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\u5411\u5185\u7684\u529b\u53ef\u4ee5\u7406\u89e3\u6a61\u76ae\u7684\u5f20\u529b\uff0c\u5355\u4f4d\u957f\u5ea6\u63d0\u4f9b\u7684\u529b\u4e3aK,\u90a3\u4e48\u4e00\u4e2a\u5468\u957f\u6240\u4ea7\u751f\u7684\u529b\u4e3a\n$$ F= K 2 \\pi R$$  \n4\u538b\u5f3a\u5b9e\u9645\u5c31\u662f\u529b\u5728\u9762\u79ef\u4e0a\u7684\u5e73\u5747\u503c\uff0c\u53cd\u8fc7\u6765\uff0c\u5185\u90e8\u7684\u538b\u5f3a\u6210\u9762\u79ef\u5c31\u662f\u529b\u3002\n\u628a\u7403\u60f3\u8c61\u6210\u4e24\u534a\u7403\u9762\u53e0\u52a0\uff0c\u538b\u5f3ax\u9762\u7684\u529b\u8981\u5206\u5f00\u4ed6\u4eec\u3002\n$$ F= PS=P \\pi R^2$$  \n\n\u8054\u7acb \n\n$$ P= 2K \\over R $$ 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