬線B的伸長量>金屬線A的伸長量
最後等長,所以金屬線B的原長<金屬線A的原長

金屬線B原來比較短。

參考資料: KING TEACHER

This entry passed through the Full-Text RSS service — if this is your content and you're reading it on someone else's site, please read the FAQ at fivefilters.org/content-only/faq.php#publishers. Five Filters recommends: 'You Say What You Like, Because They Like What You Say' - http://www.medialens.org/index.php/alerts/alert-archive/alerts-2013/731-you-say-what-you-like-because-they-like-what-you-say.html

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions
arrow
arrow
    全站熱搜
    創作者介紹
    創作者 omoss 的頭像
    omoss

    中視聶小倩線上看 , 聶小倩線上看第二集 , 聶小倩 中視 , 聶小倩電視劇 , 聶小倩

    omoss 發表在 痞客邦 留言(0) 人氣()