初二物理有关密度的计算的几道题目 初二物理密度计算练习题
\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
\u79ef\u591a\u5927\uff1f
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
http://www.cbe21.com/subject/physics/printer.php?article_id=1792
\u8fd9\u91cc\u9762\u6709\u54e6 \u800c\u4e14\u90fd\u4e0d\u5bb9\u6613
2.不同物质，m1:m2=ρ1:ρ2(密度比）
3.不同物质，v1:v2=ρ2:ρ1(密度的反比)
根据m=ρV。
物理其实不难，我是高二理科生，以前物理都是致命科，后来找到了诀窍，成绩就上来了。物理的核心内容就是公式，万变不离其宗。所有的题都是那一个共式的变形。充分理解公式，做题就基本没有难度了。认真听讲是根本，多做题，每道题都要吃透，多问、多思。
这一章计算要小心。
先弄清公式的来龙去脉，要格物致知，不要不求甚解。
加油，看你挺善问的。不要灰心。跨过这道坎。
（1）V1:V2
（2）p1:p2
（3）p2:p1
只要记住公式：p=m/V就行了。
比如第一题：
p1=m1/V1，p2=m2/V2
因为p1=p2
所以m1/V1=m2/V2
所以m1/m2=V1/V2
（1）V1:V2
（2）P1:P2
（3）P2:P1
其实就是公式p=m/v，定一个量，带入比一下就知道了。
根据p=m/v. p一定可得m1/v1=m2/v2得到m1：m2=v1/v2.同理v一定，m1：m2=p1/p2。第三个v与p成反比。v1：v2=p2：p1。
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锛夌摱瀛愮殑瀹圭Н 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...
绛旓細浠栨妸璐ㄩ噺涓350鍏嬬殑鐜嬪啝娌夋病鍦ㄦ按涓椂锛屾湁22.5鍘樼背3鐨勬按琚帓鍑猴紝閭ｄ箞鑳介壌瀹氬嚭杩欓《鐜嬪啝鏄函閲戝埗鎴愮殑鍚楋紵涓轰粈涔堬紵濡傛灉鍚庢潵鍒朵綔鐜嬪啝鐨勪汉鎵胯浜嗭紝浠栧湪鍒朵綔鏃舵幒杩涗簡鐧介摱锛岄偅涔璁＄畻涓涓嬪湪鐜嬪啝閲屼粬鎺鸿繘浜嗗灏戠櫧閾讹紵锛堥噾鐨瀵嗗害鏄19.3脳103Kg/m3锛岄摱鐨勫瘑搴︽槸10.5脳103Kg/m3锛5銆佹湁涓涓川閲忎负5鍗冨厠鐨勫悎閲...
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绛旓細1.V姘=M/p=130g/ 1g/cm^3= 130cm^3 v绌=250cm^3-130cm^3=120cm^3 10g=0.01kg v鐭=mshi/PSHI=0.01kg/ 2.5锛10锛3kg/m^3 =0.000000004m^3=4cm^3 鏁伴噺=V绌/V鐭=120cm^3 /4cm^3=30鍧 2.瑙:璁剧摱瀛愮殑璐ㄩ噺涓簒g 鐢变簬鐡跺瓙浣撶Н涓嶅彉锛屾墍浠ュ彲寰楁柟绋 P姘=1g/m^3 P閰掔簿...
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绛旓細1 鏈変竴婊＄摱娌,娌瑰拰鐡剁殑鎬昏川閲忔槸1.46kg,鐡剁殑璐ㄩ噺鏄500g,鐡剁殑瀹圭Н鏄1.2绔嬫柟dm.姹傛补鐨瀵嗗害? 鍒嗘瀽:鐡剁殑瀹圭Н鏄1.2绔嬫柟鍒嗙背灏辨槸娌圭殑浣撶Н,(杩欐槸涓涓殣鍚潯浠,棰樼洰涓涓婊＄摱娌, 琛ㄧず娌圭殑浣撶Н灏辨槸鐡剁殑瀹圭Н );娌圭殑璐ㄩ噺m娌=m鎬-m鐡=1.46kg-0.5kg=0.96kg;鍐嶇敤 蟻=m/v 灏卞彲浠ユ眰鍑烘补鐨勫瘑搴︺ 宸茬煡:m鎬=...
绛旓細=20cm³7.鍜岀鍏鍋氭硶涓鏍凤紝绌哄績鐨勪綋绉负160cm³濡傛灉鍦ㄧ┖蹇冮儴鍒嗘敞婊℃按鍚庯紝鎬昏川閲忔槸540g+160*1=700g 8.瑁呮按鐨勪綋绉负锛15-10锛/1=5 娌圭殑瀵嗗害=锛11-10锛/5=0.2g/cm³9.鏂规硶鍜岀鍏涓鏍凤紝姘寸殑浣撶Н涓200 杩欑娑蹭綋鐨勫瘑搴=锛300-50锛/200=1.25g/cm³
绛旓細鍥犳鐡跺瓙瀹圭Нv=m/蟻姘=400cm^3 鐢辩摱鍜岄噾灞為绮掔殑鎬昏川閲忎负990鍏嬪彲寰楅噾灞炶川閲=990g-m=890g 閲戝睘棰楃矑鍜屾按鐨勬昏川閲忓鏋滄槸1.29鍗冨厠灏辫鏄棰樼洰鏈韩鏈夐棶棰橈紝鍥犱负杩欐椂閲戝睘璐ㄩ噺890g锛屾按璐ㄩ噺绛変簬1290g-990g=300g锛岀劧鍚庢眰姘寸殑浣撶НV锛岄噾灞炵殑浣撶НV閲戯紝閲戝睘棰楃矑瀵嗗害鍙互寰楀埌鍟︺傘
绛旓細6.閾佺悆瀵嗗害蟻 蟻=m/v=1580g/500cm^3=3.16g/cm^3=3.16x10^3kg/m^3<7.9x10^3kg/m^3 鏄┖蹇冪殑 閾佺殑浣撶НV=m/蟻閾=1580g/7.9g/cm^3=200cm^3 绌哄績閮ㄥ垎浣撶Нv'=500-200=300cm^3 閰掔簿璐ㄩ噺 m'=蟻'v'=0.8x300=240g 鎬昏川閲廙=m+m'=1580+240=1820g=1.82kg ...
