(2011?杨浦区一模)如图所示,实心均匀正方体A、B放置在水平地面上,它们的高度分别为0.2米和0.1米,A的 (2012?杨浦区一模)如图所示,甲、乙两实心均匀正方体分别...
\uff082011?\u5609\u5b9a\u533a\u4e00\u6a21\uff09\u5982\u56fe\u6240\u793a\uff0c\u6a2a\u622a\u9762\u4e3a\u6b63\u65b9\u5f62\u7684\u5b9e\u5fc3\u5747\u5300\u957f\u65b9\u4f53A\u3001B\u653e\u7f6e\u5728\u6c34\u5e73\u5730\u9762\u4e0a\uff0c\u5b83\u4eec\u7684\u9ad8\u5ea6\u5206\u522b\u4e3a0\uff081\uff09pA=FASAmAgSA=\u03c1AghASA=\u03c1AghA=2\u00d7103\u5343\u514b/\u7c733\u00d79.8/\u5343\u514b\u00d70.2\u7c73=3.92\u00d7103\u5e15\uff082\uff09FB=GB=mBg=1\u5343\u514b\u00d79.8\u725b/\u5343\u514b=9.8\u725b SB=hBL=0.1\u7c73\u00d70.4\u7c73=0.04\u7c732\u2234pB=FBSB=9.8\u725b0.04\u7c732=245\u5e15 \uff083\uff09\u82e5\u5728\u957f\u65b9\u4f53A\u4e0a\u6cbf\u7ad6\u76f4\u65b9\u5411\u622a\u53bb\u56db\u5206\u4e4b\u4e00\uff0c\u5219A\u5bf9\u5730\u9762\u7684\u538b\u529b\u548c\u53d7\u529b\u9762\u79ef\u5747\u51cf\u5c0f\u4e3a\u539f\u6765\u7684\u56db\u5206\u4e4b\u4e09\uff0c\u6240\u4ee5\u538b\u5f3a\u4e0d\u53d8\uff0e\u4ecd\u4e3a3.92\u00d7103\u5e15\uff0e\u7b54\uff1a\uff081\uff09A\u5bf9\u6c34\u5e73\u5730\u9762\u7684\u538b\u5f3a\u4e3a3.92\u00d7103\u5e15\uff1b\uff082\uff09B\u5bf9\u6c34\u5e73\u5730\u9762\u7684\u538b\u5f3a\u4e3a245\u5e15\uff1b\uff083\uff09A\u5269\u4f59\u90e8\u5206\u5bf9\u6c34\u5e73\u5730\u9762\u7684\u538b\u5f3a\u4e3apA\u2032\u4e3a3.92\u00d7103\u5e15\uff0e
\u56e0\u4e3a\u6b63\u65b9\u4f53\u5bf9\u6c34\u5e73\u5730\u9762\u7684\u538b\u529b\u76f8\u540c\uff0c\u6240\u4ee5\u7532\u4e59\u7684\u8d28\u91cf\u76f8\u7b49\uff0c\u8bbe\u90fd\u4e3am\uff0e\u53c8\u5207\u53bb\u8d28\u91cf\u76f8\u7b49\uff0c\u5219\u5207\u53bb\u7684\u6bd4\u4f8b\u76f8\u540c\uff0e\u5269\u4e0b\u7684\u6bd4\u4f8b\u4e5f\u76f8\u540c\uff0e\u8bbe\u6bd4\u4f8b\u7cfb\u6570\u4e3an\uff0eV\u7532V\u4e59=m\u7532\u03c1\u7532m\u4e59\u03c1\u4e59=m\u7532\u03c1\u7532\u00d7\u03c1\u4e59m\u4e59=m1\u00d7103kg/m3\u00d78\u00d7103kg/m3m=81\u2235\u7532\u3001\u4e59\u4e24\u4e2a\u5b9e\u5fc3\u6b63\u65b9\u4f53\uff0c\u2234S\u7532S\u4e59=41p\u7532p\u4e59=F\u7532S\u7532\u2032F\u4e59S\u4e59\u2032=F\u7532S\u7532\u2032\u00d7S\u4e59\u2032F\u4e59=nS\u4e59nS\u7532=14\u7b54\uff1a\u53e0\u653e\u540e\u6c34\u5e73\u5730\u9762\u53d7\u5230\u7532\u3001\u4e59\u4e24\u7269\u4f53\u7684\u538b\u5f3a\u4e4b\u6bd4\u4e3a1\uff1a4\uff0e
(1)mA=ρAVA=2×103kg/m3×(0.2m)3=16kg.答:A的质量为16kg.
(2)FB=GB=mBg=1kg×9.8N/kg=9.8N,
PB=
FB |
SB |
9.8N |
(0.1m)2 |
答:B对水平地面的压强为980Pa.
(3)
GA |
GB |
mA |
mB |
16 |
1 |
SA |
SB |
4 |
1 |
若
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