[問題] 台中一中高二物理段考
https://goo.gl/j60Stq
第6題
A沒問題
答案給C 只是把A的重力位能換成動能而已
但A球不是有受輕桿的力嗎?
E選項看不出哪裡錯
B選項 B球最後應有一往左的速度 不知如何算出
D選項 應該就是把C的答案乘上mg
想延伸一下
這題有辦法算出落地時間嗎
或是算出某時刻兩球的速度?
想了一下不知如何下手
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推
05/22 18:56, , 1F
05/22 18:56, 1F
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05/22 18:57, , 2F
05/22 18:57, 2F
A球軌跡是一橢圓 最後一瞬間的速度應是垂直向下
B最後無速度應說得通 但選項C與E仍有疑惑
為何是力學能守恆阿
※ 編輯: GuanSi (61.230.130.6), 05/22/2016 19:13:04
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05/22 20:00, , 3F
05/22 20:00, 3F
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05/22 20:00, , 4F
05/22 20:00, 4F
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05/22 20:03, , 5F
05/22 20:03, 5F
是光滑平面
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05/22 20:03, , 6F
05/22 20:03, 6F
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05/22 20:03, , 7F
05/22 20:03, 7F
一個物體受正向力等速往上
這樣有力學能守恆?
※ 編輯: GuanSi (111.243.108.151), 05/22/2016 20:07:46
※ 編輯: GuanSi (111.243.108.151), 05/22/2016 20:08:51
推
05/22 21:30, , 8F
05/22 21:30, 8F
推
05/22 21:40, , 9F
05/22 21:40, 9F
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05/22 21:40, , 10F
05/22 21:40, 10F
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05/22 21:40, , 11F
05/22 21:40, 11F
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05/22 21:40, , 12F
05/22 21:40, 12F
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05/22 21:40, , 13F
05/22 21:40, 13F
系統質心位移是向下
那這樣正向力應該有做功耶...
這樣應該就沒有力學能守恆了吧
※ 編輯: GuanSi (111.243.108.151), 05/22/2016 22:05:39
推
05/22 22:27, , 14F
05/22 22:27, 14F
推
05/22 22:31, , 15F
05/22 22:31, 15F
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05/22 22:31, , 16F
05/22 22:31, 16F
不太懂為啥正向力是保守力
我上面有提到
物體受正向力等速上升 有力學能守恆?
※ 編輯: GuanSi (111.243.108.151), 05/22/2016 23:23:52
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05/22 23:48, , 17F
05/22 23:48, 17F
推
05/23 00:02, , 18F
05/23 00:02, 18F
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05/23 00:03, , 19F
05/23 00:03, 19F
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05/23 00:03, , 20F
05/23 00:03, 20F
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05/23 00:04, , 21F
05/23 00:04, 21F
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05/23 00:05, , 22F
05/23 00:05, 22F
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05/23 00:06, , 23F
05/23 00:06, 23F
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05/23 00:07, , 24F
05/23 00:07, 24F
同上回應
※ 編輯: GuanSi (111.243.108.151), 05/23/2016 00:28:28
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05/23 00:58, , 25F
05/23 00:58, 25F
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05/23 00:59, , 26F
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05/23 01:02, , 27F
05/23 01:02, 27F
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05/23 01:03, , 28F
05/23 01:03, 28F
推
05/23 01:15, , 29F
05/23 01:15, 29F
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05/23 01:16, , 30F
05/23 01:16, 30F
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05/23 01:16, , 31F
05/23 01:16, 31F
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05/23 01:18, , 32F
05/23 01:18, 32F
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05/23 01:18, , 33F
05/23 01:18, 33F
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05/23 01:19, , 34F
05/23 01:19, 34F
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05/23 01:19, , 35F
05/23 01:19, 35F
推
05/23 11:10, , 36F
05/23 11:10, 36F
推
05/23 11:19, , 37F
05/23 11:19, 37F
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05/23 11:19, , 38F
05/23 11:19, 38F
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05/23 11:19, , 39F
05/23 11:19, 39F
推
05/23 14:13, , 40F
05/23 14:13, 40F
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05/23 14:14, , 41F
05/23 14:14, 41F
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05/23 14:29, , 42F
05/23 14:29, 42F
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05/23 14:35, , 43F
05/23 14:35, 43F
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05/23 14:36, , 44F
05/23 14:36, 44F
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05/23 14:36, , 45F
05/23 14:36, 45F
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05/23 14:37, , 46F
05/23 14:37, 46F
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05/23 14:41, , 47F
05/23 14:41, 47F
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05/23 14:46, , 48F
05/23 14:46, 48F
推
05/23 21:17, , 49F
05/23 21:17, 49F
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05/23 21:18, , 50F
05/23 21:18, 50F
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05/23 22:37, , 51F
05/23 22:37, 51F
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05/23 22:38, , 52F
05/23 22:38, 52F
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05/23 22:38, , 53F
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05/23 22:41, , 54F
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05/23 22:42, , 55F
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05/23 22:43, , 56F
05/23 22:43, 56F
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05/23 22:44, , 57F
05/23 22:44, 57F
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05/23 22:45, , 58F
05/23 22:45, 58F
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05/23 22:46, , 59F
05/23 22:46, 59F
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05/23 22:47, , 60F
05/23 22:47, 60F
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05/23 22:48, , 61F
05/23 22:48, 61F
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05/23 22:49, , 62F
05/23 22:49, 62F
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05/23 22:50, , 63F
05/23 22:50, 63F
推
05/24 00:38, , 64F
05/24 00:38, 64F
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05/24 00:40, , 65F
05/24 00:40, 65F
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05/24 00:40, , 66F
05/24 00:40, 66F
推
05/24 02:44, , 67F
05/24 02:44, 67F
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