高一物理
\u9ad8\u4e00\u7269\u7406\u554a\u89e3\uff1a
A:\u56e0\u4e3a\u4e24\u4e2a\u7269\u4f53\u4ece\u540c\u4e00\u9ad8\u5ea6\u6700\u540e\u5230\u8fbe\u540c\u4e00\u6c34\u5e73\u9762\uff0c\u4e24\u4e2a\u7269\u4f53\u6240\u53d7\u91cd\u529b\u76f8\u540c\uff0c\u4e14\u65b9\u5411\u90fd\u662f\u7ad6\u76f4\u5411\u4e0b\uff0c\u6839\u636e\u505a\u529f\u8868\u8fbe\u5f0f\uff1aW=mgS\uff0c\u77e5\u867d\u7136A\u7269\u4f53\u662f\u6cbf\u659c\u9762\u4e0b\u6ed1\uff0c\u4f46\u662f\u4e0eB\u5728\u7ad6\u76f4\u65b9\u5411\u7684\u4f4d\u79fbS\u76f8\u540c\uff0c\u91cd\u529b\u5bf9\u4e24\u7269\u4f53\u505a\u529f\u76f8\u540c\uff0c\u6545A\u5bf9
B\uff1a\u7531A\u5206\u6790\u53ef\u77e5\u4e24\u8005\u505a\u529f\u76f8\u540c\uff0c\u5373WA=WB
\u56e0\u4e3aA\u662f\u6cbf\u659c\u9762\u4e0b\u6ed1\uff0c\u4e0eB\u76f8\u6bd4\uff0c\u8fbe\u5230\u6c34\u5e73\u9762\u7684\u65f6\u95f4\u8981\u957f\u4e00\u4e9b\uff0c\u6839\u636e\u5e73\u5747\u529f\u7387\u8868\u8fbe\u5f0f\uff1aP=w\u2215T\u77e5\uff0c\u4e24\u8005\u65f6\u95f4\u4e0d\u4e00\u6837\uff0cW\u76f8\u540c\uff0c\u6545\u5e73\u5747\u529f\u7387\u4e0d\u540c\uff0c\u6240\u4ee5B\u4e0d\u5bf9
C\uff1a\u7531A\u5206\u6790\u53ef\u77e5\u4e24\u8005\u53d7\u5230\u91cd\u529b\u505a\u7684\u529f\u76f8\u540c\uff0c \u5bf9\u4e8eB\u7269\u4f53\u5230\u8fbe\u6c34\u5e73\u9762\u65f6\u53ea\u6709\u7ad6\u76f4\u65b9\u5411\u7684\u901f\u5ea6\uff0c\u800cA\u7269\u4f53\u5373\u6709\u6c34\u5e73\u65b9\u5411\u7684\u901f\u5ea6\uff0c\u8fd8\u6709\u7ad6\u76f4\u65b9\u5411\u7684\u901f\u5ea6\uff0c\u8fd9\u6837\u7531\u80fd\u91cf\u5b88\u6052\u77e5\uff0c\u8fbe\u5230\u6c34\u5e73\u9762\u65f6A\u7269\u4f53\u5728\u7ad6\u76f4\u65b9\u5411\u7684\u901f\u5ea6\u6bd4B\u7269\u4f53\u8981\u5c0f\uff0c\u6839\u636e\u77ac\u65f6\u529f\u7387\u8868\u8fbe\u5f0f\uff1aP=FV\u77e5\uff0c\u4e24\u8005\u53d7\u529bF\u90fd\u662fG\uff0c\u4f46\u662fA\u7269\u4f53\u5728\u7ad6\u76f4\u65b9\u5411\u7684\u901f\u5ea6\u6bd4B\u7269\u4f53\u8981\u5c0f\uff0c\u6240\u4ee5\u5230\u8fbe\u5e95\u7aef\u65f6\u91cd\u529b\u7684\u77ac\u65f6\u529f\u7387PA\uff1cPB\uff0c\u6545C\u5bf9
D\uff1a\u6839\u636e\u80fd\u91cf\u5b88\u6052\u4e24\u8005\u5230\u8fbe\u5e95\u7aef\u65f6\u53d7\u5230\u91cd\u529b\u505a\u7684\u529f\u76f8\u540c\uff0c\u5219\u4e24\u8005\u7684\u901f\u5ea6\u76f8\u540c\uff0c\u53ea\u662f\u65b9\u5411\u4e0d\u4e00\u6837\u5c31\uff0cB\u7ad6\u76f4\u5411\u4e0b\uff0cA\u6cbf\u659c\u9762\u5411\u4e0b\uff01\u6545D\u4e5f\u5bf9
(1)\u6839\u636e2as=v^2\uff0c\u5f97a=0.05m/s^2
(2)\u6839\u636ea=(f+f\u5236\u52a8)/m\uff0c\u5f97f=6\u00d710^4N
(3)\u6052\u5b9a\u7684\u989d\u5b9a\u529f\u7387\u542f\u52a8\uff0c\u5373F\u989d=F\u7275V\u4e0d\u53d8\uff0c\u6839\u636e\u7531\u4e8e\u901f\u5ea6\u9010\u6e10\u589e\u52a0\uff0c\u6240\u4ee5F\u7275\u9010\u6e10\u51cf\u5c0f\uff0c\u4e00\u76f4\u51cf\u5230F\u7275=f\u65f6\u8fbe\u5230\u6700\u5927\u884c\u9a76\u901f\u5ea6\uff0c\u6545F\u989d=fVmax=1.2\u00d710^6w
(4)\u6839\u636e\u52a8\u80fd\u5b9a\u7406\uff0cF\u989dt-fs1=1/2m(Vmax)^2\uff0c\u5f97s1=10000m\uff0c\u6240\u4ee5S\u603b=s+s1=14km
这两个力夹角为60度是合力为：2*F/(2^1/2)*cos30°=(6^1/2)F/2
所以正确答案是B
B
F1=F2=F/根号2
再求和
F合=F根号6/2
B
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