{"id":448,"date":"2011-02-18T14:36:39","date_gmt":"2011-02-18T06:36:39","guid":{"rendered":"http:\/\/www.hawkwithwind.net\/blog\/?p=448"},"modified":"2011-02-18T14:36:39","modified_gmt":"2011-02-18T06:36:39","slug":"%e8%bd%a6%e7%aa%97%e4%b8%8a%e7%9a%84%e9%9b%a8%e6%bb%b4","status":"publish","type":"post","link":"https:\/\/www.hawkwithwind.net\/blog\/2011\/02\/18\/%e8%bd%a6%e7%aa%97%e4%b8%8a%e7%9a%84%e9%9b%a8%e6%bb%b4\/","title":{"rendered":"\u8f66\u7a97\u4e0a\u7684\u96e8\u6ef4"},"content":{"rendered":"<p>\u6700\u8fd1\u4ee5\u6765\u56f0\u6270\u6211\u7684\u4e00\u4e2a\u7269\u7406\u5c0f\u95ee\u9898\u662f\u5982\u4f55\u901a\u8fc7\u8f66\u7a97\u4e0a\u7684\u96e8\u6ef4\u6ed1\u843d\u7684\u89d2\u5ea6\u6765\u4f30\u8ba1\u8f66\u884c\u901f\u5ea6\u3002\u56e0\u4e3a\u5f88\u4e0d\u5de7\u7684\u662f\u4f3c\u4e4e\u6bcf\u6b21\u6211\u8981\u65c5\u884c\uff0c\u5c31\u4e00\u5b9a\u4f1a\u4e0b\u96e8\u3002\u6240\u4ee5\u6211\u603b\u662f\u76ef\u7740\u8fd9\u4e9b\u659c\u659c\u843d\u4e0b\u7684\u96e8\u6ef4\uff0c\u56f0\u6270\u7740\u3002<\/p>\n<p>\u6211\u6700\u521d\u7684\u60f3\u6cd5\u5f88\u7b80\u5355\u3002\u5c31\u662f\u8003\u8651\u53d7\u529b\u60c5\u51b5\u3002\u6c34\u6ef4\u53d7\u5230\u7684\u91cd\u529b\u548c\u8fce\u98ce\u529b\u7684\u5408\u529b\uff0c\u4e00\u5b9a\u662f\u6cbf\u7740\u6c34\u6ef4\u6ed1\u843d\u7684\u65b9\u5411\u3002\u5f53\u7136\u8981\u8003\u8651\u8f66\u7a97\u7684\u6469\u64e6\u529b\uff0c\u4f46\u662f\u7531\u4e8e\u90a3\u4e2a\u529b\u4e00\u5b9a\u8ddf\u5408\u529b\u7684\u65b9\u5411\u76f8\u53cd\uff0c\u6240\u4ee5\u4e0d\u4f1a\u5f71\u54cd\u5939\u89d2\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5f53\u6c34\u6ef4\u6cbf\u774045\u5ea6\u6ed1\u843d\u7684\u65f6\u5019\uff0c\u8fce\u98ce\u529b\u521a\u597d\u7b49\u4e8e\u91cd\u529b\u3002\u63a5\u7740\u8003\u8651\u52a8\u91cf\u548c\u51b2\u91cf\u5173\u7cfb\u3002\u5047\u8bbe\u7a7a\u6c14\u5728\u65f6\u95f4t\u5185\u649e\u51fb\u6c34\u6ef4\u7684\u52a8\u91cfmv\u5168\u90fd\u8f6c\u5316\u4e3a\u63a8\u52a8\u6c34\u6ef4\u7684\u51b2\u91cfFt\u3002\u5176\u5b9e\u4e0d\u7136\uff0c\u56e0\u4e3a\u7a7a\u6c14\u63a8\u52a8\u6c34\u6ef4\u540e\u4f1a\u968f\u6c34\u6ef4\u4e00\u540c\u79fb\u52a8\uff0c\u800c\u975e\u8017\u5c3d\u5168\u90e8\u52a8\u91cf\u3002\u4f46\u662f\u7531\u4e8e\u6c34\u6ef4\u5728\u73bb\u7483\u4e0a\u7684\u6ed1\u52a8\u901f\u5ea6\u975e\u5e38\u6162\uff0c\u800c\u7a7a\u6c14\u7684\u63a8\u52a8\u901f\u5ea6\u5f88\u5feb\uff08\u8fd9\u91cc\u662f\u4ee5\u8f66\u4e3a\u53c2\u8003\u7cfb\u6240\u4ee5\u7a7a\u6c14\u901f\u5ea6\u5c31\u662f\u8f66\u901f\uff09\uff0c\u6211\u60f3\u5373\u4f7f\u5ffd\u7565\u4e4b\u4e5f\u4e0d\u4f1a\u6709\u592a\u5927\u7684\u8bef\u5dee\u3002\u7136\u540e\u6211\u518d\u8fd1\u4f3c\u8ba4\u4e3a\u6c34\u6ef4\u662f\u957fa\u5bbdb\u9ad8c\u7684\u957f\u65b9\u4f53\u3002\u5176\u8fce\u98ce\u9762\u79ef\u4e3ab\u00b7c\u3002\u5219\u65b9\u7a0b\u5982\u4e0b\uff0c\u53d1\u73b0t\u6b63\u597d\u53ef\u4ee5\u6d88\u53bb\u3002<\/p>\n<pre>    Ma = Va\u00b7\u03c1a\u00b7t\u00b7b\u00b7c\r\n    Ma\u00b7Va = F\u00b7t\r\n    =&gt;\r\n    Va<sup>2<\/sup>\u00b7\u03c1a\u00b7b\u00b7c = F<\/pre>\n<p>\u6211\u4eec\u53c8\u5047\u8bbeF\u662f\u6c34\u53d7\u5230\u7684\u91cd\u529b<\/p>\n<pre>    F = Mw\u00b7g = a\u00b7b\u00b7c\u00b7\u03c1w\u00b7g\r\n    a\u00b7b\u00b7c\u00b7\u03c1w\u00b7g = Va<sup>2<\/sup>\u00b7\u03c1a\u00b7b\u00b7c\r\n    Va<sup>2<\/sup> = a\u00b7\u03c1w\u00b7g \/ \u03c1a<\/pre>\n<p>\u5176\u4e2d\u9664\u4e86\u6c34\u6ef4\u7684\u957f\u5ea6a\u53ea\u80fd\u731c\u6d4b\u5916\uff0c\u5176\u4ed6\u90fd\u662f\u5e38\u91cf\u3002\u6c34\u7684\u5bc6\u5ea6\u5dee\u4e0d\u591a\u662f\u7a7a\u6c14\u76841000\u500d\u3002g\u4f30\u7b97\u4e3a10\u3002\u6c34\u6ef4\u7684\u957f\u5ea6\u4f30\u8ba1\u4e3a0.5cm\u4e5f\u5c31\u662f0.005m\u3002\u5219\u8fd9\u4e2aVa\u5dee\u4e0d\u591a\u662f25km\/h\u3002<\/p>\n<p>\u8fd9\u4e2a\u6570\u503c\u8fd9\u4e48\u4f4e\uff0c\u662f\u56e0\u4e3a\u6211\u53d6\u7684\u89d2\u5ea6\u662f45\u5ea6\u3002\u5b9e\u9645\u884c\u9a76\u7684\u65f6\u5019\uff0c\u96e8\u6ef4\u51e0\u4e4e\u662f\u6a2a\u7740\u5212\u8fc7\u73bb\u7483\u3002\u53ef\u60dc\u6211\u6ca1\u6709\u6d4b\u91cf\u4ed6\u7684tan\u503c\u3002\u4e0b\u6b21\u65c5\u884c\u5047\u5982\u6211\u53c8\u9047\u5230\u4e0b\u96e8\u5c31\u53ef\u4ee5\u901a\u8fc7\u5b9e\u9645\u6d4b\u91cf\u68c0\u9a8c\u6211\u7684\u7406\u8bba\u662f\u5426\u6b63\u786e\u5566\uff5e<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6700\u8fd1\u4ee5\u6765\u56f0\u6270\u6211\u7684\u4e00\u4e2a\u7269\u7406\u5c0f\u95ee\u9898\u662f\u5982\u4f55\u901a\u8fc7\u8f66\u7a97\u4e0a\u7684\u96e8\u6ef4\u6ed1\u843d\u7684\u89d2\u5ea6\u6765\u4f30\u8ba1\u8f66\u884c\u901f\u5ea6\u3002\u56e0\u4e3a\u5f88\u4e0d\u5de7\u7684\u662f\u4f3c\u4e4e\u6bcf\u6b21\u6211\u8981\u65c5\u884c\uff0c\u5c31\u4e00\u5b9a\u4f1a\u4e0b\u96e8\u3002\u6240\u4ee5\u6211\u603b\u662f\u76ef\u7740\u8fd9\u4e9b\u659c\u659c\u843d\u4e0b\u7684\u96e8\u6ef4\uff0c\u56f0\u6270\u7740\u3002 \u6211\u6700\u521d\u7684\u60f3\u6cd5\u5f88\u7b80\u5355\u3002\u5c31\u662f\u8003\u8651\u53d7\u529b\u60c5\u51b5\u3002\u6c34\u6ef4\u53d7\u5230\u7684\u91cd\u529b\u548c\u8fce\u98ce\u529b\u7684\u5408\u529b\uff0c\u4e00\u5b9a\u662f\u6cbf\u7740\u6c34\u6ef4\u6ed1\u843d\u7684\u65b9\u5411\u3002\u5f53\u7136\u8981\u8003\u8651\u8f66\u7a97\u7684\u6469\u64e6\u529b\uff0c\u4f46\u662f\u7531\u4e8e\u90a3\u4e2a\u529b\u4e00\u5b9a\u8ddf\u5408\u529b\u7684\u65b9\u5411\u76f8\u53cd\uff0c\u6240\u4ee5\u4e0d\u4f1a\u5f71\u54cd\u5939\u89d2\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5f53\u6c34\u6ef4\u6cbf\u774045\u5ea6\u6ed1\u843d\u7684\u65f6\u5019\uff0c\u8fce\u98ce\u529b\u521a\u597d\u7b49\u4e8e\u91cd\u529b\u3002\u63a5\u7740\u8003\u8651\u52a8\u91cf\u548c\u51b2\u91cf\u5173\u7cfb\u3002\u5047\u8bbe\u7a7a\u6c14\u5728\u65f6\u95f4t\u5185\u649e\u51fb\u6c34\u6ef4\u7684\u52a8\u91cfmv\u5168\u90fd\u8f6c\u5316\u4e3a\u63a8\u52a8\u6c34\u6ef4\u7684\u51b2\u91cfFt\u3002\u5176\u5b9e\u4e0d\u7136\uff0c\u56e0\u4e3a\u7a7a\u6c14\u63a8\u52a8\u6c34\u6ef4\u540e\u4f1a\u968f\u6c34\u6ef4\u4e00\u540c\u79fb\u52a8\uff0c\u800c\u975e\u8017\u5c3d\u5168\u90e8\u52a8\u91cf\u3002\u4f46\u662f\u7531\u4e8e\u6c34\u6ef4\u5728\u73bb\u7483\u4e0a\u7684\u6ed1\u52a8\u901f\u5ea6\u975e\u5e38\u6162\uff0c\u800c\u7a7a\u6c14\u7684\u63a8\u52a8\u901f\u5ea6\u5f88\u5feb\uff08\u8fd9\u91cc\u662f\u4ee5\u8f66\u4e3a\u53c2\u8003\u7cfb\u6240\u4ee5\u7a7a\u6c14\u901f\u5ea6\u5c31\u662f\u8f66\u901f\uff09\uff0c\u6211\u60f3\u5373\u4f7f\u5ffd\u7565\u4e4b\u4e5f\u4e0d\u4f1a\u6709\u592a\u5927\u7684\u8bef\u5dee\u3002\u7136\u540e\u6211\u518d\u8fd1\u4f3c\u8ba4\u4e3a\u6c34\u6ef4\u662f\u957fa\u5bbdb\u9ad8c\u7684\u957f\u65b9\u4f53\u3002\u5176\u8fce\u98ce\u9762\u79ef\u4e3ab\u00b7c\u3002\u5219\u65b9\u7a0b\u5982\u4e0b\uff0c\u53d1\u73b0t\u6b63\u597d\u53ef\u4ee5\u6d88\u53bb\u3002 Ma = Va\u00b7\u03c1a\u00b7t\u00b7b\u00b7c Ma\u00b7Va = F\u00b7t =&gt; Va2\u00b7\u03c1a\u00b7b\u00b7c = F \u6211\u4eec\u53c8\u5047\u8bbeF\u662f\u6c34\u53d7\u5230\u7684\u91cd\u529b F = Mw\u00b7g = a\u00b7b\u00b7c\u00b7\u03c1w\u00b7g a\u00b7b\u00b7c\u00b7\u03c1w\u00b7g = Va2\u00b7\u03c1a\u00b7b\u00b7c Va2 = a\u00b7\u03c1w\u00b7g \/ \u03c1a \u5176\u4e2d\u9664\u4e86\u6c34\u6ef4\u7684\u957f\u5ea6a\u53ea\u80fd\u731c\u6d4b\u5916\uff0c\u5176\u4ed6\u90fd\u662f\u5e38\u91cf\u3002\u6c34\u7684\u5bc6\u5ea6\u5dee\u4e0d\u591a\u662f\u7a7a\u6c14\u76841000\u500d\u3002g\u4f30\u7b97\u4e3a10\u3002\u6c34\u6ef4\u7684\u957f\u5ea6\u4f30\u8ba1\u4e3a0.5cm\u4e5f\u5c31\u662f0.005m\u3002\u5219\u8fd9\u4e2aVa\u5dee\u4e0d\u591a\u662f25km\/h\u3002 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