高中物理!!!
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1\uff09\u5300\u53d8\u901f\u76f4\u7ebf\u8fd0\u52a8
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3.\u4e2d\u95f4\u65f6\u523b\u901f\u5ea6Vt/2\uff1dV\u5e73\uff1d(Vt+Vo)/2 4.\u672b\u901f\u5ea6Vt\uff1dVo+at
5.\u4e2d\u95f4\u4f4d\u7f6e\u901f\u5ea6Vs/2\uff1d[(Vo2+Vt2)/2]1/2 6.\u4f4d\u79fbs\uff1dV\u5e73t\uff1dVot+at2/2\uff1dVt/2t
7.\u52a0\u901f\u5ea6a\uff1d(Vt-Vo)/t \uff5b\u4ee5Vo\u4e3a\u6b63\u65b9\u5411\uff0ca\u4e0eVo\u540c\u5411(\u52a0\u901f)a>0\uff1b\u53cd\u5411\u5219a<0\uff5d
8.\u5b9e\u9a8c\u7528\u63a8\u8bba\u0394s\uff1daT2 \uff5b\u0394s\u4e3a\u8fde\u7eed\u76f8\u90bb\u76f8\u7b49\u65f6\u95f4(T)\u5185\u4f4d\u79fb\u4e4b\u5dee\uff5d
9.\u4e3b\u8981\u7269\u7406\u91cf\u53ca\u5355\u4f4d:\u521d\u901f\u5ea6(Vo):m/s\uff1b\u52a0\u901f\u5ea6(a):m/s2\uff1b\u672b\u901f\u5ea6(Vt):m/s\uff1b\u65f6\u95f4(t)\u79d2(s)\uff1b\u4f4d\u79fb(s):\u7c73\uff08m\uff09\uff1b\u8def\u7a0b:\u7c73\uff1b\u901f\u5ea6\u5355\u4f4d\u6362\u7b97\uff1a1m/s=3.6km/h\u3002
\u6ce8\uff1a
(1)\u5e73\u5747\u901f\u5ea6\u662f\u77e2\u91cf;
(2)\u7269\u4f53\u901f\u5ea6\u5927,\u52a0\u901f\u5ea6\u4e0d\u4e00\u5b9a\u5927;
(3)a=(Vt-Vo)/t\u53ea\u662f\u91cf\u5ea6\u5f0f\uff0c\u4e0d\u662f\u51b3\u5b9a\u5f0f;
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2)\u81ea\u7531\u843d\u4f53\u8fd0\u52a8
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\u6ce8:
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(2)a\uff1dg\uff1d9.8m/s2\u224810m/s2\uff08\u91cd\u529b\u52a0\u901f\u5ea6\u5728\u8d64\u9053\u9644\u8fd1\u8f83\u5c0f,\u5728\u9ad8\u5c71\u5904\u6bd4\u5e73\u5730\u5c0f\uff0c\u65b9\u5411\u7ad6\u76f4\u5411\u4e0b\uff09\u3002
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3.\u6709\u7528\u63a8\u8bbaVt2-Vo2\uff1d-2gs 4.\u4e0a\u5347\u6700\u5927\u9ad8\u5ea6Hm\uff1dVo2/2g(\u629b\u51fa\u70b9\u7b97\u8d77\uff09
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\u6ce8:
(1)\u5168\u8fc7\u7a0b\u5904\u7406:\u662f\u5300\u51cf\u901f\u76f4\u7ebf\u8fd0\u52a8\uff0c\u4ee5\u5411\u4e0a\u4e3a\u6b63\u65b9\u5411\uff0c\u52a0\u901f\u5ea6\u53d6\u8d1f\u503c\uff1b
(2)\u5206\u6bb5\u5904\u7406\uff1a\u5411\u4e0a\u4e3a\u5300\u51cf\u901f\u76f4\u7ebf\u8fd0\u52a8\uff0c\u5411\u4e0b\u4e3a\u81ea\u7531\u843d\u4f53\u8fd0\u52a8\uff0c\u5177\u6709\u5bf9\u79f0\u6027\uff1b
(3)\u4e0a\u5347\u4e0e\u4e0b\u843d\u8fc7\u7a0b\u5177\u6709\u5bf9\u79f0\u6027,\u5982\u5728\u540c\u70b9\u901f\u5ea6\u7b49\u503c\u53cd\u5411\u7b49\u3002
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3.\u6c34\u5e73\u65b9\u5411\u4f4d\u79fb\uff1ax\uff1dVot 4.\u7ad6\u76f4\u65b9\u5411\u4f4d\u79fb\uff1ay\uff1dgt2/2
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6.\u5408\u901f\u5ea6Vt\uff1d(Vx2+Vy2)1/2\uff1d[Vo2+(gt)2]1/2
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2\uff09\u5300\u901f\u5706\u5468\u8fd0\u52a8
1.\u7ebf\u901f\u5ea6V\uff1ds/t\uff1d2\u03c0r/T 2.\u89d2\u901f\u5ea6\u03c9\uff1d\u03a6/t\uff1d2\u03c0/T\uff1d2\u03c0f
3.\u5411\u5fc3\u52a0\u901f\u5ea6a\uff1dV2/r\uff1d\u03c92r\uff1d(2\u03c0/T)2r 4.\u5411\u5fc3\u529bF\u5fc3\uff1dmV2/r\uff1dm\u03c92r\uff1dmr(2\u03c0/T)2\uff1dm\u03c9v=F\u5408
5.\u5468\u671f\u4e0e\u9891\u7387\uff1aT\uff1d1/f 6.\u89d2\u901f\u5ea6\u4e0e\u7ebf\u901f\u5ea6\u7684\u5173\u7cfb\uff1aV\uff1d\u03c9r
7.\u89d2\u901f\u5ea6\u4e0e\u8f6c\u901f\u7684\u5173\u7cfb\u03c9\uff1d2\u03c0n(\u6b64\u5904\u9891\u7387\u4e0e\u8f6c\u901f\u610f\u4e49\u76f8\u540c)
8.\u4e3b\u8981\u7269\u7406\u91cf\u53ca\u5355\u4f4d\uff1a\u5f27\u957f(s):\u7c73(m)\uff1b\u89d2\u5ea6(\u03a6)\uff1a\u5f27\u5ea6\uff08rad\uff09\uff1b\u9891\u7387\uff08f\uff09\uff1a\u8d6b\uff08Hz\uff09\uff1b\u5468\u671f\uff08T\uff09\uff1a\u79d2\uff08s\uff09\uff1b\u8f6c\u901f\uff08n\uff09\uff1ar/s\uff1b\u534a\u5f84®:\u7c73\uff08m\uff09\uff1b\u7ebf\u901f\u5ea6\uff08V\uff09\uff1am/s\uff1b\u89d2\u901f\u5ea6\uff08\u03c9\uff09\uff1arad/s\uff1b\u5411\u5fc3\u52a0\u901f\u5ea6\uff1am/s2\u3002
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3)\u4e07\u6709\u5f15\u529b
1.\u5f00\u666e\u52d2\u7b2c\u4e09\u5b9a\u5f8b\uff1aT2/R3\uff1dK(\uff1d4\u03c02/GM)\uff5bR:\u8f68\u9053\u534a\u5f84\uff0cT:\u5468\u671f\uff0cK:\u5e38\u91cf(\u4e0e\u884c\u661f\u8d28\u91cf\u65e0\u5173\uff0c\u53d6\u51b3\u4e8e\u4e2d\u5fc3\u5929\u4f53\u7684\u8d28\u91cf)\uff5d
2.\u4e07\u6709\u5f15\u529b\u5b9a\u5f8b\uff1aF\uff1dGm1m2/r2 \uff08G\uff1d6.67\u00d710-11N•m2/kg2\uff0c\u65b9\u5411\u5728\u5b83\u4eec\u7684\u8fde\u7ebf\u4e0a\uff09
3.\u5929\u4f53\u4e0a\u7684\u91cd\u529b\u548c\u91cd\u529b\u52a0\u901f\u5ea6\uff1aGMm/R2\uff1dmg\uff1bg\uff1dGM/R2 \uff5bR:\u5929\u4f53\u534a\u5f84(m)\uff0cM\uff1a\u5929\u4f53\u8d28\u91cf\uff08kg\uff09\uff5d
4.\u536b\u661f\u7ed5\u884c\u901f\u5ea6\u3001\u89d2\u901f\u5ea6\u3001\u5468\u671f\uff1aV\uff1d(GM/r)1/2\uff1b\u03c9\uff1d(GM/r3)1/2\uff1bT\uff1d2\u03c0(r3/GM)1/2\uff5bM\uff1a\u4e2d\u5fc3\u5929\u4f53\u8d28\u91cf\uff5d
5.\u7b2c\u4e00(\u4e8c\u3001\u4e09)\u5b87\u5b99\u901f\u5ea6V1\uff1d(g\u5730r\u5730)1/2\uff1d(GM/r\u5730)1/2\uff1d7.9km/s\uff1bV2\uff1d11.2km/s\uff1bV3\uff1d16.7km/s
6.\u5730\u7403\u540c\u6b65\u536b\u661fGMm/(r\u5730+h)2\uff1dm4\u03c02(r\u5730+h)/T2\uff5bh\u224836000km\uff0ch:\u8ddd\u5730\u7403\u8868\u9762\u7684\u9ad8\u5ea6\uff0cr\u5730:\u5730\u7403\u7684\u534a\u5f84\uff5d
\u6ce8:
(1)\u5929\u4f53\u8fd0\u52a8\u6240\u9700\u7684\u5411\u5fc3\u529b\u7531\u4e07\u6709\u5f15\u529b\u63d0\u4f9b,F\u5411\uff1dF\u4e07\uff1b
(2)\u5e94\u7528\u4e07\u6709\u5f15\u529b\u5b9a\u5f8b\u53ef\u4f30\u7b97\u5929\u4f53\u7684\u8d28\u91cf\u5bc6\u5ea6\u7b49\uff1b
(3)\u5730\u7403\u540c\u6b65\u536b\u661f\u53ea\u80fd\u8fd0\u884c\u4e8e\u8d64\u9053\u4e0a\u7a7a\uff0c\u8fd0\u884c\u5468\u671f\u548c\u5730\u7403\u81ea\u8f6c\u5468\u671f\u76f8\u540c\uff1b
(4)\u536b\u661f\u8f68\u9053\u534a\u5f84\u53d8\u5c0f\u65f6,\u52bf\u80fd\u53d8\u5c0f\u3001\u52a8\u80fd\u53d8\u5927\u3001\u901f\u5ea6\u53d8\u5927\u3001\u5468\u671f\u53d8\u5c0f\uff08\u4e00\u540c\u4e09\u53cd\uff09\uff1b
(5)\u5730\u7403\u536b\u661f\u7684\u6700\u5927\u73af\u7ed5\u901f\u5ea6\u548c\u6700\u5c0f\u53d1\u5c04\u901f\u5ea6\u5747\u4e3a7.9km/s\u3002
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1\uff09\u5e38\u89c1\u7684\u529b
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2.\u80e1\u514b\u5b9a\u5f8bF\uff1dkx \uff5b\u65b9\u5411\u6cbf\u6062\u590d\u5f62\u53d8\u65b9\u5411\uff0ck\uff1a\u52b2\u5ea6\u7cfb\u6570(N/m)\uff0cx\uff1a\u5f62\u53d8\u91cf(m)\uff5d
3.\u6ed1\u52a8\u6469\u64e6\u529bF\uff1d\u03bcFN \uff5b\u4e0e\u7269\u4f53\u76f8\u5bf9\u8fd0\u52a8\u65b9\u5411\u76f8\u53cd\uff0c\u03bc\uff1a\u6469\u64e6\u56e0\u6570\uff0cFN\uff1a\u6b63\u538b\u529b(N)\uff5d
4.\u9759\u6469\u64e6\u529b0\u2264f\u9759\u2264fm \uff08\u4e0e\u7269\u4f53\u76f8\u5bf9\u8fd0\u52a8\u8d8b\u52bf\u65b9\u5411\u76f8\u53cd\uff0cfm\u4e3a\u6700\u5927\u9759\u6469\u64e6\u529b\uff09
5.\u4e07\u6709\u5f15\u529bF\uff1dGm1m2/r2 \uff08G\uff1d6.67\u00d710-11N•m2/kg2,\u65b9\u5411\u5728\u5b83\u4eec\u7684\u8fde\u7ebf\u4e0a\uff09
6.\u9759\u7535\u529bF\uff1dkQ1Q2/r2 \uff08k\uff1d9.0\u00d7109N•m2/C2,\u65b9\u5411\u5728\u5b83\u4eec\u7684\u8fde\u7ebf\u4e0a\uff09
7.\u7535\u573a\u529bF\uff1dEq \uff08E\uff1a\u573a\u5f3aN/C\uff0cq\uff1a\u7535\u91cfC\uff0c\u6b63\u7535\u8377\u53d7\u7684\u7535\u573a\u529b\u4e0e\u573a\u5f3a\u65b9\u5411\u76f8\u540c\uff09
8.\u5b89\u57f9\u529bF\uff1dBILsin\u03b8 \uff08\u03b8\u4e3aB\u4e0eL\u7684\u5939\u89d2\uff0c\u5f53L\u22a5B\u65f6:F\uff1dBIL\uff0cB//L\u65f6:F\uff1d0\uff09
9.\u6d1b\u4ed1\u5179\u529bf\uff1dqVBsin\u03b8 \uff08\u03b8\u4e3aB\u4e0eV\u7684\u5939\u89d2\uff0c\u5f53V\u22a5B\u65f6\uff1af\uff1dqVB\uff0cV//B\u65f6:f\uff1d0\uff09
\u6ce8:
(1)\u52b2\u5ea6\u7cfb\u6570k\u7531\u5f39\u7c27\u81ea\u8eab\u51b3\u5b9a;
(2)\u6469\u64e6\u56e0\u6570\u03bc\u4e0e\u538b\u529b\u5927\u5c0f\u53ca\u63a5\u89e6\u9762\u79ef\u5927\u5c0f\u65e0\u5173\uff0c\u7531\u63a5\u89e6\u9762\u6750\u6599\u7279\u6027\u4e0e\u8868\u9762\u72b6\u51b5\u7b49\u51b3\u5b9a;
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2\uff09\u529b\u7684\u5408\u6210\u4e0e\u5206\u89e3
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4.\u529b\u7684\u6b63\u4ea4\u5206\u89e3\uff1aFx\uff1dFcos\u03b2\uff0cFy\uff1dFsin\u03b2\uff08\u03b2\u4e3a\u5408\u529b\u4e0ex\u8f74\u4e4b\u95f4\u7684\u5939\u89d2tg\u03b2\uff1dFy/Fx\uff09
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(1)\u529b(\u77e2\u91cf)\u7684\u5408\u6210\u4e0e\u5206\u89e3\u9075\u5faa\u5e73\u884c\u56db\u8fb9\u5f62\u5b9a\u5219;
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(3)\u9664\u516c\u5f0f\u6cd5\u5916\uff0c\u4e5f\u53ef\u7528\u4f5c\u56fe\u6cd5\u6c42\u89e3,\u6b64\u65f6\u8981\u9009\u62e9\u6807\u5ea6,\u4e25\u683c\u4f5c\u56fe;
(4)F1\u4e0eF2\u7684\u503c\u4e00\u5b9a\u65f6,F1\u4e0eF2\u7684\u5939\u89d2(\u03b1\u89d2)\u8d8a\u5927\uff0c\u5408\u529b\u8d8a\u5c0f;
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1.\u725b\u987f\u7b2c\u4e00\u8fd0\u52a8\u5b9a\u5f8b(\u60ef\u6027\u5b9a\u5f8b\uff09\uff1a\u7269\u4f53\u5177\u6709\u60ef\u6027\uff0c\u603b\u4fdd\u6301\u5300\u901f\u76f4\u7ebf\u8fd0\u52a8\u72b6\u6001\u6216\u9759\u6b62\u72b6\u6001,\u76f4\u5230\u6709\u5916\u529b\u8feb\u4f7f\u5b83\u6539\u53d8\u8fd9\u79cd\u72b6\u6001\u4e3a\u6b62
2.\u725b\u987f\u7b2c\u4e8c\u8fd0\u52a8\u5b9a\u5f8b\uff1aF\u5408\uff1dma\u6216a\uff1dF\u5408/ma{\u7531\u5408\u5916\u529b\u51b3\u5b9a,\u4e0e\u5408\u5916\u529b\u65b9\u5411\u4e00\u81f4}
3.\u725b\u987f\u7b2c\u4e09\u8fd0\u52a8\u5b9a\u5f8b\uff1aF\uff1d-F´{\u8d1f\u53f7\u8868\u793a\u65b9\u5411\u76f8\u53cd,F\u3001F´\u5404\u81ea\u4f5c\u7528\u5728\u5bf9\u65b9\uff0c\u5e73\u8861\u529b\u4e0e\u4f5c\u7528\u529b\u53cd\u4f5c\u7528\u529b\u533a\u522b\uff0c\u5b9e\u9645\u5e94\u7528\uff1a\u53cd\u51b2\u8fd0\u52a8}
4.\u5171\u70b9\u529b\u7684\u5e73\u8861F\u5408\uff1d0\uff0c\u63a8\u5e7f \uff5b\u6b63\u4ea4\u5206\u89e3\u6cd5\u3001\u4e09\u529b\u6c47\u4ea4\u539f\u7406\uff5d
5.\u8d85\u91cd\uff1aFN>G\uff0c\u5931\u91cd\uff1aFN<G {\u52a0\u901f\u5ea6\u65b9\u5411\u5411\u4e0b\uff0c\u5747\u5931\u91cd\uff0c\u52a0\u901f\u5ea6\u65b9\u5411\u5411\u4e0a\uff0c\u5747\u8d85\u91cd}
6.\u725b\u987f\u8fd0\u52a8\u5b9a\u5f8b\u7684\u9002\u7528\u6761\u4ef6\uff1a\u9002\u7528\u4e8e\u89e3\u51b3\u4f4e\u901f\u8fd0\u52a8\u95ee\u9898\uff0c\u9002\u7528\u4e8e\u5b8f\u89c2\u7269\u4f53\uff0c\u4e0d\u9002\u7528\u4e8e\u5904\u7406\u9ad8\u901f\u95ee\u9898\uff0c\u4e0d\u9002\u7528\u4e8e\u5fae\u89c2\u7c92\u5b50\u3014\u89c1\u7b2c\u4e00\u518cP67\u3015
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1.\u7b80\u8c10\u632f\u52a8F\uff1d-kx {F:\u56de\u590d\u529b\uff0ck:\u6bd4\u4f8b\u7cfb\u6570\uff0cx:\u4f4d\u79fb\uff0c\u8d1f\u53f7\u8868\u793aF\u7684\u65b9\u5411\u4e0ex\u59cb\u7ec8\u53cd\u5411}
2.\u5355\u6446\u5468\u671fT\uff1d2\u03c0(l/g)1/2 \uff5bl:\u6446\u957f(m)\uff0cg:\u5f53\u5730\u91cd\u529b\u52a0\u901f\u5ea6\u503c\uff0c\u6210\u7acb\u6761\u4ef6:\u6446\u89d2\u03b8>r\uff5d
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5.\u673a\u68b0\u6ce2\u3001\u6a2a\u6ce2\u3001\u7eb5\u6ce2\u3014\u89c1\u7b2c\u4e8c\u518cP2\u3015
6.\u6ce2\u901fv\uff1ds/t\uff1d\u03bbf\uff1d\u03bb/T{\u6ce2\u4f20\u64ad\u8fc7\u7a0b\u4e2d\uff0c\u4e00\u4e2a\u5468\u671f\u5411\u524d\u4f20\u64ad\u4e00\u4e2a\u6ce2\u957f\uff1b\u6ce2\u901f\u5927\u5c0f\u7531\u4ecb\u8d28\u672c\u8eab\u6240\u51b3\u5b9a}
7.\u58f0\u6ce2\u7684\u6ce2\u901f(\u5728\u7a7a\u6c14\u4e2d\uff090\u2103\uff1a332m/s\uff1b20\u2103:344m/s\uff1b30\u2103:349m/s\uff1b(\u58f0\u6ce2\u662f\u7eb5\u6ce2)
8.\u6ce2\u53d1\u751f\u660e\u663e\u884d\u5c04\uff08\u6ce2\u7ed5\u8fc7\u969c\u788d\u7269\u6216\u5b54\u7ee7\u7eed\u4f20\u64ad\uff09\u6761\u4ef6\uff1a\u969c\u788d\u7269\u6216\u5b54\u7684\u5c3a\u5bf8\u6bd4\u6ce2\u957f\u5c0f\uff0c\u6216\u8005\u76f8\u5dee\u4e0d\u5927
9.\u6ce2\u7684\u5e72\u6d89\u6761\u4ef6\uff1a\u4e24\u5217\u6ce2\u9891\u7387\u76f8\u540c(\u76f8\u5dee\u6052\u5b9a\u3001\u632f\u5e45\u76f8\u8fd1\u3001\u632f\u52a8\u65b9\u5411\u76f8\u540c)
10.\u591a\u666e\u52d2\u6548\u5e94:\u7531\u4e8e\u6ce2\u6e90\u4e0e\u89c2\u6d4b\u8005\u95f4\u7684\u76f8\u4e92\u8fd0\u52a8\uff0c\u5bfc\u81f4\u6ce2\u6e90\u53d1\u5c04\u9891\u7387\u4e0e\u63a5\u6536\u9891\u7387\u4e0d\u540c\uff5b\u76f8\u4e92\u63a5\u8fd1\uff0c\u63a5\u6536\u9891\u7387\u589e\u5927\uff0c\u53cd\u4e4b\uff0c\u51cf\u5c0f\u3014\u89c1\u7b2c\u4e8c\u518cP21\u3015\uff5d
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1.\u52a8\u91cf\uff1ap\uff1dmv \uff5bp:\u52a8\u91cf(kg/s)\uff0cm:\u8d28\u91cf(kg)\uff0cv:\u901f\u5ea6(m/s)\uff0c\u65b9\u5411\u4e0e\u901f\u5ea6\u65b9\u5411\u76f8\u540c\uff5d
3.\u51b2\u91cf\uff1aI\uff1dFt \uff5bI:\u51b2\u91cf(N•s)\uff0cF:\u6052\u529b(N)\uff0ct:\u529b\u7684\u4f5c\u7528\u65f6\u95f4(s)\uff0c\u65b9\u5411\u7531F\u51b3\u5b9a\uff5d
4.\u52a8\u91cf\u5b9a\u7406\uff1aI\uff1d\u0394p\u6216Ft\uff1dmvt\u2013mvo {\u0394p:\u52a8\u91cf\u53d8\u5316\u0394p\uff1dmvt\u2013mvo\uff0c\u662f\u77e2\u91cf\u5f0f}
5.\u52a8\u91cf\u5b88\u6052\u5b9a\u5f8b\uff1ap\u524d\u603b\uff1dp\u540e\u603b\u6216p\uff1dp\u2019´\u4e5f\u53ef\u4ee5\u662fm1v1+m2v2\uff1dm1v1´+m2v2´
6.\u5f39\u6027\u78b0\u649e\uff1a\u0394p\uff1d0\uff1b\u0394Ek\uff1d0 {\u5373\u7cfb\u7edf\u7684\u52a8\u91cf\u548c\u52a8\u80fd\u5747\u5b88\u6052}
7.\u975e\u5f39\u6027\u78b0\u649e\u0394p\uff1d0\uff1b0<\u0394EK<\u0394EKm {\u0394EK\uff1a\u635f\u5931\u7684\u52a8\u80fd\uff0cEKm\uff1a\u635f\u5931\u7684\u6700\u5927\u52a8\u80fd}
8.\u5b8c\u5168\u975e\u5f39\u6027\u78b0\u649e\u0394p\uff1d0\uff1b\u0394EK\uff1d\u0394EKm {\u78b0\u540e\u8fde\u5728\u4e00\u8d77\u6210\u4e00\u6574\u4f53}
9.\u7269\u4f53m1\u4ee5v1\u521d\u901f\u5ea6\u4e0e\u9759\u6b62\u7684\u7269\u4f53m2\u53d1\u751f\u5f39\u6027\u6b63\u78b0:
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9.\u7535\u8def\u7684\u4e32/\u5e76\u8054 \u4e32\u8054\u7535\u8def(P\u3001U\u4e0eR\u6210\u6b63\u6bd4) \u5e76\u8054\u7535\u8def(P\u3001I\u4e0eR\u6210\u53cd\u6bd4)
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A:根据电势的决定式(我不知道你们老师讲了没有,我记得当时我们老师只是提了一下的,说课本不要求掌握...)φ=kQ/R, Q是产生电场的电荷的电荷量,需要代入符号,R表示该点到场源电荷的距离, 当遇到像这题的有2个电场叠加的情况求某一点的电势时,由于φ是标量,求代数和就行了. 这题从图里看得出来,Ra<Rb,所以φa>φb A错误
B:电场的强度是由电场线的疏密程度判断的,很显然Ea>Eb B错误
C:Wab=qUab (ab是角标), Uab就是φa-φb,在A选项里我们已经知道了Uab应该是个正值,但是由于是负电荷,q是小于0的,所以Wab小于0,即电场力做负功 C错误
D: 由公式E=qφ,,由于q为正,前面已经说了φa>φb,,所以Ea>Eb D正确
我不知道我说清楚了没有...
D A:当是-2q时两点电势才相等。B:电场线密度不同,故场强不同。C:负电荷受到的电场力方向为第四象限的某个角,因为电场强度为指向第二象限的某个角,所以做负功。D:a点的电势高,故正电荷在a点的电势能大。
答案:D 解释:根据等势面与电场线垂直的知识,你先过a和b两点作出两条等势面,由于电场线是由高等势面指向低等势面,电场线的疏密表示电场的强弱,电场力做正(负)功,电势能减少(增加),即可选出正确选项。
D
ab 所在直线受正电荷影响较大 极限一下把左边负电拿掉 一切都明了了....
绛旓細1銆佸帇鍔涘叕寮忥細F=P锛堝帇寮猴級*S锛堝彈鍔涢潰绉級2銆佸帇寮哄叕寮忥細P=F锛堝帇鍔涳級/S锛堝彈鍔涢潰绉級3銆佽川閲忓叕寮忥細m=瀵嗗害*v锛堜綋绉級4銆佸姛锛歐锛滷S锛滸h (鎶婄墿浣撲妇楂)5銆佸姛鐜囷細P锛漌/t锛滷V 6銆佸姛鐨勫師鐞嗭細W鎵嬶紳W鏈 7銆佸疄闄呮満姊帮細W鎬伙紳W鏈夛紜W棰濆 8銆佹満姊版晥鐜囷細畏锛漌鏈/W鎬 ...
绛旓細2011-12-25 楂樹簩鐗╃悊鐭ヨ瘑鐐规荤粨 381 2013-11-26 楂樹腑鐗╃悊鐨勬墍鏈夌煡璇嗙偣鍏紡 2012-06-25 楂樹腑鐗╃悊浼氳冨涔犵煡璇嗙偣璧勬枡 436 2009-09-10 楂樹腑鐗╃悊鐭ヨ瘑鐐瑰綊绾 316 2011-08-19 楂樹腑鐗╃悊鐭ヨ瘑鐐规荤粨澶у叏 919 2011-05-02 楂樹腑鐗╃悊鐭ヨ瘑鐐规荤粨 55 2010-08-17 楂樹腑鐗╃悊鐭ヨ瘑鐐规荤粨 25 2014-08-06 楂樹腑鐗╃悊蹇...
绛旓細楂樹腑鐗╃悊鍏紡澶у叏: (1)鐩寸嚎杩愬姩 1)鍖鍙橀熺洿绾胯繍鍔 1.骞冲潎閫熷害V骞=s/t(瀹氫箟寮) 2.鏈夌敤鎺ㄨVt2-Vo2=2as 3.涓棿鏃跺埢閫熷害Vt/2=V骞=(Vt+Vo)/2 4.鏈熷害Vt=Vo+at 5.涓棿浣嶇疆閫熷害Vs/2=[(Vo2+Vt2)/2]1/2 6.浣嶇Щs=V骞硉=Vot+at2/2=Vt/2t 7.鍔犻熷害a=(Vt-Vo)/t {浠o涓烘鏂瑰悜,a涓嶸o鍚...
绛旓細涓嬮潰鏄垜涓哄ぇ瀹舵敹闆嗘暣鐞嗙殑楂樹腑鐗╃悊蹇呬慨涓閲嶇偣鐭ヨ瘑,鐩镐俊杩欎簺鏂囧瓧瀵逛綘浼氭湁鎵甯姪鐨勩 楂樹腑鐗╃悊蹇呬慨涓閲嶇偣鐭ヨ瘑(涓) 1銆佺數瀛愪笌鐢佃嵎 鐢靛瓙鏄墿璐ㄤ腑鐨勪竴绉嶅熀鏈矑瀛,瀹冨甫璐熺數銆傜數鑽锋槸浜轰滑瀵圭數鐨勪竴绉嶄紶缁熺殑璁よ瘑銆傚湪鍙や唬,鍥犱汉浠鐢电殑鏈川缂轰箯璁よ瘑,璁や负鐢垫槸闄勭潃鍦ㄧ墿浣撹〃闈笂鐨,鍥犺屾妸鐢电О涓虹數鑽枫傜墿浣撯滃甫鐢碘濆拰鈥滃甫浜...
绛旓細2011-08-19 楂樹腑鐗╃悊鐭ヨ瘑鐐规荤粨 2009-09-10 楂樹腑鐗╃悊鐭ヨ瘑鐐瑰綊绾 315 2010-08-17 楂樹腑鐗╃悊鐭ヨ瘑鐐规荤粨 23 2011-08-19 楂樹腑鐗╃悊鐭ヨ瘑鐐规荤粨澶у叏 911 2012-08-21 楂樹腑鐗╃悊鐭ヨ瘑鐐瑰綊绾虫荤粨 11 2010-12-24 姹傞珮涓墿鐞嗙煡璇嗙偣澶у叏 37 2011-08-02 楂樹腑鐗╃悊鎬荤粨鐭ヨ瘑鐐 2010-07-29 楂樹竴鐗╃悊鐭ヨ瘑鐐规⒊鐞(蹇呬慨...
绛旓細鐗╃悊鍏紡鏄敤绗﹀彿琛ㄧず鐗╃悊閲忕殑涓绉嶈〃杈炬柟寮,鐢ㄥ紡瀛愯〃绀哄嚑涓墿鐞嗛噺涔嬮棿鐨勫叧绯绘槸鐗╃悊瑙勫緥鐨勭畝娲佸弽鏄犱篃鏄墿鐞嗚В棰樼殑鍏抽敭銆傝繖娆℃垜缁欏ぇ瀹舵暣鐞嗕簡楂樹腑鐗╃悊鍏紡 鎬荤粨 褰掔撼,渚涘ぇ瀹堕槄璇诲弬鑰冦傜洰褰 楂樹腑鐗╃悊鍏紡鎬荤粨褰掔撼 楂樹腑鐗╃悊瀛︿範鏂规硶鏈夊摢浜 楂樹腑鐗╃悊搴旇鎬庝箞鏍峰 楂樹腑鐗╃悊鍏紡鎬荤粨褰掔撼 涓銆佽川鐐圭殑杩愬姩(1)---鐩寸嚎杩愬姩1)鍖...
绛旓細鍐呭濡備笅锛氫竴銆佸寑鍙橀熺洿绾胯繍鍔 骞冲潎閫熷害V骞=s/t(瀹氫箟寮),涓棿鏃跺埢閫熷害Vt/2=V骞=(Vt+Vo)/2,鏈熷害Vt=Vo+at,浣嶇Щs=V骞硉=Vot+at2/2=Vt/2t銆備簩銆佽嚜鐢辫惤浣撹繍鍔 鍒濋熷害Vo=0,鏈熷害Vt=gt,涓嬭惤楂樺害h=gt2/2銆備笁銆佺珫鐩翠笂鎶涜繍鍔 浣嶇Щs=Vot-gt2/2,鏈熷害Vt=Vo-gt (g=9.8m/s2鈮10m/s2)...
绛旓細鎺ヤ笅鏉ユ槸鎴戜负澶у鏁寸悊鐨楂樹腑鐗╃悊鐭ヨ瘑鐐规荤粨,甯屾湜澶у鍠滄! 楂樹腑鐗╃悊鐭ヨ瘑鐐规荤粨涓 纰版挒闂褰掔被 涓銆佺鎾炵殑瀹氫箟 鐩稿杩愬姩鐨勭墿浣撶浉閬,鍦ㄦ瀬鐭殑鏃堕棿鍐,閫氳繃鐩镐簰浣滅敤,杩愬姩鐘舵佸彂鐢熸樉钁楀彉鍖栫殑杩囩▼鍙仛纰版挒銆 浜屻佺鎾炵殑鐗圭偣 浣滅敤鏃堕棿鏋佺煭,鐩镐簰浣滅敤鐨勫唴鍔涙瀬澶,鏈変簺纰版挒灏界澶栧姏涔嬪拰涓嶄负闆,浣嗕竴鑸鍔(濡傞噸鍔涖佹懇鎿﹀姏绛)...
绛旓細楂樹腑鐗╃悊涓鍏变竷鏈功锛屽垎鍒槸锛氬繀淇竴銆佸繀淇簩銆侀変慨3-1銆侀変慨3-2銆侀変慨3-3銆侀変慨3-4銆侀変慨3-5.蹇呬慨涓锛屼富瑕佽瑙e寑鍙橀熺洿绾胯繍鍔ㄣ佸姏涓庤繍鍔ㄣ佺墰椤胯繍鍔ㄥ畾寰嬬瓑鐩稿叧鐭ヨ瘑銆傛湰閮ㄥ垎鏄珮涓墿鐞嗙殑鍩虹锛岃繍鍔ㄧ殑鐩稿叧璁$畻銆佸彈鍔涘垎鏋愪笌鍔涚殑鍒嗚В銆佺墰椤胯繍鍔ㄥ畾寰嬬殑搴旂敤锛屽湪楂樿冧腑杩欓儴鍒嗛噸鐐硅冨療鐨勬槸鍏充簬鍔涘瀹為獙鐨...
绛旓細瑕佽璧烽珮涓樁娈垫渶闅剧殑鏄摢闂ㄨ绋嬶紝寰堝浜洪兘浼氳寰楁槸鐗╃悊銆傜壒鍒槸寰堝濂崇敓锛屽埌浜嗛珮涓互鍚庯紝鏈瀹虫曠殑灏辨槸鐗╃悊銆傝寰楃墿鐞嗙壒鍒繁濂ワ紝寰堥毦鐞嗚В銆傛浘缁忔湁寰堝濂冲鐢熷埌浜嗕腑瀛﹀悗锛岃窡鑰佸笀璇粹滅墿鐞嗏濆氨鏄ぉ涔︺傚緢澶氬鐢熶篃鏄洜涓哄鎬曠墿鐞嗭紝鍦ㄦ枃鐞嗗垎绉戠殑鏃跺欙紝鎵嶄細閫夋嫨鏂囩銆傜浜屻佺墿鐞嗕负浠涔堥毦瀛︼紵楂樹腑鐗╃悊涓轰粈涔堥毦瀛...