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第535章 大包子(2 / 2)

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“这…”

所有学生一下子又懵逼了,伞上破了洞肯定会加速掉下去,但这不就跟刚才得出面积越大,所带起的风越大的结论相悖吗?

见学生们再次吃瘪,敬玄又十分得意的笑了起来。

如果是李泰在这,大概一眼就能看出自己的把戏,并且指出自己是在侮辱他的智商,可眼前这群家伙不同,一个个都才刚入物理学这扇大门呢,让他们把观察到的物理现象转化为理论依据,实在是有些强人所难。

“伞面破了洞,就篼不住风了,是这个道理吧?”

有学生小声嘀咕着,即便道理是正确的,但又不敢完全笃信,只得再次征求旁人的意见。

而此时的敬玄,手上也没闲着,掏出早上出门时宇文修多罗用来给自己装包子的包袱皮,用细绳在四周各系了一个角,然后把另一端系在了吃剩下的包子上,随意往空中一抛,一架袖珍的降落伞缓缓在半空中左摇右晃,直至最后安然落地。

而底下的少年们,包括一群先生都看得目瞪口呆,敬玄手里的包子大学食堂也有供应,手掌般的大小,皮儿薄馅多,当做早餐配上稀粥咸菜,极为可口,这也是先生们对大学食堂最为满意的地方,吃食不知甩了国子监弘文馆几条街。

可这白嫩嫩的大包子,不说有半斤,三两总是要有的吧?就这么轻飘飘的在半空中缓缓落地?所依仗的,不过就是一块寻常得不能再寻常的包袱皮,而且他们还特意仔细观察了,那包子压根就没有摔坏,依旧晶莹透亮,还能隐隐约约瞧见里头的馅料。

这是何道理?

这时,敬玄终于从梯子上跳了下来,拍了拍膝盖上的尘土,然后转身在黑板上写下四个大字:

空气阻力。

“这便是我今日要教给你们的东西!”

敬玄指了指四个大字,又指了指依旧完好无损的包子:

“方才有同学算是说到点子上了,即便是在门窗严实的教室里,依旧能通过手段让人感受到风的存在,但事实上,这并不是风,或者说在你们扇扇子之前,那不叫风,那是空气,而空气最显着的特质就是看不见摸不着,无孔不入,但即便如此,我们依旧能用手段观测到它的存在,比如刚才的油纸伞,又比如这块包子,为什么呢?因为空气自带阻力…”

听见先生终于开始讲述原委,不少学生立刻开始着手写笔记,想把敬玄的每一句话都记下来。

而坐在后面的老夫子们,则在好奇心的驱使下,离开座位开始四处观察,像他们平日在教授文史经义时,若当先生的不主动发话,底下的学生压根连笔都懒得动。

“接下来,我给你们布置课后作业,月底时这将作为你们的成绩考核标准。”

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