几道初二的密度物理题 几道初中密度物理题
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2. \u91d1\u5c5e\u7684\u8d28\u91cf\u662f6750\u5343\u514b\uff0c\u4f53\u79ef\u662f2.5\u7c733\u8fd9\u5757\u91d1\u5c5e\u7684\u5bc6\u5ea6\u662f\u591a\u5c11\uff1f\u82e5\u5c06\u8fd9\u5757\u91d1\u5c5e\u622a\u53bb2/3\uff0c\u5269\u4e0b\u90e8\u5206\u7684\u5bc6\u5ea6\u662f\uff1f3.\u94c1\u7684\u5bc6\u5ea6\u662f7.8\u00d710 3\u5343\u514b/\u7c733\uff0c20\u5206\u7c733\u94c1\u5757\u7684\u8d28\u91cf\u662f\u591a\u5c11\uff1f
4\u4e00\u4e2a\u74f6\u5b50\u88c5\u6ee1\u6c34\u65f6,\u603b\u8d28\u91cf\u4e3a1.3\u5343\u514b.\u88c5\u6ee1\u7164\u6cb9\u65f6,\u603b\u8d28\u91cf\u4e3a1.14\u5343\u514b.\u6c42\u7a7a\u74f6\u7684\u8d28\u91cf.\uff1f
5\u77e5\u51b0\u7684\u5bc6\u5ea6\u4e3a0.9\u00d7103Kg/m3\uff0c\u5219\u4e00\u5757\u4f53\u79ef\u4e3a80 cm3\u7684\u51b0\u5168\u90e8\u7194\u5316\u4e3a\u6c34\u540e\uff0c\u6c34\u7684\u8d28\u91cf\u662f\u591a\u5c11g\uff0c\u6c34\u7684\u4f53\u79ef\u662f\u591a\u5c11cm3.
6\uff0e\u67d0\u516c\u56ed\u8981\u94f8\u4e00\u5c0a\u94dc\u50cf\uff0c\u5148\u7528\u6728\u6750\u5236\u6210\u4e00\u5c0a\u4e0e\u94dc\u50cf\u5927\u5c0f\u4e00\u6837\u7684\u6728\u6a21\uff0c\u73b0\u6d4b\u5f97\u6728\u6a21\u8d28\u91cf\u4e3a63Kg\uff0c\uff08\u03c1\u6728=0.7\u00d7103Kg/m3\uff0c\u03c1\u94dd=8.9\u00d7103Kg/m3\uff09\u95ee\uff1a\u9700\u8981\u591a\u5c11\u5343\u514b\u94dc\u624d\u80fd\u94f8\u6210\u6b64\u94dc\u50cf\uff1f
7.\u6709\u4e00\u79cd\u7eaa\u5ff5\u5e01\uff0c\u5b83\u7684\u8d28\u91cf\u662f16.1\u514b\uff0e\u4e3a\u4e86\u6d4b\u91cf\u5b83\u7684\u4f53\u79ef\uff0c\u628a\u5b83\u653e\u5165\u4e00\u76db\u6ee1\u6c34\u7684\u91cf\u7b52\u4e2d\uff0c\u6d4b\u5f97\u6ea2\u51fa\u7684\u6c34\u8d28\u91cf\u4e3a1\uff0e8\u514b\u3002\uff081\uff09\u6c42\u5236\u4f5c\u7eaa\u5ff5\u5e01\u7684\u91d1\u5c5e\u5bc6\u5ea6\uff1b\uff082\uff09\u8bf4\u8fd9\u79cd\u91d1\u5c5e\u7684\u540d\u79f0\u3002�6�9�6�98\uff0e\u90d1\u5c0f\u80d6\u5bb6\u7684\u4e00\u53ea\u74f6\u5b50\uff0c\u4e700.5kg\u9152\u521a\u597d\u88c5\u6ee1\u3002\u5c0f\u80d6\u7528\u8fd9\u53ea\u74f6\u5b50\u53bb\u4e700.5kg\u9171\u6cb9\uff0c\u7ed3\u679c\u6ca1\u6709\u88c5\u6ee1\uff0c\u5c0f\u80d6\u4ee5\u4e3a\u8425\u4e1a\u5458\u5f04\u9519\u4e86\u3002\u73b0\u5728\u8bf7\u4f60\u601d\u8003\u4e00\u4e0b\uff0c\u5230\u5e95\u662f\u8c01\u5f04\u9519\u4e86\uff1f\uff08\u03c1\u9152=0.8\u00d7103 kg/m3\uff0c\u03c1\u9171\u6cb9=1.13\u00d7103 kg/m3\uff099.\u4e00\u7a7a\u74f6\u88c5\u6ee1\u6c34\u540e\u8d28\u91cf\u4e3a64g\uff0c\u5c06\u6c34\u5012\u51fa\u88c5\u6ee1\u9152\u7cbe\u4e3a56g\uff0c\u6c42\u7a7a\u74f6\u7684\u5bb9\u79ef\uff1f10. \u4f53\u79ef\u662f50cm3\u7684\u94dd\u7403\uff0c\u5b83\u7684\u8d28\u91cf\u662f54g\uff0c\u95ee\u8fd9\u4e2a\u94dd\u7403\u662f\u7a7a\u5fc3\u7684\u8fd8\u662f\u5b9e\u5fc3\u7684\uff1f\u82e5\u662f\u7a7a\u5fc3\u7684\uff0c\u7a7a\u5fc3\u90e8\u5206\u4f53\u79ef\u4e3a\u591a\u5927\uff1f\uff08\u03c1\u94dd\uff1d2.7\u00d7103kg/m3\uff09
11.\u4e00\u4e2a\u74f6\u5b50\u80fd\u76db1\u5343\u514b\u6c34\uff0c\u7528\u8fd9\u4e2a\u74f6\u5b50\u80fd\u76db\u591a\u5c11\u5343\u514b\u9152\u7cbe\uff1f
12. \u6709\u4e00\u7a7a\u74f6\u5b50\u8d28\u91cf\u662f50\u514b\uff0c\u88c5\u6ee1\u6c34\u540e\u79f0\u5f97\u603b\u8d28\u91cf\u4e3a250\u514b\uff0c\u88c5\u6ee1\u53e6\u4e00\u79cd\u6db2\u4f53\u79f0\u5f97\u603b\u8d28\u91cf\u4e3a200\u514b\uff0c\u6c42\u8fd9\u79cd\u6db2\u4f53\u7684\u5bc6\u5ea6\u3002
13.\u67d0\u540c\u5b66\u4ece\u4e00\u5747\u5300\u5927\u5ca9\u77f3\u4e0a\u7838\u4e0b\u4e00\u5c0f\u5757\u5ca9\u77f3\uff0c\u7528\u5929\u5e73\u79f0\u5f97\u8d28\u91cf\u662f27g\u3002\u653e\u5165\u88c5\u670980ml\u6c34\u7684\u91cf\u7b52\u4e2d\uff0c\u6c34\u9762\u5347\u523090ml\uff0c\u8fd9\u5757\u5ca9\u77f3\u7684\u5bc6\u5ea6\u662f\u591a\u5c11kg/m3
14.\u5c0f\u660e\u5728\u5b66\u6821\u8fd0\u52a8\u4f1a\u4e0a\u83b7\u5f97\u4e00\u5757\u5956\u724c\uff0c\u4ed6\u60f3\u77e5\u9053\u8fd9\u5757\u5956\u724c\u662f\u5426\u7531\u7eaf\u94dc\u5236\u6210\uff0c\u4e8e\u662f\u4ed6\u7528\u5929\u5e73\u548c\u91cf\u676f\u5206\u522b\u6d4b\u51fa\u8be5\u5956\u724c\u7684\u8d28\u91cf\u548c\u4f53\u79ef\u4e3a14g\u548c2cm3\uff0c\u5e76\u7b97\u51fa\u4ed6\u7684\u5bc6\u5ea6\u4e3a\u591a\u5c11g/cm3\uff1f\u5c0f\u660e\u901a\u8fc7\u67e5\u5bc6\u5ea6\u8868\u77e5\u9053\uff0c\u94dc\u7684\u5bc6\u5ea6\u4e3a8.9\u00d7103kg/m3\uff0c\u7531\u6b64\u4ed6\u5224\u65ad\u8be5\u5956\u724c_____\u7531\u7eaf\u94dc\u5236\u6210\u7684\uff08\u9009\u586b\u201c\u662f\u201d\u6216\u201c\u4e0d\u662f\u201d\uff09\u3002
15.\u4e00\u4e2a\u91cf\u7b52\uff0c\u5185\u88c580\u6beb\u5347\u9152\u7cbe\uff0c\u603b\u8d28\u91cf\u662f144\u514b\u3002\u82e5\u5c06\u9152\u7cbe\u5012\u51fa\u6539\u88c5\u6c34\uff0c\u603b\u8d28\u91cf\u662f124\u514b\uff0c\u95ee\uff081\uff09\u91cf\u7b52\u7684\u8d28\u91cf\u662f\u591a\u5c11\u514b\uff1f\uff082\uff09\u91cf\u7b52\u5185\u88c5\u4e86\u591a\u5c11\u6beb\u5347\u6c34\uff1f\uff08\u03c1\u6c34=1.0\u00d7103\u5343\u514b/\u7c733\u3001\u03c1\u9152\u7cbe=0.8\u00d7103\u5343\u514b/\u7c733\uff0916. \uff0e\u5c0f\u660e\u5728\u73a9\u800d\u65f6\u628a\u4e00\u5c0f\u94c1\u7403\u629b\u5165\u6c34\u4e2d\uff0c\u4ed6\u53d1\u73b0\u94c1\u7403\u6d6e\u5728\u6c34\u9762\u4e0a.\u5c0f\u660e\u60f3\uff1a\u94c1\u7403\u4e3a\u4ec0\u4e48\u6d6e\u5728\u6c34\u9762\u4e0a\uff1f\u4ed6\u4f5c\u51fa\u7684\u731c\u60f3\u662f\uff1a\u94c1\u7403\u53ef\u80fd\u662f\u7a7a\u5fc3\u7684\u3002\u4ed6\u60f3\u8bbe\u8ba1\u5b9e\u9a8c\u8fdb\u884c\u63a2\u7a76\uff0c\u4ed6\u9700\u8981\u7684\u5b9e\u9a8c\u5668\u6750\u5e94\u8be5\u6709
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79 60 75
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17\uff0e\u201c\u4e4c\u9e26\u559d\u6c34\u201d\u7684\u6545\u4e8b\u4f60\u4e0d\u964c\u751f\u5427\uff0e\u5982\u56fe\u6240\u793a\uff0c\u82e5\u6709\u4e00\u53ea\u5bb9\u79ef\u4e3a3\u00d710-4m3\u7684\u74f6\u5185\u76db\u67090.2kg\u7684\u6c34\uff0c\u4e00\u53ea\u53e3\u6e34\u7684\u4e4c\u9e26\u6bcf\u6b21\u5c06\u4e00\u5757\u8d28\u91cf\u4e3a10g\u7684\u5c0f\u77f3\u5b50\u6295\u5165\u74f6\u4e2d\uff0c\u5f53\u4e4c\u9e26\u6295\u5165\u4e8625\u5757\u76f8\u540c\u7684\u5c0f\u77f3\u5b50\u540e\uff0c\u6c34\u9762\u5347\u5230\u74f6\u53e3\uff0c\u6c42\uff1a\uff081\uff09\u74f6\u5185\u77f3\u5757\u7684\u603b\u4f53\u79ef\uff1b\uff082\uff09\u77f3\u5757\u7684\u5bc6\u5ea6\uff0e18\uff0e\u6709\u4e00\u79cd\u7eaa\u5ff5\u5e01\uff0c\u5b83\u7684\u8d28\u91cf\u662f16.1\u514b\uff0e\u4e3a\u4e86\u6d4b\u91cf\u5b83\u7684\u4f53\u79ef\uff0c\u628a\u5b83\u653e\u5165\u4e00\u76db\u6ee1\u6c34\u7684\u91cf\u7b52\u4e2d\uff0c\u6d4b\u5f97\u6ea2\u51fa\u7684\u6c34\u91cd\u4e3a1.8\u00d710\uff0d2\u725b\uff0e
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\u6750\u6599 \u6811\u8102\u955c\u7247 \u73bb\u7483\u955c\u7247 \u94dc\u5408\u91d1 \u949b\u5408\u91d1
\u900f\u5149\u91cf 92% 91%
\u5bc6\u5ea6/kg\u00b7m-3 1.3\u00d7103 2.5\u00d7103 8.0\u00d7103 4.5\u00d7103
\u6027\u80fd \u8f83\u8010\u78e8\u635f \u8010\u78e8\u635f \u8f83\u8010\u78e8\u635f \u8010\u8150\u8680
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\uff082\uff09 \u5982\u56fe12\u6240\u793a,\u4e00\u526f\u94dc\u5408\u91d1\u67b6\u7684\u8d28\u91cf\u4e3a2\u00d710-2kg,\u82e5\u4ee5\u949b\u5408\u91d1\u4ee3\u66ff\u94dc\u5408\u91d1,\u6c42\u4e00\u526f\u4ee5\u949b\u5408\u91d1\u955c\u67b6\u7684\u8d28\u91cf.
20\uff0e\u8001\u677f\u6d3e\u5c0f\u59da\u53bb\u8ba2\u8d2d\u9152\u7cbe\uff0c\u5408\u540c\u4e0a\u8981\u6c42\u9152\u7cbe\u7684\u5bc6\u5ea6\u5c0f\u4e8e\u6216\u8005\u662f\u7b49\u4e8e0.82g/cm3\u5c31\u7b97\u8fbe\u6807\uff0c\u5c0f\u59da\u5728\u62bd\u6837\u68c0\u67e5\u65f6\uff0c\u53d6\u9152\u7cbe\u7684\u6837\u672c500ml\uff0c\u79f0\u5f97\u7684\u8d28\u91cf\u662f420g. \u8bf7\u4f60\u901a\u8fc7\u8ba1\u7b97\u8bf4\u660e\u5c0f\u59da\u7684\u7ed3\u8bba\u662f (A \u8fbe\u6807 B \u4e0d\u8fbe\u6807\uff0c\u542b\u6c34\u592a\u591a) \u4f60\u8ba4\u4e3a\u5c0f\u59da\u8be5\u600e\u4e48\u529e?
(\u03c1\u9152=0.8\u00d7103 kg/m3 \u03c1\u6c34=1.0\u00d7103 kg/m3)
21\uff0e. \u5b9e\u9a8c\u5ba4\u6709\u4e0b\u5217\u56db\u79cd\u91cf\u7b52\uff0c\u5206\u522b\u6807\u6709\u6700\u5927\u523b\u5ea6\u503c\u548c\u6700\u5c0f\u523b\u5ea6\u503c\uff0c\u8981\u4e00\u6b21\u8f83\u51c6\u786e\u91cf\u51fa100 g\u5bc6\u5ea6\u4e3a0.8\u00d7103 kg/m3\u7684\u9152\u7cbe\uff0c\u5219\u9009\u7528\u7684\u91cf\u7b52\u5e94\u8be5\u662f \uff08 \uff09
A\u3001500ml 10ml B\u3001 100ml 2ml C\u3001250ml 5ml D\u300150ml 2ml22\uff0e\u67d0\u540c\u5b66\u7528\u4e00\u53ea\u73bb\u7483\u676f\uff0c\u6c34\u548c\u5929\u5e73\u6d4b\u4e00\u5757\u77f3\u5b50\u7684\u5bc6\u5ea6\u3002\u4ed6\u628a\u676f\u5b50\u88c5\u6ee1\u6c34\u540e\u79f0\u5f97\u603b\u8d28\u91cf\u662f200g\uff0c\u653e\u5165\u77f3\u5b50\u540e\uff0c\u5c06\u6c34\u6ea2\u51fa\u4e00\u90e8\u5206\u4ee5\u540e\u79f0\u5f97\u603b\u8d28\u91cf\u662f215g\uff0c\u628a\u77f3\u5b50\u4ece\u676f\u4e2d\u53d6\u51fa\uff0c\u79f0\u5f97\u6c34\u548c\u676f\u5b50\u7684\u8d28\u91cf\u4e3a190g\uff0c\u6c42\u77f3\u5b50\u7684\u5bc6\u5ea6\u300223\uff0e\u5c0622g\u76d0\u5b8c\u5168\u6eb6\u89e3\u5728\u5982\u56fe13\u7532\u6240\u793a\u7684\u91cf\u7b52\u5185\u7684\u6c34\u4e2d\uff0c\u6db2\u9762\u5347\u9ad8\u540e\u7684\u4f4d\u7f6e\u5982\u56fe\u4e59\u6240\u793a\u3002\u5219\u76d0\u6c34\u7684\u7684\u5bc6\u5ea6\u4e3a\u591a\u5c11\uff1f
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\u5355\u4f4d\u6362\u7b97\uff0c\u6559\u4f60\u4e2a\u7a8d\u95e8\uff0c\u56e0\u4e3a1dm=10cm\uff0c\u5de6\u53f3\u540c\u65f6\u4e58\u4ee53\u6b21\u65b9\uff0c\u5f97\u52301dm³=1000cm³\uff0c\u6c34\u53d8\u51b0\u8d28\u91cf\u4e0d\u53d8\u4f53\u79ef\u4f1a\u53d8\u5927\uff0c\u6240\u4ee5p=m/v\uff0c\u51b0\u7684\u5bc6\u5ea6\u8981\u5c0f\u4e8e\u6c34\u7684\u5bc6\u5ea6\uff0c\u5bc6\u5ea6\u4e0e\u7269\u8d28\u72b6\u6001\u6709\u5173\u3002\u6db2\u6001\u53d8\u6210\u4e86\u56fa\u6001\u3002
\u6c27\u6c14\u8d28\u91cf\u53d8\u4e3a\u4e00\u534a\uff0c\u4f53\u79ef\u4e0d\u4f1a\u53d8\uff0c\u56e0\u4e3a\u6c14\u4f53\u6ca1\u6709\u56fa\u5b9a\u5f62\u6001\uff0c\u4f1a\u5145\u6ee1\u5bb9\u5668\uff0cp=m/v\uff0c\u5bc6\u5ea6\u53d8\u4e3a\u539f\u6765\u7684\u4e00\u534a\u5c31\u662f2.5
1L=1dm³=0.001m³\uff0c\u8d28\u91cf\u4e3a0.8Kg
0.2kg\u7684\u6c34\u4f53\u79ef\u662f0.2dm³=200ml=200cm³\uff0c\u6240\u4ee5\u77f3\u5934\u4f53\u79ef\u4e3a250ml\uff0c\u77f3\u5934\u5bc6\u5ea62.6\u00d710³kg/m³=2.6g/ml
\u8d28\u91cf\u4e3a\uff082.6*250\uff09g
(15*24)/(200-80)=3
2.
铁的密度：7.9g/cm^2
234/7.9=30
（体积是80平方厘米？？？？？）
立方厘米……&
80-30=50
空心的，体积50立方厘米
3.
9000/1=9000cm^3
100000/9000=11（水稻的密度）
4.5*1000000/11=409090g=0.4吨
填空：
3.——————1：2
4.不相等，密度
5.（拉到2倍吧？？？）4倍，不变
6.50千克推理得到50升，体积就是：0.05立方米。
朋友啊……你单位错好多……
考试的单位要小心哦
xiexie
这些个题我认为自己好好看下就可以答得出来！
好多~~现在还要吗？？
2题：因为铁的密度(1立方米）为7.9乘10的三次方kg/m3(3为次数）为密度1，有应为M铁=234，V铁=80CM（3)，所以P2(铁）为2.925，所以，P2<P1，所以，为空心。 一 问
（1）、V水=m水/ρ水 V水=80g/1 V水=80CM3
V石=V空=200CM3-80CM3=120CM3
M石=15g*24=360g
ρ=m/V=360g/120cm3=3gCM3
（2）、V铁=m/ρ=234g*7.8=30CM3
V空=V总-V铁=80cm3-30cm3=50cm3
（3）、V水=m/ρ=9kg/1000=0.009M3
Ρ稻谷=m/V=100/0.009M3
M总=100/0.009*4.5m2=50000kg=50吨
（4）、同种材料所以密度为 1：1
Ρ=m/ V 体积与质量成正比 所以 m甲：m已=2：1
（5）、2倍（长度越长电阻越大吧？） 密度不变
（6）、V=m/ρ=50kg/1000ka=0.05M3
1.p石=m石/v石=360g/120cm=3
2.
p铁=7.9g/cm^2
解：p=m/v=234/80=2.925g/cm^2不等于p铁。
所以是空心的
（2）80-30=50cm^3
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绛旓細涓銆50/3=16.67 榛勯噾鐨勫瘑搴杈冨ぇ,涓19.26鍏/绔嬫柟鍘樼背 鎵浠ヤ笉鏄函閲戠殑 浜屻佸凡鐭ユ按鐨勫瘑搴︽槸1鍏嬫瘡绔嬫柟鍘樼背 0.1绔嬫柟鍒嗙背=100绔嬫柟鍘樼背 鍒0.9鍗冨厠鐨勬按浣撶Н鏄1*900=900绔嬫柟鍘樼背 鍐扮殑瀵嗗害灏辨槸900鍏/锛100+900锛=0.9鍏嬫瘡绔嬫柟鍘樼背 涓夈侀搧鐞冪殑瀵嗗害鏄79/锛75-60锛=5.267鍏嬫瘡绔嬫柟鍘樼背 灏忎簬7.8 ...
绛旓細1.瀵嗗皝鐨勫６鍚э紝鍔犵儹姘达紝澹跺唴姘斿帇鍗囬珮锛屼綋绉彉灏忥紝瀵嗗害鍙樺ぇ锛屽拷鐣ヨ捀鍙戣川閲忎笉鍙 2.m涔嬫瘮锛漰涔嬫瘮脳v涔嬫瘮 so m涔嬫瘮鍗砿1/m2=(4/3)*(1/2)=2:3 3.m=p*v 鍥犱负m1=m2 鎵浠1*v1=p2*v2 鍙坴锛漵*h 鎵浠1脳s1脳h1锛漰2脳s2脳h2 锛圓锛塻1锛4脳s2锛宲1锛(p2)/2,瀵煎叆锛圓锛夛紙p2)/2脳...
绛旓細锛1锛夋恫浣鐨勫瘑搴锛涳紙2锛夊鍣ㄧ殑璐ㄩ噺銆傝В鏋愶細杩欐槸涓閬撳湪瀹為獙鎺㈢┒鐨勫熀纭璁剧疆鐨勭浉鍏虫暟瀛楀鐞嗙殑璁＄畻棰橈紝鎶婁袱娆＄殑浣撶Н鐩稿噺灏辨槸澧炲姞鐨勪綋绉紝鎶婁袱娆＄殑鎬昏川閲忕浉鍑忓氨鏄鍔犵殑璐ㄩ噺锛屽啀鎶婂鍔犵殑璐ㄩ噺闄や互澧炲姞鐨勪綋绉氨鏄恫浣撶殑浣撶Н銆傜瓟妗堬細(1)m娑=m2-m1=12.8g-10.7 g=2.1g v娑=v2-v1=7.9cm³-5....
绛旓細=20cm³7.鍜岀鍏鍋氭硶涓鏍凤紝绌哄績鐨勪綋绉负160cm³濡傛灉鍦ㄧ┖蹇冮儴鍒嗘敞婊℃按鍚庯紝鎬昏川閲忔槸540g+160*1=700g 8.瑁呮按鐨勪綋绉负锛15-10锛/1=5 娌鐨勫瘑搴=锛11-10锛/5=0.2g/cm³9.鏂规硶鍜岀鍏涓鏍凤紝姘寸殑浣撶Н涓200 杩欑娑蹭綋鐨勫瘑搴=锛300-50锛/200=1.25g/cm³
绛旓細1.(15*24)/(200-80)=3 2.閾鐨勫瘑搴锛7.9g/cm^2 234/7.9=30 锛堜綋绉槸80骞虫柟鍘樼背锛燂紵锛燂級绔嬫柟鍘樼背鈥︹& 80-30=50 绌哄績鐨勶紝浣撶Н50绔嬫柟鍘樼背 3.9000/1=9000cm^3 100000/9000=11锛堟按绋荤殑瀵嗗害锛4.5*1000000/11=409090g=0.4鍚 濉┖锛3.鈥斺斺1锛2 4.涓嶇浉绛夛紝瀵嗗害 5.锛堟媺鍒2鍊嶅惂锛
绛旓細绛旓細杩欎釜閲戝睘鐞鐨勫瘑搴鏄10.25*10^3kg/m^3 2銆傝В锛氾紙1锛夌敱棰樻剰鍙煡 V姘=V閰掔簿 璁剧┖鐡惰川閲忎负m鐡 鍒(320g-m)/1g/cm^3=(280g-m)/0.8g/cm^3 320g-m=350g-1.25m 0.25m=30g m=120g 锛2锛夌摱瀛愮殑瀹圭Н V=(280g-120g)/0.8g/cm^3 V=200cm^3 绛旓細绌虹摱鐨勮川閲忔槸120g锛岀摱鐨勫绉槸...
绛旓細鍥犳鐡跺瓙瀹圭Нv=m/蟻姘=400cm^3 鐢辩摱鍜岄噾灞為绮掔殑鎬昏川閲忎负990鍏嬪彲寰楅噾灞炶川閲=990g-m=890g 閲戝睘棰楃矑鍜屾按鐨勬昏川閲忓鏋滄槸1.29鍗冨厠灏辫鏄棰樼洰鏈韩鏈闂锛屽洜涓鸿繖鏃堕噾灞炶川閲890g锛屾按璐ㄩ噺绛変簬1290g-990g=300g锛岀劧鍚庢眰姘寸殑浣撶НV锛岄噾灞炵殑浣撶НV閲戯紝閲戝睘棰楃矑瀵嗗害鍙互寰楀埌鍟︺傘
