初二物理计算题（密度）2道题!!! 初二求二十道物理计算题：速度和密度的，各十道，要问题+答案 ...
\u6025\u970012\u9053\u521d\u4e8c\u7269\u7406\u5bc6\u5ea6\u8ba1\u7b97\u9898\u548c8\u9053\u901f\u5ea6\u8ba1\u7b97\u9898\uff08\u6709\u7b54\u6848\u7684\uff09\u671f\u672b\u7269\u7406\u590d\u4e60\uff08\u5bc6\u5ea6\u8ba1\u7b97\u9898\uff09
\u8d28\u91cf\u4e3a9\u5343\u514b\u7684\u51b0\u5757\uff0c\u5bc6\u5ea6\u4e3a0.9\u00d7103\u5343\u514b\uff0f\u7c733\uff0e\u6c42\u51b0\u5757\u7684\u4f53\u79ef\uff1f\u51b0\u5757\u7194\u5316\u6210\u6c34\u540e\uff0c\u4f53
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2. \u91d1\u5c5e\u7684\u8d28\u91cf\u662f6750\u5343\u514b\uff0c\u4f53\u79ef\u662f2.5\u7c733\u8fd9\u5757\u91d1\u5c5e\u7684\u5bc6\u5ea6\u662f\u591a\u5c11\uff1f\u82e5\u5c06\u8fd9\u5757\u91d1\u5c5e\u622a\u53bb2/3\uff0c\u5269\u4e0b\u90e8\u5206\u7684\u5bc6\u5ea6\u662f\uff1f
3.\u94c1\u7684\u5bc6\u5ea6\u662f7.8\u00d710 3\u5343\u514b/\u7c733\uff0c20\u5206\u7c733\u94c1\u5757\u7684\u8d28\u91cf\u662f\u591a\u5c11\uff1f
4\u4e00\u4e2a\u74f6\u5b50\u88c5\u6ee1\u6c34\u65f6,\u603b\u8d28\u91cf\u4e3a1.3\u5343\u514b.\u88c5\u6ee1\u7164\u6cb9\u65f6,\u603b\u8d28\u91cf\u4e3a1.14\u5343\u514b.\u6c42\u7a7a\u74f6\u7684\u8d28\u91cf.\uff1f
5\u77e5\u51b0\u7684\u5bc6\u5ea6\u4e3a0.9\u00d7103Kg/m3\uff0c\u5219\u4e00\u5757\u4f53\u79ef\u4e3a80 cm3\u7684\u51b0\u5168\u90e8\u7194\u5316\u4e3a\u6c34\u540e\uff0c\u6c34\u7684\u8d28\u91cf\u662f\u591a\u5c11g\uff0c\u6c34\u7684\u4f53\u79ef\u662f\u591a\u5c11cm3.
6\uff0e\u67d0\u516c\u56ed\u8981\u94f8\u4e00\u5c0a\u94dc\u50cf\uff0c\u5148\u7528\u6728\u6750\u5236\u6210\u4e00\u5c0a\u4e0e\u94dc\u50cf\u5927\u5c0f\u4e00\u6837\u7684\u6728\u6a21\uff0c\u73b0\u6d4b\u5f97\u6728\u6a21\u8d28\u91cf\u4e3a63Kg\uff0c\uff08\u03c1\u6728=0.7\u00d7103Kg/m3\uff0c\u03c1\u94dd=8.9\u00d7103Kg/m3\uff09\u95ee\uff1a\u9700\u8981\u591a\u5c11\u5343\u514b\u94dc\u624d\u80fd\u94f8\u6210\u6b64\u94dc\u50cf\uff1f
7.\u6709\u4e00\u79cd\u7eaa\u5ff5\u5e01\uff0c\u5b83\u7684\u8d28\u91cf\u662f16.1\u514b\uff0e\u4e3a\u4e86\u6d4b\u91cf\u5b83\u7684\u4f53\u79ef\uff0c\u628a\u5b83\u653e\u5165\u4e00\u76db\u6ee1\u6c34\u7684\u91cf\u7b52\u4e2d\uff0c\u6d4b\u5f97\u6ea2\u51fa\u7684\u6c34\u8d28\u91cf\u4e3a1\uff0e8\u514b\u3002\uff081\uff09\u6c42\u5236\u4f5c\u7eaa\u5ff5\u5e01\u7684\u91d1\u5c5e\u5bc6\u5ea6\uff1b\uff082\uff09\u8bf4\u8fd9\u79cd\u91d1\u5c5e\u7684\u540d\u79f0\u3002
8\uff0e\u90d1\u5c0f\u80d6\u5bb6\u7684\u4e00\u53ea\u74f6\u5b50\uff0c\u4e700.5kg\u9152\u521a\u597d\u88c5\u6ee1\u3002\u5c0f\u80d6\u7528\u8fd9\u53ea\u74f6\u5b50\u53bb\u4e700.5kg\u9171\u6cb9\uff0c\u7ed3\u679c\u6ca1\u6709\u88c5\u6ee1\uff0c\u5c0f\u80d6\u4ee5\u4e3a\u8425\u4e1a\u5458\u5f04\u9519\u4e86\u3002\u73b0\u5728\u8bf7\u4f60\u601d\u8003\u4e00\u4e0b\uff0c\u5230\u5e95\u662f\u8c01\u5f04\u9519\u4e86\uff1f\uff08\u03c1\u9152=0.8\u00d7103 kg/m3\uff0c\u03c1\u9171\u6cb9=1.13\u00d7103 kg/m3\uff09
9.\u4e00\u7a7a\u74f6\u88c5\u6ee1\u6c34\u540e\u8d28\u91cf\u4e3a64g\uff0c\u5c06\u6c34\u5012\u51fa\u88c5\u6ee1\u9152\u7cbe\u4e3a56g\uff0c\u6c42\u7a7a\u74f6\u7684\u5bb9\u79ef\uff1f
10. \u4f53\u79ef\u662f50cm3\u7684\u94dd\u7403\uff0c\u5b83\u7684\u8d28\u91cf\u662f54g\uff0c\u95ee\u8fd9\u4e2a\u94dd\u7403\u662f\u7a7a\u5fc3\u7684\u8fd8\u662f\u5b9e\u5fc3\u7684\uff1f\u82e5\u662f\u7a7a\u5fc3\u7684\uff0c\u7a7a\u5fc3\u90e8\u5206\u4f53\u79ef\u4e3a\u591a\u5927\uff1f\uff08\u03c1\u94dd\uff1d2.7\u00d7103kg/m3\uff09
11.\u4e00\u4e2a\u74f6\u5b50\u80fd\u76db1\u5343\u514b\u6c34\uff0c\u7528\u8fd9\u4e2a\u74f6\u5b50\u80fd\u76db\u591a\u5c11\u5343\u514b\u9152\u7cbe\uff1f
12. \u6709\u4e00\u7a7a\u74f6\u5b50\u8d28\u91cf\u662f50\u514b\uff0c\u88c5\u6ee1\u6c34\u540e\u79f0\u5f97\u603b\u8d28\u91cf\u4e3a250\u514b\uff0c\u88c5\u6ee1\u53e6\u4e00\u79cd\u6db2\u4f53\u79f0\u5f97\u603b\u8d28\u91cf\u4e3a200\u514b\uff0c\u6c42\u8fd9\u79cd\u6db2\u4f53\u7684\u5bc6\u5ea6\u3002
13.\u67d0\u540c\u5b66\u4ece\u4e00\u5747\u5300\u5927\u5ca9\u77f3\u4e0a\u7838\u4e0b\u4e00\u5c0f\u5757\u5ca9\u77f3\uff0c\u7528\u5929\u5e73\u79f0\u5f97\u8d28\u91cf\u662f27g\u3002\u653e\u5165\u88c5\u670980ml\u6c34\u7684\u91cf\u7b52\u4e2d\uff0c\u6c34\u9762\u5347\u523090ml\uff0c\u8fd9\u5757\u5ca9\u77f3\u7684\u5bc6\u5ea6\u662f\u591a\u5c11kg/m3
14.\u5c0f\u660e\u5728\u5b66\u6821\u8fd0\u52a8\u4f1a\u4e0a\u83b7\u5f97\u4e00\u5757\u5956\u724c\uff0c\u4ed6\u60f3\u77e5\u9053\u8fd9\u5757\u5956\u724c\u662f\u5426\u7531\u7eaf\u94dc\u5236\u6210\uff0c\u4e8e\u662f\u4ed6\u7528\u5929\u5e73\u548c\u91cf\u676f\u5206\u522b\u6d4b\u51fa\u8be5\u5956\u724c\u7684\u8d28\u91cf\u548c\u4f53\u79ef\u4e3a14g\u548c2cm3\uff0c\u5e76\u7b97\u51fa\u4ed6\u7684\u5bc6\u5ea6\u4e3a\u591a\u5c11g/cm3\uff1f\u5c0f\u660e\u901a\u8fc7\u67e5\u5bc6\u5ea6\u8868\u77e5\u9053\uff0c\u94dc\u7684\u5bc6\u5ea6\u4e3a8.9\u00d7103kg/m3\uff0c\u7531\u6b64\u4ed6\u5224\u65ad\u8be5\u5956\u724c_____\u7531\u7eaf\u94dc\u5236\u6210\u7684\uff08\u9009\u586b\u201c\u662f\u201d\u6216\u201c\u4e0d\u662f\u201d\uff09\u3002
15.\u4e00\u4e2a\u91cf\u7b52\uff0c\u5185\u88c580\u6beb\u5347\u9152\u7cbe\uff0c\u603b\u8d28\u91cf\u662f144\u514b\u3002\u82e5\u5c06\u9152\u7cbe\u5012\u51fa\u6539\u88c5\u6c34\uff0c\u603b\u8d28\u91cf\u662f124\u514b\uff0c\u95ee\uff081\uff09\u91cf\u7b52\u7684\u8d28\u91cf\u662f\u591a\u5c11\u514b\uff1f\uff082\uff09\u91cf\u7b52\u5185\u88c5\u4e86\u591a\u5c11\u6beb\u5347\u6c34\uff1f\uff08\u03c1\u6c34=1.0\u00d7103\u5343\u514b/\u7c733\u3001\u03c1\u9152\u7cbe=0.8\u00d7103\u5343\u514b/\u7c733\uff09
16. \uff0e\u5c0f\u660e\u5728\u73a9\u800d\u65f6\u628a\u4e00\u5c0f\u94c1\u7403\u629b\u5165\u6c34\u4e2d\uff0c\u4ed6\u53d1\u73b0\u94c1\u7403\u6d6e\u5728\u6c34\u9762\u4e0a.\u5c0f\u660e\u60f3\uff1a\u94c1\u7403\u4e3a\u4ec0\u4e48\u6d6e\u5728\u6c34\u9762\u4e0a\uff1f\u4ed6\u4f5c\u51fa\u7684\u731c\u60f3\u662f\uff1a\u94c1\u7403\u53ef\u80fd\u662f\u7a7a\u5fc3\u7684\u3002\u4ed6\u60f3\u8bbe\u8ba1\u5b9e\u9a8c\u8fdb\u884c\u63a2\u7a76\uff0c\u4ed6\u9700\u8981\u7684\u5b9e\u9a8c\u5668\u6750\u5e94\u8be5\u6709
\u901a\u8fc7\u5b9e\u9a8c\u4ed6\u6536\u96c6\u5230\u5982\u4e0b\u6570\u636e\uff1a
\u94c1\u7403\u7684\u8d28\u91cfm/g \u6c34\u7684\u4f53\u79efV\u6c34/ml \u6c34\u548c\u94c1\u7403\u7684\u603b\u4f53\u79efV\u603b/ml
79 60 75
(1)\u8be5\u5c0f\u94c1\u7403\u662f\u7a7a\u5fc3\u7684\uff0c\u8fd8\u662f\u5b9e\u5fc3\u7684\uff1f\u5199\u51fa\u4f9d\u636e\u3002
(2)\u82e5\u5c0f\u94c1\u7403\u662f\u7a7a\u5fc3\u7684\uff0c\u7a7a\u5fc3\u90e8\u5206\u7684\u4f53\u79ef\u662f\u591a\u5927\uff1f
17\uff0e\u201c\u4e4c\u9e26\u559d\u6c34\u201d\u7684\u6545\u4e8b\u4f60\u4e0d\u964c\u751f\u5427\uff0e\u5982\u56fe\u6240\u793a\uff0c\u82e5\u6709\u4e00\u53ea\u5bb9\u79ef\u4e3a3\u00d710-4m3\u7684\u74f6\u5185\u76db\u67090.2kg\u7684\u6c34\uff0c\u4e00\u53ea\u53e3\u6e34\u7684\u4e4c\u9e26\u6bcf\u6b21\u5c06\u4e00\u5757\u8d28\u91cf\u4e3a10g\u7684\u5c0f\u77f3\u5b50\u6295\u5165\u74f6\u4e2d\uff0c\u5f53\u4e4c\u9e26\u6295\u5165\u4e8625\u5757\u76f8\u540c\u7684\u5c0f\u77f3\u5b50\u540e\uff0c\u6c34\u9762\u5347\u5230\u74f6\u53e3\uff0c\u6c42\uff1a\uff081\uff09\u74f6\u5185\u77f3\u5757\u7684\u603b\u4f53\u79ef\uff1b\uff082\uff09\u77f3\u5757\u7684\u5bc6\u5ea6\uff0e
18\uff0e\u6709\u4e00\u79cd\u7eaa\u5ff5\u5e01\uff0c\u5b83\u7684\u8d28\u91cf\u662f16.1\u514b\uff0e\u4e3a\u4e86\u6d4b\u91cf\u5b83\u7684\u4f53\u79ef\uff0c\u628a\u5b83\u653e\u5165\u4e00\u76db\u6ee1\u6c34\u7684\u91cf\u7b52\u4e2d\uff0c\u6d4b\u5f97\u6ea2\u51fa\u7684\u6c34\u91cd\u4e3a1.8\u00d710\uff0d2\u725b\uff0e
\uff081\uff09\u6c42\u5236\u4f5c\u7eaa\u5ff5\u5e01\u7684\u91d1\u5c5e\u5bc6\u5ea6\uff1b
\uff082\uff09\u8bf4\u8fd9\u79cd\u91d1\u5c5e\u7684\u540d\u79f0\uff1b
\uff083\uff09\u76db\u6ee1\u6c34\u7684\u91cf\u7b52\u5728\u653e\u5165\u7eaa\u5ff5\u5e01\u7684\u524d\u540e\u5206\u522b\u7528\u5929\u5e73\u53bb\u79f0\u91cf\uff0c\u8ba1\u7b97\u793a\u6570\u7684\u53d8\u5316\u91cf\u3002
19\uff0e\u6211\u56fd\u7ea6\u67094\u4ebf\u591a\u4eba\u914d\u5e26\u8fd1\u89c6\u773c\u955c,\u773c\u955c\u7684\u4e3b\u8981\u6750\u6599\u7684\u90e8\u5206\u6280\u672f\u6307\u6807\u5982\u4e0b\u8868:
\u6750\u6599 \u6811\u8102\u955c\u7247 \u73bb\u7483\u955c\u7247 \u94dc\u5408\u91d1 \u949b\u5408\u91d1
\u900f\u5149\u91cf 92% 91%
\u5bc6\u5ea6/kg•m-3 1.3\u00d7103 2.5\u00d7103 8.0\u00d7103 4.5\u00d7103
\u6027\u80fd \u8f83\u8010\u78e8\u635f \u8010\u78e8\u635f \u8f83\u8010\u78e8\u635f \u8010\u8150\u8680
\uff081\uff09\u6c42\u4e00\u5757\u4f53\u79ef\u4e3a4\u00d710-6m3\u73bb\u7483\u955c\u7247\u7684\u8d28\u91cf\u4e3a\u591a\u5c11?
\uff082\uff09 \u5982\u56fe12\u6240\u793a,\u4e00\u526f\u94dc\u5408\u91d1\u67b6\u7684\u8d28\u91cf\u4e3a2\u00d710-2kg,\u82e5\u4ee5\u949b\u5408\u91d1\u4ee3\u66ff\u94dc\u5408\u91d1,\u6c42\u4e00\u526f\u4ee5\u949b\u5408\u91d1\u955c\u67b6\u7684\u8d28\u91cf.
20\uff0e\u8001\u677f\u6d3e\u5c0f\u59da\u53bb\u8ba2\u8d2d\u9152\u7cbe\uff0c\u5408\u540c\u4e0a\u8981\u6c42\u9152\u7cbe\u7684\u5bc6\u5ea6\u5c0f\u4e8e\u6216\u8005\u662f\u7b49\u4e8e0.82g/cm3\u5c31\u7b97\u8fbe\u6807\uff0c\u5c0f\u59da\u5728\u62bd\u6837\u68c0\u67e5\u65f6\uff0c\u53d6\u9152\u7cbe\u7684\u6837\u672c500ml\uff0c\u79f0\u5f97\u7684\u8d28\u91cf\u662f420g. \u8bf7\u4f60\u901a\u8fc7\u8ba1\u7b97\u8bf4\u660e\u5c0f\u59da\u7684\u7ed3\u8bba\u662f (A \u8fbe\u6807 B \u4e0d\u8fbe\u6807\uff0c\u542b\u6c34\u592a\u591a) \u4f60\u8ba4\u4e3a\u5c0f\u59da\u8be5\u600e\u4e48\u529e?
(\u03c1\u9152=0.8\u00d7103 kg/m3 \u03c1\u6c34=1.0\u00d7103 kg/m3)
21\uff0e. \u5b9e\u9a8c\u5ba4\u6709\u4e0b\u5217\u56db\u79cd\u91cf\u7b52\uff0c\u5206\u522b\u6807\u6709\u6700\u5927\u523b\u5ea6\u503c\u548c\u6700\u5c0f\u523b\u5ea6\u503c\uff0c\u8981\u4e00\u6b21\u8f83\u51c6\u786e\u91cf\u51fa100 g\u5bc6\u5ea6\u4e3a0.8\u00d7103 kg/m3\u7684\u9152\u7cbe\uff0c\u5219\u9009\u7528\u7684\u91cf\u7b52\u5e94\u8be5\u662f \uff08 \uff09
A\u3001500ml 10ml B\u3001 100ml 2ml C\u3001250ml 5ml D\u300150ml 2ml
22\uff0e\u67d0\u540c\u5b66\u7528\u4e00\u53ea\u73bb\u7483\u676f\uff0c\u6c34\u548c\u5929\u5e73\u6d4b\u4e00\u5757\u77f3\u5b50\u7684\u5bc6\u5ea6\u3002\u4ed6\u628a\u676f\u5b50\u88c5\u6ee1\u6c34\u540e\u79f0\u5f97\u603b\u8d28\u91cf\u662f200g\uff0c\u653e\u5165\u77f3\u5b50\u540e\uff0c\u5c06\u6c34\u6ea2\u51fa\u4e00\u90e8\u5206\u4ee5\u540e\u79f0\u5f97\u603b\u8d28\u91cf\u662f215g\uff0c\u628a\u77f3\u5b50\u4ece\u676f\u4e2d\u53d6\u51fa\uff0c\u79f0\u5f97\u6c34\u548c\u676f\u5b50\u7684\u8d28\u91cf\u4e3a190g\uff0c\u6c42\u77f3\u5b50\u7684\u5bc6\u5ea6\u3002
23\uff0e\u5c0622g\u76d0\u5b8c\u5168\u6eb6\u89e3\u5728\u5982\u56fe13\u7532\u6240\u793a\u7684\u91cf\u7b52\u5185\u7684\u6c34\u4e2d\uff0c\u6db2\u9762\u5347\u9ad8\u540e\u7684\u4f4d\u7f6e\u5982\u56fe\u4e59\u6240\u793a\u3002\u5219\u76d0\u6c34\u7684\u7684\u5bc6\u5ea6\u4e3a\u591a\u5c11\uff1f
\u5c0f\u4e3d\u540c\u5b66\u7684\u89e3\u7b54\u662f\u8fd9\u6837\uff1a
\u89e3\uff1a\u03c1=m/v=22g\u00f710\u339d3=2.2g/\u339d3=2.2\u00d7103kg/m3\u3002
\u5c0f\u4e3d\u540c\u5b66\u7684\u89e3\u7b54\u662f\u5426\u6b63\u786e\uff0c\u8bf7\u4f60\u505a\u51fa\u8bc4\u4ef7\u3002\u5982\u679c\u6709\u9519\u8bef\uff0c\u8bf7\u5199\u51fa\u6b63\u786e\u7684\u8fc7\u7a0b\u3002
\u7b54\u6848
\uff081\uff09\u5df2\u77e5\uff1am\uff08\u51b0\uff09=9\u338f p(\u51b0\uff09=0.9\u00d710³\u338f\u2215m³ p(\u6c34\uff09=1\u00d710³\u338f\u2215m³
\u6c42\uff1aV\uff08\u51b0\uff09\uff0c V\uff08\u6c34\uff09
\u89e3\uff1aV\uff08\u51b0\uff09= m\uff08\u51b0\uff09\uff0f p(\u51b0\uff09=9\u338f\uff0f0.9\u00d710³\u338f\u2215m³ =10\uff0d²m³
V\uff08\u6c34\uff09= m\uff08\u51b0\uff09\u00d7\uff0fp(\u6c34\uff09=9\u338f\uff0f1\u00d710³\u338f\u2215m³ =9\u00d7 10\uff0d³m³
\u7b54\uff1b\u51b0\u5757\u7684\u4f53\u79ef\u662f10\uff0d²m³\uff0c \u51b0\u5757\u7194\u5316\u6210\u6c34\u540e\uff0c\u4f53
\u79ef\u662f9\u00d7 10\uff0d³m³\u3002
\u56de\u7b54\u4eba\u7684\u8865\u5145 2009-12-30 23:35
(2\uff09\u5df2\u77e5\uff1am=6750\u338f V=2.5m³
\u6c42\uff1ap
\u89e3\uff1ap=m\uff0fv=6750\u338f\uff0f2.5m³=2.7\u00d710³\u338f\uff0fm³
\u7b54\uff1a\u8fd9\u5757\u91d1\u5c5e\u7684\u5bc6\u5ea6\u662f2.7\u00d710³\u338f\uff0fm³\u82e5\u5c06\u8fd9\u5757\u91d1\u5c5e\u622a\u53bb2/3\uff0c\u5269\u4e0b\u90e8\u5206\u7684\u5bc6\u5ea6\u662f2.7\u00d710³\u338f\uff0fm³\u3002
(3)\u5df2\u77e5\uff1ap=7.8\u338f\u00d710³\uff0fm³ V=20dm³=2\u00d710\uff0d²m³
\u6c42\uff1am
\u89e3\uff1bm=p\u00d7v=7.8\u338f\u00d710³\uff0fm³ \u00d7 2\u00d710\uff0d²m³ =156\u338f
\u7b54\uff1a\u94c1\u5757\u7684\u8d28\u91cf\u662f156\u338f
\uff085\uff09\u5df2\u77e5\uff1ap(\u51b0\uff09=0.9\u00d710³\u338f\uff0fm³ =0.9g\uff0f cm³ p(\u6c34\uff09=1g\u2215cm³ V(\u51b0\uff09=80 cm³
\u6c42\uff1am(\u6c34\uff09V(\u6c34\uff09
\u89e3\uff1am(\u6c34\uff09=m(\u51b0\uff09=p(\u51b0\uff09\u00d7V(\u51b0\uff09=0.9g\uff0f cm³ \u00d780 cm³\uff1d72g
V(\u6c34\uff09=m(\u6c34\uff09\uff0fp(\u6c34\uff09=72g\uff0f1g\u2215cm³ =72 cm³
\u7b54\uff1a\u6c34\u7684\u8d28\u91cf\u662f72g\uff0c\u6c34\u7684\u4f53\u79ef\u662f72cm³\u3002
\uff086\uff09\u5df2\u77e5\uff1a
m(\u6728)= 63Kg \u03c1\u6728=0.7\u00d710³Kg/m3\uff0c\u03c1\u94dc=8.9\u00d710³Kg/m3
\u6c42\uff1am{\u94dc}
\u89e3\uff1aV(\u94dc)= V(\u6728)= m(\u6728) \uff0f\u03c1\u6728= 63Kg\uff0f0.7\u00d710³Kg/m3=9\u00d710\u2227-2 m³
m(\u94dc)= \u03c1\u94dc\u00d7V(\u94dc)=8 .9\u00d710³Kg/m3\u00d79\u00d710\u2227-2 m³=801\u338f
\u7b54\uff1a\u9700\u8981801\u5343\u514b\u94dc\u624d\u80fd\u94f8\u6210\u6b64\u94dc\u50cf
\uff087\uff09\u5df2\u77e5\uff1am\u91d1=16.1g m\u6c34=1.8g p(\u6c34\uff09=1g\u2215cm³
\u6c42\uff1aV\u91d1=V\u6c34= m\u6c34\uff0fp(\u6c34\uff09=1.8g\uff0f1g\u2215cm³=1.8cm³
P\u91d1=m\u91d1\uff0fV\u91d1=16.1g\uff0f1.8cm³\u22488.9 g\u2215cm³
\u7b54\uff1a\u6c42\u5236\u4f5c\u7eaa\u5ff5\u5e01\u7684\u91d1\u5c5e\u5bc6\u5ea68.9 g\u2215cm³\uff0c\u8fd9\u79cd\u91d1\u5c5e\u7684\u540d\u79f0\u662f\u94dc.\u3002
\u6c42(8)\u5df2\u77e5\uff1am\u9152=0.5\u338f m\u9171=0.5\u338f \u03c1\u9152=0.8\u00d710³ kg/m3\uff0c\u03c1\u9171\u6cb9=1.13\u00d710³ kg/m3
\uff1aV\u9152 V\u9171
\u89e3\uff1a\u2235V\u9152= m\u9152\uff0f\u03c1\u9152\uff1d0.5\u338f\uff0f0.8\u00d710³ kg/m3\uff1d6.25\u00d710\u2227\uff0d4m³
V\u9171= m\u9171\uff0f\u03c1\u9171\u6cb9\uff1d0.5\u338f\uff0f1.13\u00d710³ kg/m3\u22484.42\u00d710\u2227\uff0d4m³
\u2234V\u9152\uff1eV\u9171
\u2234\u9171\u6cb9\u6ca1\u6709\u88c5\u6ee1
\u7b54\uff1a\u5c0f\u80d6\u5f04\u9519\u4e86\u3002
(9)\u5df2\u77e5\uff1am\uff08\u7a7a\uff0b\u6c34\uff5d=64g m(\u7a7a|\uff0b\u9152)=56g p(\u6c34\uff09=1g\u2215cm³ \u03c1\u9152=0.8g\uff0fcm ³
\u6c42\uff1aV\u7a7a
\u89e3\uff1a\u2235m\uff08\u7a7a\uff0b\u6c34\uff5d=64g m(\u7a7a|\uff0b\u9152)=56g
\u2234m\uff08\u7a7a\uff09= m\uff08\u7a7a\uff0b\u6c34\uff5d\uff0fm(\u7a7a|\uff0b\u9152) \uff1d64g\uff0d56g=8g
\u03c1\uff08\u7a7a\uff09\uff1dp(\u6c34\uff09\uff0d\u03c1\u9152\uff1d1g\u2215cm³ \uff0d0.8g\uff0fcm³=0.2 g\u2215cm³
\u2234V\u7a7a\uff1dm\uff08\u7a7a\uff09\uff0f\u03c1\uff08\u7a7a\uff09\uff1d8g\uff0f0.2 g\u2215cm³=40cm³
\u7b54\uff1a\u7a7a\u74f6\u7684\u5bb9\u79ef\u662f40cm³
\uff0810\uff09\u5df2\u77e5\uff1aV1=50cm³ m1=54g \u03c1\u94dd\uff1d2.7\u00d710³kg/m3\uff1d2.7 g\uff0fcm³
\u6c42\uff1a\u94dd\u7403\u662f\u7a7a\u5fc3\u7684\u8fd8\u662f\u5b9e\u5fc3\uff0c\u82e5\u662f\u7a7a\u5fc3\u7684\uff0c\u7a7a\u5fc3\u90e8\u5206\u4f53\u79ef
\u89e3\uff1a\u2235\u03c11= m1\uff0fV1\uff1d54g\uff0f50cm³\uff1d1.08g\uff0fcm³
\u2234\u03c11\uff1c\u03c1\u94dd
\u2234\u94dd\u7403\u662f\u7a7a\u5fc3\u7684
v\u94dd= V1
m\u94dd\uff1d\u03c1\u94dd\u00d7V1\uff1d2.7 g\uff0fcm³\u00d750cm³\uff1d135g
m2= m\u94dd\uff0dm1=135g\uff0d54g\uff1d81g
\u03c12=\u03c11\uff1d1.08g\uff0fcm³
V2= m2\uff0f\u03c11\uff1d81g\uff0f1.08g\uff0fcm³\uff1d75 cm³
\u7b54\uff1a\u8fd9\u4e2a\u94dd\u7403\u662f\u7a7a\u5fc3\uff0c\u7a7a\u5fc3\u90e8\u5206\u4f53\u79ef\u4e3a75 cm³\u3002
\uff0811\uff09\u5df2\u77e5\uff1am\u6c34=1\u338f p\u6c34=1\u00d710³\u338f\uff0fm³ p\u9152=0.8\u00d710³ kg/³
\u6c42\uff1am\u9152
\u89e3\uff1aV\u9152=V\u74f6=V\u6c34= m\u6c34\uff0fp\u6c34\uff1d1\u338f\uff0f1\u00d710³\u338f\uff0fm³\uff1d1\u00d710\u2227\uff0d3m³
m\u9152\uff1dp\u9152\u00d7V\u9152\uff1d0.8\u00d710³ kg/³\u00d71\u00d710\u2227\uff0d3m³\uff1d0.8\u338f
\u7b54\uff1a\u7528\u8fd9\u4e2a\u74f6\u5b50\u80fd\u76db0.8\u5343\u514b\u9152\u7cbe\u3002
\uff0812\uff09\u5df2\u77e5\uff1am\u7a7a=50g m\u6c34=m\u603b\u2014m\u7a7a=250g\uff0d50g\uff1d200g
m2= m\u603b\u2014m\u7a7a\uff1d200g-50g=150g p(\u6c34\uff09=1g\u2215cm³
\u6c42\uff1ap2
\u89e3\uff1aV2=V\u7a7a=V\u6c34= m\u6c34\uff0fp\u6c34\uff1d200g \uff0f1g\u2215cm³=200cm³
p2\uff1dm2\uff0fV2\uff1d150g\uff0f200cm³\uff1d0.75 g\u2215cm³
\u7b54\uff1a\u8fd9\u79cd\u6db2\u4f53\u7684\u5bc6\u5ea6\u662f0.75 g\u2215cm³\u3002
\uff0813\uff09\u5df2\u77e5\uff1am=27g V=90ml\uff0d80ml=10ml
\u6c42\uff1ap
\u89e3\uff1ap\uff1dm\uff0fV=27g\uff0f10ml=2.7 g\u2215cm³=2.7\u00d710 ³\u338f\uff0fm ³
\u7b54\uff1a\u8fd9\u5757\u5ca9\u77f3\u7684\u5bc6\u5ea6\u662f2.7\u00d710 ³\u338f\uff0fm ³.
(14)\u5df2\u77e5\uff1am=14g V=2cm³
\u6c42\uff1ap
\u89e3\uff1a\u2235p=m\uff0fv=14g\uff0f2cm³=7 g\u2215cm³=7\u00d710 ³\u338f\uff0fm ³
\u2234p\uff1cp\u94dc
\u7b54\uff1a\u4ed6\u7684\u5bc6\u5ea6\u4e3a7\u00d710 ³\u338f\uff0fm ³\uff0c\u8be5\u5956\u724c__\u4e0d\u662f___\u7531\u7eaf\u94dc\u5236\u6210\u7684
1\uff0e\u6bcf\u8282\u6cb9\u7f50\u8f66\u7684\u5bb9\u79ef\u4e3a50m3\uff0c\u4ece\u6cb9\u7f50\u4e2d\u53d6\u51fa20cm3\u7684\u6cb9\uff0c\u8d28\u91cf\u4e3a17\u514b\uff0c\u4e00\u6ee1\u7f50\u7684\u6cb9\u7684\u8d28\u91cf\u662f\u591a\u5c11\u5428?
2\uff0e\u8f66\u95f4\u5b89\u88c5\u7535\u8def\u8981\u7528\u6a2a\u622a\u9762\u79ef\u4e3a25mm2\u7684\u94dc\u5bfc\u7ebf8000m\uff0c\u5e94\u8d2d\u4e70\u94dc\u5bfc\u7ebf\u591a\u5c11\u5343\u514b?(\u03c1\u94dc =8.9\u00d7103 kg / m3 )
3\uff0e\u4e00\u4e2a\u7a7a\u74f6\u8d28\u91cf\u4e3a200g \uff0c\u88c5\u6ee1\u6c34\u65f6\u603b\u8d28\u91cf\u4e3a700g\uff0c\u82e5\u7528\u6765\u88c5\u53e6\u4e00\u79cd\u6db2\u4f53\uff0c\u88c5\u6ee1\u540e\u603b\u8d28\u91cf\u662f600g\uff0c\u9274\u522b\u8fd9\u79cd\u6db2\u4f53\u7684\u79cd\u7c7b\u3002
4. \u4f53\u79ef\u662f30cm3\u7684\u94dd\u7403\uff0c\u8d28\u91cf\u662f27g\uff0c\u8fd9\u4e2a\u94dd\u7403\u662f\u7a7a\u5fc3\u7684\u8fd8\u662f\u5b9e\u5fc3\u7684?
\u7b54\u6848\uff1a
1\uff0e\u6bcf\u8282\u6cb9\u7f50\u8f66\u7684\u5bb9\u79ef\u4e3a50m3\uff0c\u4ece\u6cb9\u7f50\u4e2d\u53d6\u51fa20cm3\u7684\u6cb9\uff0c\u8d28\u91cf\u4e3a17\u514b\uff0c\u4e00\u6ee1\u7f50\u7684\u6cb9\u7684\u8d28\u91cf\u662f\u591a\u5c11\u5428?
p=m/v
m=17g=0.017kg,v=20cm^3=20*10^(-6)m^3
\u90a3\u4e48\u6cb9\u7684\u5bc6\u5ea6\u662fp=0.017/[20*10^(-6)]=0.85*10^3kg/m^3
V=50m^3
\u5373\u603b\u7684\u8d28\u91cf\u662f\uff1am=pV=0.85*10^3*50=42.5*10^3kg=42.5\u5428
2\uff0e\u8f66\u95f4\u5b89\u88c5\u7535\u8def\u8981\u7528\u6a2a\u622a\u9762\u79ef\u4e3a25mm2\u7684\u94dc\u5bfc\u7ebf8000m\uff0c\u5e94\u8d2d\u4e70\u94dc\u5bfc\u7ebf\u591a\u5c11\u5343\u514b?(\u03c1\u94dc =8.9\u00d7103 kg / m3 )
\u4f53\u79efv=l*s=8000m*25*10^(-6)m^2=0.2m^3
\u5e94\u8be5\u4e70\u7684\u8d28\u91cf\u662fm=pv=8.9*10^3*0.2=1.78*10^3kg
3\uff0e\u4e00\u4e2a\u7a7a\u74f6\u8d28\u91cf\u4e3a200g \uff0c\u88c5\u6ee1\u6c34\u65f6\u603b\u8d28\u91cf\u4e3a700g\uff0c\u82e5\u7528\u6765\u88c5\u53e6\u4e00\u79cd\u6db2\u4f53\uff0c\u88c5\u6ee1\u540e\u603b\u8d28\u91cf\u662f600g\uff0c\u9274\u522b\u8fd9\u79cd\u6db2\u4f53\u7684\u79cd\u7c7b\u3002
\u6c34\u8d28\u91cf\u662fm1=700-200=500g=0.5kg
\u74f6\u7684\u4f53\u79ef=\u6c34\u4f53\u79efv=m/p=0.5/10^3=0.5*10^(-3)m^3
\u53e6\u4e00\u79cd\u6db2\u4f53\u7684\u8d28\u91cf\u662fm2=600-200=400g=0.4kg
\u5bc6\u5ea6p=m2/v=0.4/[0.5*10^(-3)]=0.8*10^3kg/m^3
\u6240\u4ee5\u662f\u9152\u7cbe\u3002
4. \u4f53\u79ef\u662f30cm3\u7684\u94dd\u7403\uff0c\u8d28\u91cf\u662f27g\uff0c\u8fd9\u4e2a\u94dd\u7403\u662f\u7a7a\u5fc3\u7684\u8fd8\u662f\u5b9e\u5fc3\u7684?
\u5982\u679c\u662f\u5b9e\u5fc3\uff0c\u5219\u8d28\u91cf\u662fm=pv=2.7*10^3*30*10^(-6)=81*10^(-3)kg=81g>27g
\u6240\u4ee5\u662f\u7a7a\u5fc3\u7684\u3002
\u7528\u5f39\u7c27\u6d4b\u529b\u8ba1\u6d4b\u4e00\u7269\u5757\uff0c\u5176\u91cd\u4e3a9.8N\uff0c\u82e5\u628a\u7269\u5757\u7684\u4e00\u534a\u6d78\u6ca1\u4e8e\u6c34\u4e2d\uff0c\u5f39\u7c27\u6d4b\u529b\u8ba1\u7684\u8bfb\u6570\u4e3a7.84N\u3002
1\uff09\u8fd9\u79cd\u7269\u5757\u7684\u5bc6\u5ea6\u662f\u591a\u5c11\uff1f
2\uff09\u8fd9\u79cd\u7269\u5757\u653e\u5165\u6c34\u94f6\u4e2d\u662f\u4e0a\u6d6e\u8fd8\u662f\u4e0b\u6c89\uff1f\u4e3a\u4ec0\u4e48\uff1f
3\uff09\u82e5\u628a\u7269\u5757\u5168\u90e8\u6d78\u6ca1\u5982\u7164\u6cb9\u4e2d\uff0c\u5f39\u7c27\u6d4b\u529b\u8ba1\u7684\u8bfb\u6570\u5c06\u53d8\u4e3a\u591a\u5927?
\u5bc6\u5ea6=\u8d28\u91cf/\u4f53\u79ef
\u91cd\u529b=\u8d28\u91cfX9.8
\u8d28\u91cf=\u91cd\u529b/9.8
\u56e0\u4e3a\u7269\u5757\u4e00\u534a\u6d78\u6ca1\u5728\u6c34\u4e2d\u6240\u53d7\u6d6e\u529b=\u6c34\u7684\u5bc6\u5ea6X\u6392\u5f00\u6c34\u7684\u4f53\u79ef
\u7531\u6d4b\u529b\u8ba1\u8bfb\u6570\u5f97\u77e5\u6240\u53d7\u6d6e\u529b=9.8N-7.84N
\u6392\u5f00\u6c34\u7684\u4f53\u79ef=\u6d6e\u529b/\u6c34\u7684\u5bc6\u5ea6
\u6c34\u7684\u5bc6\u5ea6\u662f\u5df2\u77e5\u91cf\uff0c\u6c42\u5f97\u6392\u5f00\u6c34\u7684\u4f53\u79ef
\u6392\u5f00\u6c34\u7684\u4f53\u79efX2\u7b49\u4e8e\u7269\u5757\u7684\u4f53\u79ef
\u81f3\u6b64\u53ef\u4ee5\u6c42\u5f97\u7269\u5757\u7684\u5bc6\u5ea6
\u5728\u6c34\u94f6\u4e2d\u4e0a\u6d6e\u8fd8\u662f\u4e0b\u6c89\u5c31\u662f\u4e24\u8005\u7684\u5bc6\u5ea6\u6bd4\u8f83\u4e86\u7269\u5757\u5bc6\u5ea6\u5927\u4e8e\u6c34\u94f6\u5bc6\u5ea6\u5373\u4e0b\u6c89\u53cd\u4e4b\u4e0a\u6d6e
\u5168\u90e8\u6d78\u5165\u7164\u6cb9\u4e2d\u6839\u636e\u6d6e\u529b\u516c\u5f0fF=\u7164\u6cb9\u5bc6\u5ea6X\u7269\u5757\u4f53\u79ef
\u7136\u540e\u75289.8-F\u5c31\u662f\u6d4b\u529b\u8ba1\u7684\u8bfb\u6570\u4e86\u3002
\u7528\u76d0\u6c34\u9009\u79cd\uff0c\u9700\u8981\u5bc6\u5ea6\u4e3a1100kg/m3\uff0c\u73b0\u914d\u7f6e\u670950dm3\u7684\u76d0\u6c34\u3002\u79f0\u5f97\u5176\u8d28\u91cf\u4e3a60kg\uff0c\u8fd9\u6837\u7684\u6c34\u662f\u5426\u7b26\u5408\u8981\u6c42?\u82e5\u4e0d\u7b26\u5408\uff0c\u5e94\u52a0\u76d0\u8fd8\u662f\u6c34\uff0c\u52a0\u591a\u5c11\uff1f
\u89e3\uff1a60kg\u9664\u4ee50.05m3\u662f1200kg/m3 \u5927\u4e8e\u6240\u9700\u5bc6\u5ea6\uff0c\u52a0\u6c34
\u8bbe\u52a0\u6c34\u7684\u4f53\u79ef\u4e3axm3,\u5219\u6c34\u7684\u8d28\u91cf\u4e3a1000xkg,
(60+1000x)kg/(0.05+x)m3=1100kg/m3,\u6c42\u51fax\uff0c\u4e58\u4ee51000\u5219\u4e3a\u6c34\u7684\u8d28\u91cf
\u4e00\u6346\u94dc\u4e1d\u7684\u8d28\u91cf\u662f17.8\u5343\u514b,\u94dc\u4e1d\u7684\u622a\u9762\u79ef\u662f2\u5e73\u65b9\u6beb\u7c73,\u8fd9\u6346\u94dc\u4e1d\u7684\u957f\u5ea6\u662f\u591a\u5c11?(P\u4e3a\u5bc6\u5ea6,P\u94dc=8900\u5343\u514b/\u7acb\u65b9\u7c73)
\u89e3\uff1aP=M/V \u5148\u6c42\u51faV=0.002m³
0.002m³=2000000\u7acb\u65b9\u6beb\u7c73
2000000/2\u5c31\u5f97\u5230\u957f\u5ea6\u4e86 =1*10\u76846\u6b21\u65b9
\u4e00\u4e2a\u77f3\u8721\u96d5\u5851\u7684\u8d28\u91cf\u4e3a4.5\u5343\u514b\uff0c\u73b0\u6d47\u94f8\u4e00\u4e2a\u540c\u6837\u5927\u5c0f\u7684\u94dc\u96d5\u5851\uff0c\u81f3\u5c11\u9700\u8981\u591a\u5c11\u5343\u514b\u94dc\uff1f\uff08\u94dc\u7684\u5bc6\u5ea6\u4e3a\uff1a8.9*10^3kg/\u7acb\u65b9\u7c73\u3002\u8721\u7684\u5bc6\u5ea6\u4e3a\uff1a0.9*10^3kg/\u7acb\u65b9\u7c73
\u89e3\uff1a(4.5kg/0.9*10^3kg/\u7acb\u65b9\u7c73)*(8.9*10^3kg/\u7acb\u65b9\u7c73)
\u4e3a\u4e86\u4fdd\u62a4\u73af\u5883\uff0c\u6cbb\u7406\u6c34\u571f\u6d41\u5931\uff0c\u5b66\u6821\u7684\u73af\u4fdd\u5c0f\u7ec4\u6d4b\u5b9a\u4e86\u5c71\u6d2a\u51b2\u5237\u5730\u9762\u65f6\u6d2a\u6c34\u7684\u542b\u6c99\u91cf\u3002\uff08\u5373\u6bcf\u7acb\u65b9\u7c73\u7684\u6d2a\u6c34\u6240\u542b\u6ce5\u6c99\u7684\u8d28\u91cf\uff09\uff0c\u6cbb\u7406\u73af\u5883\u4e4b\u524d\uff0c\u4ed6\u4eec\u5171\u91c7\u96c6\u4e8640\u7acb\u65b9\u5206\u7c73\u7684\u6c34\u6837\uff0c\u79f0\u5176\u603b\u8d28\u91cf\u4e3a40.56\u5343\u514b\uff0c\u5df2\u77e5\u5e72\u71e5\u6ce5\u6c99\u7684\u5bc6\u5ea6\u4e3a2.4*10\u4e09\u6b21\u65b9/\u7acb\u65b9\u7c73\uff0c\u6c42\u6d2a\u6c34\u4e2d\u7684\u542b\u6c99\u91cf\u662f\u591a\u5c11\u5343\u514b\uff1f
\u3010\u89e3\u3011\u8bbe\u6b64\u5904\u6c34\u7684\u542b\u6c99\u91cf\u4e3ax
V\u6c34+V\u6c99=0.04
\u03c1\u6c34V\u6c34+\u03c1\u6c99V\u6c99=40.56kg
\u6240\u4ee5\uff1a
V\u6c34+V\u6c99=0.04
1000V\u6c34+2400V\u6c99=10.18kg
\u89e3\u5f97\uff1a
V\u6c99=0.0004
m\u6c99=2400\u00d70.0004=0.96kg
0.96/0.04=24
\u542b\u6c99\u91cf\u662f24kg
\u4e00\u5757\u4f53\u79ef\u4e3a100\u7acb\u65b9\u5398\u7c73\u7684\u51b0\u878d\u5316\u6210\u6c34\u540e,\u8d28\u91cf\u591a\u5927?
\u89e3\uff1ap\u51b0\u7b49\u4e8e0.9\u514b/\u5398\u7c73³
1.
M\u6c34=M\u51b0=0.9*100=90\u514b
\u4e00\u5757\u8d28\u91cf\u4e3a100\u514b\u7684\u51b0\u6eb6\u5316\u6210\u6c34\u540e,\u4f53\u79ef\u591a\u5927?
M\u51b0=M\u6c34=p\u6c34V\u6c34
V\u6c34=M\u51b0/p\u6c34=100/1=100\u7acb\u65b9\u5398\u7c73
1 \u6709\u4e00\u6ee1\u74f6\u6cb9,\u6cb9\u548c\u74f6\u7684\u603b\u8d28\u91cf\u662f1.46kg,\u74f6\u7684\u8d28\u91cf\u662f500g,\u74f6\u7684\u5bb9\u79ef\u662f1.2\u7acb\u65b9dm.\u6c42\u6cb9\u7684\u5bc6\u5ea6?
\u5206\u6790\uff1a\u74f6\u7684\u5bb9\u79ef\u662f1.2\u7acb\u65b9\u5206\u7c73\u5c31\u662f\u6cb9\u7684\u4f53\u79ef\uff0c\uff08\u8fd9\u662f\u4e00\u4e2a\u9690\u542b\u6761\u4ef6\uff0c\u9898\u76ee\u4e2d\u8bf4\u4e00\u6ee1\u74f6\u6cb9\uff0c \u8868\u793a\u6cb9\u7684\u4f53\u79ef\u5c31\u662f\u74f6\u7684\u5bb9\u79ef \uff09\uff1b\u6cb9\u7684\u8d28\u91cfm\u6cb9\uff1dm\u603b-m\u74f6=1.46kg\uff0d0.5kg\uff1d0.96kg\uff1b\u518d\u7528 \u03c1\uff1dm/v \u5c31\u53ef\u4ee5\u6c42\u51fa\u6cb9\u7684\u5bc6\u5ea6\u3002
\u5df2\u77e5\uff1am\u603b=1.46kg
m\u74f6=500g=0.5kg
v\u74f6=1.2dm^3=1.2*10^-3m^3
\u6c42\u03c1\u6cb9.
\u89e3\uff1a\u6cb9\u7684\u8d28\u91cfm\u6cb9\uff1dm\u603b-m\u74f6=1.46kg\uff0d0.5kg\uff1d0.96kg
v\u6cb9=v\u74f6=1.2dm^3=1.2*10^-3m^3
\u6cb9\u7684\u5bc6\u5ea6\u5c31\u662f
\u03c1\u6cb9=m/v
=(m\u603b-m\u74f6)/v\u6cb9
=(1.46kg-0.5kg)/1.2*10^-3m^3
=0.8\u00d710^3(kg/m^3)
\u7b54\uff1a\uff08\u7565\uff09
2 \u6709\u4e00\u575720\u7c733\u7684\u77ff\u77f3\uff0c\u4e3a\u4e86\u6d4b\u51fa\u5b83\u7684\u8d28\u91cf\uff0c\u4ece\u5b83\u4e0a\u9762\u53d610\u5398\u7c733\u6837\u54c1\uff0c\u6d4b\u5f97\u6837\u54c1\u7684\u8d28\u91cf\u4e3a26\u514b\uff0c\u6839\u636e\u4ee5\u4e0a\u6570\u636e\u6c42\u51fa\u77ff\u77f3\u7684\u5bc6\u5ea6\u548c\u8d28\u91cf\uff1f
2\u30026\u00d7103\u5343\u514b/\u7c733 52\u5428
3 \u5728\u5bb6\u4e2d\u6ca1\u6709\u91cf\u7b52\uff0c\u53ea\u6709\u4e00\u4e2a\u5f39\u7c27\u6d4b\u529b\u8ba1\u3001\u4e00\u4e2a\u7a7a\u77ff\u6cc9\u6c34\u74f6\uff08\u6709\u76d6\u513f\uff09\u3001\u7ec6\u7ef3\u548c\u4e00\u4e9b\u6c34\uff0c\u8bbe\u6cd5\u6d4b\u51fa\u98df\u7528\u6cb9\u7684\u5bc6\u5ea6\uff0c\u5199\u51fa\u7b80\u8981\u7684\u6d4b\u91cf\u6b65\u9aa4\uff0c\u5199\u51fa\u98df\u7528\u6cb9\u5bc6\u5ea6\u7684\u8868\u8fbe\u5f0f\uff08\u7528\u6240\u6d4b\u91cf\u5b57\u6bcd\u8868\u793a\uff09\u3002
\u5b9e\u9a8c\u6b65\u9aa4\uff1a
\uff081\uff09 \u7528\u7ec6\u7ef3\u7cfb\u597d\u7a7a\u74f6\uff0c\u518d\u7528\u5f39\u7c27\u6d4b\u529b\u8ba1\u6d4b\u51fa\u7a7a\u74f6\u6240\u53d7\u91cd\u529bG0\uff0c\u5c06\u74f6\u4e2d\u704c\u6ee1\u6c34\uff0c\u62e7\u7d27\u74f6\u76d6\uff0c\u7528\u5f39\u7c27\u6d4b\u529b\u8ba1\u6d4b\u51fa\u74f6\u548c\u6c34\u5171\u53d7\u91cd\u529bG1\uff0c\u5219\u6c34\u7684\u8d28\u91cf\u4e3am\u6c34= G1\u2014G0
\uff082\uff09 \u7531\u516c\u5f0fV\u6c34= m\u6c34/\u03c1\u6c34\u8ba1\u7b97\u51fa\u6c34\u7684\u4f53\u79efV\u6c34=\uff08G1\u2014G0\uff09/\u03c1\u6c34
\uff083\uff09 \u5c06\u6c34\u5012\u51fa\uff0c\u518d\u5f80\u74f6\u4e2d\u5012\u6ee1\u6cb9\uff0c\u7528\u5f39\u7c27\u6d4b\u529b\u8ba1\u6d4b\u51fa\u74f6\u548c\u6cb9\u5171\u53d7\u91cd\u529bG2\uff0c\u5219\u6c34\u7684\u8d28\u91cf\u4e3am\u6cb9=
\uff084\uff09V\u6cb9=
\uff085\uff09\u5219\u98df\u7528\u6cb9\u7684\u5bc6\u5ea6\u03c1\u6cb9=
\uff083\uff09\u5c06\u6c34\u5012\u51fa\uff0c\u518d\u5f80\u74f6\u4e2d\u5012\u6ee1\u6cb9\uff0c\u7528\u5f39\u7c27\u6d4b\u529b\u8ba1\u6d4b\u51fa\u74f6\u548c\u6cb9\u5171\u53d7\u91cd\u529bG2\uff0c\u5219\u6c34\u7684\u8d28\u91cf\u4e3am\u6cb9= G2\u2014G0
\uff084\uff09\uff08G1\u2014G0\uff09/\u03c1\u6c34
\uff085\uff09\uff08G2\u2014G0\uff09\u03c1\u6c34/\uff08G1\u2014G0\uff09
\u4e00\u4e2a\u5c0f\u74f6\u6ee1\u6c34\u65f6\u7684\u8d28\u91cf\u662f180\u514b\uff0c\u5982\u73b0\u5728\u74f6\u4e2d\u653e\u5165\u4e00\u5757\u8d28\u91cf\u4e3a32\u514b\u7684\u91d1\u5c5e\u5757\u540e\u518d\u88c5\u6ee1\u6c34\uff0c\u5219\u79f0\u5f97\u8d28\u91cf\u4e3a208\u514b\uff0c\u8fd9\u5757\u91d1\u5c5e\u7684\u5bc6\u5ea6\u662f\u591a\u5927
\u91d1\u5c5e\u5757\u7684\u4f53\u79ef\u7b49\u4e8e\u589e\u52a0\u6c34\u7684\u4f53\u79ef\u4e3a
(208g-180g)*1.0g/cm3=28cm3
\u91d1\u5c5e\u5757\u7684\u5bc6\u5ea6\u4e3a
\u03c1\u91d1=m\u91d1/V=32g/28cm3=1.14g/cm3
\u4e00\u4ef6\u5de5\u827a\u54c1\u7528\u91d1\u548c\u94dc\u5236\u6210\uff0c\u5b83\u7684\u8d28\u91cf\u662f20kg\uff0c\u4f53\u79ef\u662f18dm^3,\u6c42\u8fd9\u4ef6\u5de5\u827a\u54c1\u4e2d\u91d1\u3001\u94dc\u7684\u8d28\u91cf\u5404\u662f\u591a\u5c11\u514b\uff1f\uff08\u91d1\u7684\u5bc6\u5ea6\u662f8.9*10kg/m^3,\u94dc\u7684\u5bc6\u5ea6\u662f19.3*10^3kg/m^3\uff09
\u8bbe\u91d1X\u514b \u94dcY\u514b
X+Y=20
X/8\u30029*10^3+Y/19\u30023*10^3=18
\u613f\u91c7\u7eb3\uff0c\u8fd9\u4e2a\u5e26\u6709\u7b54\u6848\u54e6\uff0cO(\u2229_\u2229)O\u8c22\u8c2223|\u8bc4\u8bba(14)
V(铁)=m(铁)/ρ(铁)=3.12kg/7.8*10^3kg/m^3=4*10^-4(m^3)=0.4(dm^3)
V空=V-V(铁)=0.9-0.4=0.5(dm^3)
m(水)=ρ(水)*V空=1kg/dm^3*0.5=0.5kg
m总=m水+m铁=0.5+3.12=3.65kg
2.
设铜的体积为x(cm^3)
8.9*x+2.7*(20-x)=116
所以x=10(cm^3)
所以
m(铜)=8.9*x=8.9*10=89g
m(铝)=2.7*(20-x)=2.7*10=27g
1.m=3.12/(7.8×10的立方kg/立方米)=0.4立方分米
v空心部分=0.9-0.4=0.5立方分米
m=3.12+0.0005*1*10的立方=3.62kg
2.m铜球=20*8.9=178g
178-116=62g
v铝=62/(8.9-2.7)=10立方cm
m铜=10*8.9=89g
m铝=10*2.7=27g
1.设空心部分体积诶V（立方分米），于是实际体积为0.9-V
有： 3.12=（0.9-V）*7.8 得V=0.41（立方分米）
2.列方程
方程1：m铜+m铝=116
方程2：m铜/ρ铜+m铝/ρ铝=20
很抱歉,如果我有时间,我定会帮你
绛旓細m(閾)=2.7*(20-x)=2.7*10=27g
绛旓細鏂规硶涓锛氭眰瀹為檯瀵嗗害锛毾=m/v=27g/20cm3=1.25g/cm3<2.7g/cm3锛屽洜姝ゆ槸绌哄績鐨勩傛柟娉曚簩锛氭眰璐ㄩ噺锛氬亣璁炬鐞冩槸瀹炲績鐨勶紝鍒欒川閲忓簲涓簃=蟻V=2.7g/cm3脳20cm3=54g>27g,鍥犳鏄┖蹇冪殑銆傦紙鍚屾牱澶х殑閾佺悆锛屾垜杩欎釜瀹炲績鐨勮川閲忔湁54g锛岃棰樼洰涓殑鍙湁27g锛岃鏄庡畠鏄┖蹇冪殑锛夋柟娉曚笁锛氭眰浣撶Н锛氬亣璁炬鐞冩槸瀹...
绛旓細1锛夎繖绉嶇墿鍧楃殑瀵嗗害鏄灏戯紵2锛杩欑鐗╁潡鏀惧叆姘撮摱涓槸涓婃诞杩樻槸涓嬫矇锛熶负浠涔堬紵3锛夎嫢鎶婄墿鍧楀叏閮ㄦ蹈娌″鐓ゆ补涓紝寮圭哀娴嬪姏璁＄殑璇绘暟灏嗗彉涓哄澶? 瀵嗗害=璐ㄩ噺/浣撶Н 閲嶅姏=璐ㄩ噺X9.8 璐ㄩ噺=閲嶅姏/9.8 鍥犱负鐗╁潡涓鍗婃蹈娌″湪姘翠腑鎵鍙楁诞鍔=姘寸殑瀵嗗害X鎺掑紑姘寸殑浣撶Н 鐢辨祴鍔涜璇绘暟寰楃煡鎵鍙楁诞鍔=9.8N-7.84N 鎺掑紑姘寸殑浣撶Н...
绛旓細1銆佺摱瀛愮殑瀹圭Н涓簐锛岀摱瀛愯川閲忎负m 鍒 m+m姘=320g m+m鐓ゆ补=280g 锛屾按鍜岀叅娌圭殑瀵嗗害鏌ラ槄璇炬湰鍙互寰楀埌锛岄偅涔堬細m+蟻姘*v=320g m+蟻鐓ゆ补*v=280g 鑱旂珛鏂圭▼瑙ｅ緱v=200cm^3 m=120g 2銆佺摱瀛愮殑瀹圭Н涓簐锛岀摱瀛愯川閲忎负100g 鐢辩摱鍜屾按鎬昏川閲忎负500鍏嬪彲寰楁按鐨勮川閲忔槸400g锛屽洜姝ょ摱瀛愬绉痸=m/蟻姘...
绛旓細鏈変笁绉嶆柟娉曪細 (1)鏍规嵁瀵嗗害鏉ュ垽鏂 鐢毕=m/v=178 g/40 cm3=4锛45g/cm3=4锛45脳103kg/m3<蟻閾 鎵浠ラ摐鐞冩槸绌哄績鐨勶紟 (2)鏍规嵁璐ㄩ噺鏉ュ垽鏂 鍋囪閾滅悆鏄疄蹇冪殑鍒欏叾璐ㄩ噺m=蟻v=8锛9 g/cm3脳40 cm3=356 g>178g 鎵浠ラ摐鐞冩槸绌哄績鐨勶紟 (3)鏍规嵁浣撶Н鏉ュ垽鏂 閾滅悆涓摐鐨勪綋绉痸=m/蟻=178 g/8锛9 g...
绛旓細瀵嗗害鐨勫簲鐢1锛庢湁涓涓摱瀛愯婊℃补鏃讹紝鎬昏川閲忔槸1.2kg锛岃婊℃按鏃舵昏川閲忔槸1.44kg锛屾按鐨勮川閲忔槸1.2kg锛屾眰娌圭殑瀵嗗害锛2锛庡皬鐡跺唴鐩涙弧姘村悗绉板緱璐ㄩ噺涓210g锛岃嫢鍦ㄧ摱鍐呭厛鏀句竴涓45g鐨勯噾灞炲潡鍚庯紝鍐嶈婊℃按锛岀О寰楃殑璐ㄩ噺涓251g锛屾眰閲戝睘鍧楃殑瀵嗗害锛3锛庝袱绉嶉噾灞炵殑瀵嗗害鍒嗗埆涓猴紝鍙栬川閲忕浉鍚岀殑杩欎袱绉嶉噾灞炲仛鎴愬悎閲戯紝璇...
绛旓細婧㈠嚭鐨勬按鐨勮川閲弇1=700+445-1095=50g 鍒欓噾灞炵殑浣撶НV=50(cm3)瀵嗗害=445/50=8.9g/cm3 2.鍏堟祴鍑虹┖鐡惰川閲廙,鍦ㄦ祴鍑轰竴婊＄摱姘+鐡剁殑璐ㄩ噺M1,鍜屼竴婊＄摱娌+鐡剁殑璐ㄩ噺M2,姘寸殑瀵嗗害p1=1g/cm3,娌圭殑瀵嗗害p2 鍒檖2/p1=(M1-M)/(M2-M1)
绛旓細0g鈭昪m3=500cm3閲戝睘棰楃矑鐨勮川閲忎负m=1000g-200g=800g閲戝睘棰楃矑缂濋殭闂存按鐨勮川閲忎负m2=1410g-1000g=410g閲戝睘棰楃矑闂寸紳闅欑殑浣撶Н涓篤2=m2蟻姘=410g1.0g鈭昪m 3=410cm3閲戝睘棰楃矑鐨勪綋绉负V=V1-V2=500cm3-410cm3=90cm3閲戝睘棰楃矑鐨瀵嗗害涓合=mV=800g90cm3鈮8.9g/cm3=8.9脳103kg/m3绛旓細閲戝睘棰楃矑鐨勫瘑搴...
绛旓細绛旓細杩欎釜閲戝睘鐞冪殑瀵嗗害鏄10.25*10^3kg/m^3 2銆傝В锛氾紙1锛夌敱棰樻剰鍙煡 V姘=V閰掔簿 璁剧┖鐡惰川閲忎负m鐡 鍒(320g-m)/1g/cm^3=(280g-m)/0.8g/cm^3 320g-m=350g-1.25m 0.25m=30g m=120g 锛2锛鐡跺瓙鐨勫绉 V=(280g-120g)/0.8g/cm^3 V=200cm^3 绛旓細绌虹摱鐨勮川閲忔槸120g锛岀摱鐨勫绉槸...
绛旓細(1)璇锋牴鎹皬绾㈢殑瀹為獙缁撴灉璁＄畻宸ヨ壓鍝佺殑瀵嗗害 (2)璇锋牴鎹敭璐у憳鐨勮娉,璁＄畻鍑哄伐鑹哄搧鐨勫瘑搴,骞惰鏄庡敭璐у憳鐨勮瘽鏄惁鍙俊 (3)璇疯绠楄繖浠跺伐鑹哄搧鐨勫疄闄呭惈閲戦噺 锛1锛夊瘑搴鏄 600/52=11.54g/cm3 (2锛閲戙侀摐鐨勮川閲忓垎鍒槸 300g 閭ｄ箞宸ヨ壓鍝佺殑瀵嗗害搴旇鏄600/锛300/19.3+300/8.9锛= 12.18g/cm3 鎵浠ヨ...
