作者查詢 / hwider
作者 hwider 在 PTT [ Physics ] 看板的留言(推文), 共110則
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2F推: 亂猜,隨著台底的小彈珠數漸增,拉桿彈簧兩端的質量就不12/24 16:51
3F→: 同了,而有誤差。12/24 16:51
6F推: 而且,彈珠台拉桿洞可能薄薄的,準確度較低,就像短槍難12/24 16:58
7F→: 以用來狙擊,而長槍才有辦法狙擊一樣。12/24 16:58
5F推: 宇宙要無窮大,而且恆星壽命永恆,就有可能夜晚如白晝。10/17 12:36
6F→: 恆星其實蠻稀疏的,所以如果宇宙不是無窮大,天空上每一10/17 12:39
7F→: 個像素也就不會充滿恆星,也就不會夜如白晝。10/17 12:39
1F→: 我以前也是台大物理學系學生,當時沒好好學,也沒修息到08/30 00:08
2F→: 陳老師與高老師的課程,直到現在才又對物理學重新拾取興08/30 00:08
3F→: 趣,感謝許多老師與台大分享這些演講影片!08/30 00:08
5F→: 哦哦哦,我去搜尋看看,謝謝樓上08/30 06:26
30F推: 感謝推薦05/30 21:47
8F→: 海森堡那本+105/30 21:42
1F推: 感到科幻09/23 11:30
1F→: 好問題08/29 07:32
1F→: 自己有加速度時,會相當於有重力,自己會察覺的,例如蘋08/23 10:43
2F→: 果就會落下。08/23 10:43
3F→: 印象中似乎出力也是"突然"用力,力還沒傳至繩子中點就已08/23 11:00
4F→: 經讓繩子受不了了,不曉得是不是這樣解釋。08/23 11:00
1F推: N+F=W 。然後再以棍子的N端為支點,算力矩平衡: 1.5R*W=208/16 21:22
2F→: .4R*F,得出F=(5/8) W,再得出N。08/16 21:22
3F→: N+F=W是因為N和W已經垂直於地面了,所以F也只能跟著垂直08/16 21:24
4F→: 於地面,木頭才能靜止。08/16 21:24
2F推: 原來如此啊,謝謝07/18 21:32