[解題] 高二衝量動量(槍射子彈題)
1.年級:高二理組
2.科目:龍騰 高二下第一章
3.章節:衝量動量
4.題目:機槍每秒發射10顆子彈,每顆子彈質量50g,子彈出口速度為對地600 m/s,則
(1)每發子彈作用於機槍的衝量量值為___牛頓‧秒(A:30)
(2)如果欲使槍身不後退,槍手須施一作用力F給槍身,
則當F之量值為240牛頓時,機槍每秒鐘可發射___顆子彈(A:8)
5.想法:
我對第一題想法是,我以為這是一般的射子彈題@@
F = nmV = 10*0.05*600 = 300 N
但跟答案差了十倍@@ 我不知道是不是哪裡有漏啥觀念
第二題的話,因第一題的後座力是300N向後,所以施予240牛頓向前時,
仍有60N的後座力,所以
合力= nmV
-> 300-240 = n * 0.05 * 600 -> n = 2
但怎麼跟答案完全不一樣...請各位高手指點了,謝謝><
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推
03/11 13:14, , 1F
03/11 13:14, 1F
推
03/11 13:15, , 2F
03/11 13:15, 2F
→
03/11 13:17, , 3F
03/11 13:17, 3F
→
03/11 13:18, , 4F
03/11 13:18, 4F
推
03/11 13:28, , 5F
03/11 13:28, 5F
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03/11 13:29, , 6F
03/11 13:29, 6F
→
03/11 14:33, , 7F
03/11 14:33, 7F
推
03/11 15:07, , 8F
03/11 15:07, 8F
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03/11 15:07, , 9F
03/11 15:07, 9F
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03/11 15:08, , 10F
03/11 15:08, 10F
→
03/11 15:10, , 11F
03/11 15:10, 11F
推
03/11 15:36, , 12F
03/11 15:36, 12F
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03/11 15:37, , 13F
03/11 15:37, 13F
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03/11 15:38, , 14F
03/11 15:38, 14F
→
03/11 15:38, , 15F
03/11 15:38, 15F
→
03/11 15:39, , 16F
03/11 15:39, 16F
推
03/11 15:51, , 17F
03/11 15:51, 17F
推
03/11 16:37, , 18F
03/11 16:37, 18F
→
03/11 16:37, , 19F
03/11 16:37, 19F
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03/11 16:38, , 20F
03/11 16:38, 20F
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03/11 16:38, , 21F
03/11 16:38, 21F
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03/11 16:39, , 22F
03/11 16:39, 22F
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03/11 16:39, , 23F
03/11 16:39, 23F
→
03/11 16:40, , 24F
03/11 16:40, 24F
推
03/11 17:00, , 25F
03/11 17:00, 25F
→
03/11 17:00, , 26F
03/11 17:00, 26F
推
03/11 17:04, , 27F
03/11 17:04, 27F
→
03/11 17:05, , 28F
03/11 17:05, 28F
→
03/11 17:06, , 29F
03/11 17:06, 29F
推
03/11 17:10, , 30F
03/11 17:10, 30F
→
03/11 17:11, , 31F
03/11 17:11, 31F
推
03/11 17:11, , 32F
03/11 17:11, 32F
推
03/11 18:06, , 33F
03/11 18:06, 33F
→
03/11 18:07, , 34F
03/11 18:07, 34F
→
03/11 18:08, , 35F
03/11 18:08, 35F
→
03/11 18:08, , 36F
03/11 18:08, 36F
→
03/11 18:08, , 37F
03/11 18:08, 37F
→
03/11 18:09, , 38F
03/11 18:09, 38F
→
03/11 18:09, , 39F
03/11 18:09, 39F
→
03/11 18:09, , 40F
03/11 18:09, 40F
→
03/11 18:10, , 41F
03/11 18:10, 41F
→
03/11 18:10, , 42F
03/11 18:10, 42F
→
03/11 18:10, , 43F
03/11 18:10, 43F
→
03/11 18:11, , 44F
03/11 18:11, 44F
→
03/11 18:11, , 45F
03/11 18:11, 45F
推
03/11 21:58, , 46F
03/11 21:58, 46F
→
03/11 21:58, , 47F
03/11 21:58, 47F
推
03/11 23:12, , 48F
03/11 23:12, 48F
推
03/11 23:20, , 49F
03/11 23:20, 49F
→
03/11 23:20, , 50F
03/11 23:20, 50F
→
03/11 23:22, , 51F
03/11 23:22, 51F
→
03/11 23:24, , 52F
03/11 23:24, 52F
→
03/11 23:25, , 53F
03/11 23:25, 53F
→
03/11 23:25, , 54F
03/11 23:25, 54F
推
03/11 23:26, , 55F
03/11 23:26, 55F
推
03/11 23:27, , 56F
03/11 23:27, 56F
→
03/11 23:27, , 57F
03/11 23:27, 57F
→
03/11 23:28, , 58F
03/11 23:28, 58F
→
03/11 23:29, , 59F
03/11 23:29, 59F
→
03/11 23:45, , 60F
03/11 23:45, 60F
推
03/12 02:22, , 61F
03/12 02:22, 61F
→
03/12 02:22, , 62F
03/12 02:22, 62F
推
03/12 02:24, , 63F
03/12 02:24, 63F
→
03/12 02:24, , 64F
03/12 02:24, 64F
推
03/12 02:27, , 65F
03/12 02:27, 65F
→
03/12 02:27, , 66F
03/12 02:27, 66F
推
03/12 03:26, , 67F
03/12 03:26, 67F
推
03/12 10:17, , 68F
03/12 10:17, 68F
→
03/12 10:17, , 69F
03/12 10:17, 69F
→
03/12 12:44, , 70F
03/12 12:44, 70F
→
03/12 12:44, , 71F
03/12 12:44, 71F
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