作者查詢 / lefan
作者 lefan 在 PTT [ Physics ] 看板的留言(推文), 共143則
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4F推: 一半沒錯，哪有可能電線電阻變小，能量損耗還變大的道理02/05 15:09
5F→: 出題老師把簡單的電路與發電廠的電路損耗問題弄混淆了02/05 15:10
5F推: https://ibb.co/1JzrGyD01/19 23:06
6F→: 很有意思的問題，重點是魚的構造是有能讓桿子靠住的，所以01/19 23:07
7F→: 魚是處於三力平衡狀態（魚本身的重力夠小可忽略）01/19 23:07
9F→: 嗯，佑來了做的魚沒有上端的魚鰭來靠桿，所以不是穩定平衡01/20 09:53
10F→: ，必需比較激烈上下晃動來保持相對平衡，而原始影片中的擺01/20 09:53
11F→: 魚有，可以穩定的擺動，看起來還是略有不同01/20 09:53
8F推: 其實想一下就知道光的頻率可是10^15Hz左右，換成閃爍週期11/18 21:10
9F→: 就是10^-15秒，和視覺暫留的1/16秒不同數量級，討論眼睛感11/18 21:10
10F→: 光用光子說比波動好多了11/18 21:10
48F→: 很酷，十年四次重力彈弓，有人能神到更大的圖檔嗎11/12 12:32
49F→: http://i.imgur.com/TUkKuhf.gif 圖檔感覺太小了11/12 12:33
51F→: 感謝11/12 18:03
1F推: 因為S(弧長)=R(dθ)09/27 10:03
14F推: 課本-->南一龍騰翰林等參考書任一-->綠皮書(黃皮書)09/15 21:51
1F推:原則上可以用連續方程式來控制流量，但實際上的操作要你自己01/12 23:00
2F→:控制了。01/12 23:00
2F推:請Google SI制01/09 14:34
1F推:明顯與否，只是相對問題，只要用第一暗線散射角=λ/b12/31 13:36
2F→:來考慮即可，因為一般而言僅繞射中央亮帶能量顯著。12/31 13:37
3F→:若λ/b過大(大於Pi/2弧度或90度)，此狹縫即可視為點波源討論12/31 13:39
4F→:當然啦，這之間還有強度上的討論。12/31 13:40
1F推:應該用散熱速度解釋，人的散熱功率約100W12/30 15:38
2F→:水的散熱效率比較高，但你這邊的舉例舉的並不好，應該用12/30 15:39
3F→:在32度的空氣與35度的水討論。12/30 15:39
4F→:人在32度的空氣中散熱速度是比在35度的水的速度慢，12/30 15:40
5F→:所以感覺會比較熱。12/30 15:40