\u540d\u5e2b\u7e3d\u7d50\uff1a\u4e2d\u8003\u7269\u7406\u6d6e\u529b\u6bd4\u4f8b\u898f\u5f8b<\/title> \n<\/head><\/p>\n<body><\/p>\n<table width=\"92%\" align=\"center\" border=\"0\" cellpadding=\"0\" cellspacing=\"0\">\n<tbody>\n<tr>\n<td height=\"37\">\n<div align=\"center\">\n<h1><a href=\"http:\/\/tutor.howang.hk\/\">\u88dc\u7fd2<\/strong><\/a>-\u540d\u5e2b\u7e3d\u7d50\uff1a\u4e2d\u8003\u7269\u7406\u6d6e\u529b\u6bd4\u4f8b\u898f\u5f8b<\/h1>\n<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#f7f7f7\" height=\"20\">\n<div align=\"center\">http:\/\/tutor.howang.hk\/-<a href=\"http:\/\/tutor.howang.hk\/\">\u9999\u6e2f\u88dc\u7fd2\u57ce<\/strong><\/a><\/strong><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td align=\"center\" height=\"1\">\n<hr width=\"95%\" noshade=\"noshade\" size=\"1\" \/><\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"right\"><\/div>\n <a href=\"http:\/\/tutor.howang.hk\/\">\u88dc\u7fd2\u4ecb\u7d39<\/a><\/b><\/p>\n\u3000\u3000\u6d6e\u529b\u77e5\u8b58\u7d9c\u5408\u6027\u5f37\uff0c\u61c9\u7528\u8d77\u4f86\u65b9\u6cd5\u6bd4\u8f03\u9748\u6d3b\uff0c\u540c\u5b78\u5011\u4e0d\u59a8\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\u3002<\/p>\n\u3000\u3000\u4e00\u3001\u8a08\u7b97\u6d6e\u529b\u7684\u5169\u500b\u91cd\u8981\u7684\u6bd4\u4f8b\u63a8\u8ad6\uff1a<\/p>\n\u3000\u30001\u3001\u7269\u9ad4\u6f02\u6d6e\u6642\uff1aF\u6d6e=G\u7269 <\/p>\n\u3000\u3000ρ\u6db2gV\u6392=ρ\u7269gV\u7269\uff0c-=-<\/p>\n\u3000\u3000\u61c9\u7528\uff1a\u4e00\u6728\u584a\u6f02\u6d6e\u5728\u6c34\u9762\uff0c\u67092\/5\u9ad4\u7a4d\u9732\u51fa\u6c34\u9762\uff0c\u6c42\u6728\u584a\u5bc6\u5ea6\u3002<\/p>\n\u3000\u3000\u2235 -=-=3\/5 <\/p>\n\u3000\u3000∴ρ\u6728=-ρ\u6c34=0.6×103\u5343\u514b\/\u7c733<\/p>\n\u3000\u30002\u3001\u7269\u9ad4\u5168\u6d78\u6642\uff1aF\u6d6e=ρ\u6db2gV\u6392<\/p>\n\u3000\u3000G\u7269=ρ\u7269gV\u7269\uff0c-=-<\/p>\n\u3000\u3000\u61c9\u7528\uff1a\u4e00\u7269\u9ad4\u5728\u7a7a\u6c23\u4e2d\u7528\u5f48\u7c27\u79e4\u7a31\u91cf\uff0c\u793a\u6578\u70ba245N\uff1b\u5168\u90e8\u6d78\u6c92\u6c34\u4e2d\u540e\uff0c\u5f48\u7c27\u79e4\u7684\u793a\u6578\u70ba49N\uff1b\u6c42\u7269\u9ad4\u5bc6\u5ea6\u3002<\/p>\n\u3000\u3000F\u6d6e=G\u7269-F\u6d6e=245-49=196N<\/p>\n\u3000\u3000\u2235-=-=196\/245=4\/5<\/p>\n\u3000\u3000∴ρ\u7269=-ρ\u6c34=1.25×103\u5343\u514b\/\u7c733<\/p>\n\u3000\u3000\u7279\u9ede\uff1a\u8a08\u7b97\u5feb\u901f\u6e96\u78ba\uff0c\u898f\u5f8b\u8a18\u61b6\u6df1\u523b\u3002<\/p>\n\u3000\u3000\u4e8c\u3001\u6c42\u6d6e\u529b\u7684\u65b9\u6cd5\uff1a<\/p>\n\u3000\u30001\u3001F\u6d6e=F\u5411\u4e0aF\u5411\u4e0b(\u58d3\u529b\u5dee\u6cd5)\u6d6e\u529b\u7522\u751f\u539f\u56e0\u3002<\/p>\n\u3000\u3000\u9069\u7528\uff1a\u5f62\u72c0\u898f\u5247\uff0c\u53ef\u4ee5\u627e\u5230\u4e0a\u4e0b\u8868\u9762\u7684\u7269\u9ad4\u3002<\/p>\n\u3000\u30002\u3001F\u6d6e=G\u7269F\u6d6e(\u793a\u6578\u5dee\u6cd5)(\u5be6\u9a57\u6cd5)<\/p>\n\u3000\u3000\u9069\u7528\uff1a\u6709\u5f48\u7c27\u79e4\u8b80\u6578\uff0c\u5f62\u72c0\u53ef\u4ee5\u4e0d\u898f\u5247\u7684\u5c0f\u7269\u9ad4\u3002<\/p>\n\u3000\u30003\u3001F\u6d6e=G\u6392\u6db2=ρ\u6db2gV\u6392(\u963f\u57fa\u7c73\u5fb7\u539f\u7406\u6cd5)<\/p>\n\u3000\u3000\u9069\u7528\uff1a\u53ef\u4ee5\u77e5\u9053\u6392\u958b\u6db2\u9ad4\u7684\u91cd\u529b\u6216\u9ad4\u7a4d\u3002<\/p>\n\u3000\u30004\u3001F\u6d6e=G\u7269(\u5e73\u8861\u6cd5)<\/p>\n\u3000\u3000\u9069\u7528\uff1a\u6f02\u6d6e\u6216\u61f8\u6d6e<\/p>\n\u3000\u30005\u3001F\u6d6e=m\u6392g(\u6392\u6c34\u91cf\u6cd5)<\/p>\n\u3000\u3000\u9069\u7528\uff1a\u8f2a\u8239\u6216\u5df2\u77e5\u6392\u958b\u6db2\u9ad4\u7684\u8cea\u91cf<\/p>\n\u3000\u3000\u4f8b\u984c\uff1a(1)\u5c07\u9ad4\u7a4d\u76f8\u540c\u7684\u4e09\u500b\u5c0f\u7403A\u3001B\u3001C\u653e\u5165\u6c34\u4e2d\uff0c\u975c\u6b62\u6642\u5728\u6c34\u4e2d\u7684\u4f4d\u7f6e\u5982\u4e0b\u5716\u6240\u793a\uff0c\u4e09\u500b\u7403\u53d7\u5230\u7684\u6d6e\u529b\u5206\u5225\u70baFA\u3001FB\u3001Fc\uff0c\u5247\u9019\u4e09\u500b\u6d6e\u529b\u7684\u5927\u5c0f\u95dc\u7cfb\u662f\uff1f<\/p>\n\u3000\u3000\u89e3\u7b54\uff1a\u5229\u7528\u65b9\u6cd53\uff0c\u6bd4\u8f03V\u6392\u3002<\/p>\n\u3000\u3000∴FC>FB>FA<\/p>\n\u3000\u3000(2)\u5c07\u8cea\u91cf\u76f8\u540c\u7684\u4e09\u500b\u5c0f\u7403A\u3001B\u3001C\u653e\u5165\u6c34\u4e2d\uff0c\u975c\u6b62\u6642\u5728\u6c34\u4e2d\u7684\u4f4d\u7f6e\u5982\u4e0b\u5716\u6240\u793a\uff0c\u4e09\u500b\u7403\u53d7\u5230\u7684\u6d6e\u529b\u5206\u5225\u70baFA\u3001FB\u3001Fc\uff0c\u5247\u9019\u4e09\u500b\u6d6e\u529b\u7684\u5927\u5c0f\u95dc\u7cfb\u662f\uff1f<\/p>\n\u3000\u3000\u89e3\u7b54\uff1a\u5229\u7528\u65b9\u6cd54\u548c\u6d6e\u6c89\u689d\u4ef6\uff0c\u6bd4\u8f03F\u6d6e\u548cG\u7269\u3002\u5c0dA\u548cB\u6f02\u6d6e\uff0cF\u6d6eA=G\u7269\uff0cF\u6d6eB=G\u7269\uff0c\u5c0dC\u6c89\u5e95\uff0cF\u6d6eC<\/p>\n\u3000\u3000∴FC<\/p>\n\u3000\u3000\u5229\u7528\u6c42\u6d6e\u529b\u76845\u7a2e\u65b9\u6cd5\u505a\u4ee5\u4e0b\u5c0d\u6bd4\u7684\u6bd4\u4f8b\u984c\u76ee(\u5df2\u77e5\uff1aρ\u9435=7.9×103kg\/m3\uff0cρ\u92c1=2.7×103kg\/m3\uff0cρ\u6728=0.6×103kg\/m3\uff0cρ\u6c34\u9280=13.6×103kg\/m3\uff0cρ\u51b0=0.9×103kg\/m3\u3002)(\u8a2d\u7b2c\u4e00\u7a2e\u7269\u8cea\u89d2\u6a19\u662f1\uff0c\u7b2c\u4e8c\u7a2e\u7269\u8cea\u89d2\u6a19\u662f2)<\/p>\n\u3000\u3000(\u4e00)1.\u8cea\u91cf\u76f8\u540c\u7684\u9435\u584a\u3001\u92c1\u584a\u653e\u5165\u6c34\u4e2d\u975c\u6b62\u540e\uff0c\u6240\u53d7\u6d6e\u529b\u4e4b\u6bd4\u662f\u591a\u5c11\uff1f<\/p>\n\u3000\u3000\u5206\u6790\uff1a\u9435\u584a\u3001\u92c1\u584a\u653e\u5165\u6c34\u4e2d\u540e\uff0c\u5168\u90e8\u6d78\u6c92\uff0c\u6c42\u6d6e\u529b\u7528\u963f\u57fa\u7c73\u5fb7\u539f\u7406\u3002<\/p>\n\u3000\u3000-=-=-=-=-<\/p>\n\u3000\u30002.\u9ad4\u7a4d\u76f8\u540c\u7684\u9435\u584a\u3001\u92c1\u584a\u653e\u5165\u6c34\u4e2d\u975c\u6b62\u540e\uff0c\u6240\u53d7\u6d6e\u529b\u4e4b\u6bd4\u662f\u591a\u5c11\uff1f<\/p>\n\u3000\u3000-=-=-=-<\/p>\n\u3000\u3000(\u4e8c)1.\u8cea\u91cf\u76f8\u540c\u7684\u9435\u584a\u3001\u6728\u584a\u653e\u5165\u6c34\u4e2d\u975c\u6b62\u540e\uff0c\u6240\u53d7\u6d6e\u529b\u4e4b\u6bd4\u662f\u591a\u5c11\uff1f<\/p>\n\u3000\u3000\u5206\u6790\uff1a\u9435\u584a\u653e\u5165\u6c34\u4e2d\u540e\uff0c\u5168\u90e8\u6d78\u6c92\uff0c\u6c42\u6d6e\u529b\u7528\u963f\u57fa\u7c73\u5fb7\u539f\u7406F\u6d6e=ρ\u6db2gV\u6392\u3002\u6728\u584a\u653e\u5165\u6c34\u4e2d\u540e\uff0c\u6f02\u6d6e\u6c34\u9762\uff0c\u6c42\u6d6e\u529b\u7528\u6d6e\u6c89\u689d\u4ef6F 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{"id":4214,"date":"2010-09-13T20:14:25","date_gmt":"2010-09-14T04:14:25","guid":{"rendered":"http:\/\/tutor.howang.hk\/tag\/?p=4214"},"modified":"2010-09-13T20:14:25","modified_gmt":"2010-09-14T04:14:25","slug":"%e5%90%8d%e5%b8%ab%e7%b8%bd%e7%b5%90%ef%bc%9a%e4%b8%ad%e8%80%83%e7%89%a9%e7%90%86%e6%b5%ae%e5%8a%9b%e6%af%94%e4%be%8b%e8%a6%8f%e5%be%8b","status":"publish","type":"post","link":"https:\/\/www.hktutorcity.com\/tag\/%e5%90%8d%e5%b8%ab%e7%b8%bd%e7%b5%90%ef%bc%9a%e4%b8%ad%e8%80%83%e7%89%a9%e7%90%86%e6%b5%ae%e5%8a%9b%e6%af%94%e4%be%8b%e8%a6%8f%e5%be%8b\/","title":{"rendered":"\u540d\u5e2b\u7e3d\u7d50\uff1a\u4e2d\u8003\u7269\u7406\u6d6e\u529b\u6bd4\u4f8b\u898f\u5f8b"},"content":{"rendered":"

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href=\"http:\/\/tutor.howang.hk\/\">\u88dc\u7fd2\u4ecb\u7d39<\/a><\/b><\/p>\n\u3000\u3000\u6d6e\u529b\u77e5\u8b58\u7d9c\u5408\u6027\u5f37\uff0c\u61c9\u7528\u8d77\u4f86\u65b9\u6cd5\u6bd4\u8f03\u9748\u6d3b\uff0c\u540c\u5b78\u5011\u4e0d\u59a8\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\u3002<\/p>\n\u3000\u3000\u4e00\u3001\u8a08\u7b97\u6d6e\u529b\u7684\u5169\u500b\u91cd\u8981\u7684\u6bd4\u4f8b\u63a8\u8ad6\uff1a<\/p>\n\u3000\u30001\u3001\u7269\u9ad4\u6f02\u6d6e\u6642\uff1aF\u6d6e=G\u7269 <\/p>\n\u3000\u3000ρ\u6db2gV\u6392=ρ\u7269gV\u7269\uff0c-=-<\/p>\n\u3000\u3000\u61c9\u7528\uff1a\u4e00\u6728\u584a\u6f02\u6d6e\u5728\u6c34\u9762\uff0c\u67092\/5\u9ad4\u7a4d\u9732\u51fa\u6c34\u9762\uff0c\u6c42\u6728\u584a\u5bc6\u5ea6\u3002<\/p>\n\u3000\u3000\u2235 -=-=3\/5 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