4道初二的物理密度计算题 麻烦提供20道初二物理电学计算题附带答案 谢谢
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2;\u7b97\u8d28\u91cfm=\u5bc6\u5ea6\u00d7\u4f53\u79ef\uff0c\u770b\u770b\u4e8e\u9898\u76ee\u7684\u8d28\u91cf\u6bd4\u8f83\u5927\u5c0f\uff0c\u76f8\u7b49\u662f\u5b9e\u5fc3\uff0c\u5982\u4e0d\u76f8\u7b49\u3002\u7528(\u9898\u76ee\u7ed9\u7684-\u7b97\u51fa\u7684)\u00f7\u5bc6\u5ea6\u3002\u5c31\u662f\u7a7a\u51fa\u7684\u4f53\u79ef\u3002
3;\u7b97\u51fa\u6ca1\u8282\u8fd0\u7684\u8d28\u91cf=\u5bc6\u5ea6*\u4f53\u79ef\u3002\u518d\u7528\u603b\u8d28\u91cf\u00f7\u7b97\u51fa\u7684\u8d28\u91cf\u3002\u5c31\u662f\u9700\u8981\u7684\u8282\u6570\u3002
4;\u5148\u7b97;\u4f53\u79ef=\u8d28\u91cf\u00f7\u5bc6\u5ea6\u3002\u518d\u7528\u4f53\u79ef\u00f7\u9762\u79ef\u3002\u5c31\u662f\u6240\u8c13\u7684\u957f\u5ea6\u3002
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\u5d07\u6587\u533a2008-2009\u5b66\u5e74\u5ea6\u7b2c\u4e8c\u5b66\u671f\u521d\u4e09\u7edf\u4e00\u7ec3\u4e60(\u4e00)
\u7269 \u7406 2009.5
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\u77e5 1\uff0e\u672c\u8bd5\u5377\u5171\u4e94\u9053\u5927\u9898\uff0c35\u9053\u5c0f\u9898\u3002\u6ee1\u5206100\u5206\uff0c\u8003\u8bd5\u65f6\u95f4120\u5206\u949f\u3002
2\uff0e\u5728\u7b54\u9898\u5361\u4e0a\u51c6\u786e\u586b\u6d82\u3001\u4e66\u5199\u5b66\u6821\u3001\u59d3\u540d\u3001\u8003\u53f7
3\uff0e\u8003\u751f\u987b\u6309\u8981\u6c42\u5728\u7b54\u9898\u5361\u4e0a\u4f5c\u7b54\uff0c\u5728\u8bd5\u5377\u4e0a\u4f5c\u7b54\u65e0\u6548\u3002\u8003\u8bd5\u7ed3\u675f\uff0c\u4ec5\u4ea4\u56de\u7b54\u9898\u5361\u3002
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1\uff0e \u4e0b\u5217\u7269\u7406\u91cf\u4e0e\u5bf9\u5e94\u5355\u4f4d\u6b63\u786e\u7684\u662f
A . \u7535\u538b\u2014V\uff08\u4f0f\uff09 B . \u7535\u963b\u2014W\uff08\u74e6\uff09
C\uff0e\u7535\u6d41\u2014C\uff08\u5e93\uff09 D. \u7535\u529f\u7387\u2014J\uff08\u7126\uff09
2\uff0e \u5173\u4e8e\u5149\u73b0\u8c61\uff0c\u4e0b\u5217\u8bf4\u6cd5\u4e2d\u6b63\u786e\u7684\u662f
A\uff0e\u65e5\u98df\u3001\u6708\u98df\u7684\u5f62\u6210\u662f\u5149\u53cd\u5c04\u7684\u7ed3\u679c
B\uff0e\u5c0f\u5b54\u6210\u50cf\u662f\u5149\u76f4\u7ebf\u4f20\u64ad\u7684\u7ed3\u679c
C\uff0e\u7535\u5f71\u5c4f\u5e55\u4e0a\u53d1\u751f\u7684\u53cd\u5c04\u73b0\u8c61\u662f\u955c\u9762\u53cd\u5c04
D\uff0e\u770b\u5230\u6c34\u4e2d\u7684\u7b77\u5b50\u201c\u5f2f\u6298\u201d\u662f\u5149\u53cd\u5c04\u7684\u7ed3\u679c
3\uff0e \u56fe1\u6240\u793a\u7684\u51e0\u79cd\u5bb6\u7528\u7535\u5668\u6b63\u5e38\u5de5\u4f5c\u65f6\uff0c\u5c06\u7535\u80fd\u4e3b\u8981\u8f6c\u5316\u4e3a\u5185\u80fd\u7684\u662f
4\uff0e\u4e0b\u5217\u5173\u4e8e\u58f0\u73b0\u8c61\u7684\u8bf4\u6cd5\u4e2d\uff0c\u6b63\u786e\u7684\u662f
A.\u58f0\u97f3\u53ef\u4ee5\u5728\u771f\u7a7a\u4e2d\u4f20\u64ad B.\u58f0\u97f3\u53ef\u4ee5\u5728\u7a7a\u6c14\u4e2d\u4f20\u64ad
C.\u58f0\u97f3\u901f\u5ea6\u6bd4\u7535\u78c1\u6ce2\u901f\u5feb D.\u58f0\u97f3\u5728\u5404\u79cd\u4ecb\u8d28\u4e2d\u7684\u901f\u5ea6\u76f8\u540c
5\uff0e\u51ac\u5929\u5728\u6237\u5916\u8fd0\u52a8\u65f6\uff0c\u4eba\u547c\u51fa\u7684\u201c\u767d\u6c14\u201d\u662f
A. \u4eba\u547c\u51fa\u7684\u6c34\u84b8\u6c14 B. \u4eba\u547c\u51fa\u7684\u4e8c\u6c27\u5316\u78b3\u6c14\u4f53
C. \u7a7a\u6c14\u4e2d\u7684\u6c34\u84b8\u6c14\u9047\u51b7\u6db2\u5316\u5f62\u6210\u7684\u5c0f\u6c34\u73e0
D. \u4eba\u547c\u51fa\u7684\u6c34\u84b8\u6c14\u9047\u51b7\u6db2\u5316\u5f62\u6210\u7684\u5c0f\u6c34\u73e0
6\uff0e\u5bb6\u7528\u7535\u5439\u98ce\u673a\u7531\u7535\u52a8\u673a\u548c\u7535\u70ed\u4e1d\u7b49\u7ec4\u6210,\u4e3a\u4e86\u4fdd\u8bc1\u7535\u5439\u98ce\u673a\u7684\u5b89\u5168\u4f7f\u7528\uff0c\u8981\u6c42\u7535\u52a8\u673a\u4e0d\u5de5\u4f5c\u65f6\uff0c\u7535\u70ed\u4e1d\u4e0d\u80fd\u53d1\u70ed\u3002\u7535\u70ed\u4e1d\u4e0d\u53d1\u70ed\u65f6\uff0c\u7535\u52a8\u673a\u4ecd\u80fd\u5de5\u4f5c\u3002\u56fe2\u7535\u8def\u4e2d\u7b26\u5408\u8981\u6c42\u7684\u662f
\u56fe2
7\uff0e\u67d0\u5e7b\u706f\u673a\u7684\u955c\u5934\u548c\u5e7b\u706f\u7247\u4e4b\u95f4\u7684\u8ddd\u79bb\u53ef\u572810cm--20cm\u4e4b\u95f4\u8c03\u8282\u3002\u8fd9\u53f0\u5e7b\u706f\u673a\u662f\u7528\u4e0b\u5217\u54ea\u4e00\u4e2a\u900f\u955c\u505a\u955c\u5934
A. \u7126\u8ddd\u4e3a5cm\u7684\u51f8\u900f\u955c B. \u7126\u8ddd\u4e3a10cm\u7684\u51f9\u900f\u955c
C. \u7126\u8ddd\u4e3a10cm\u7684\u51f8\u900f\u955c D. \u7126\u8ddd\u4e3a20cm\u7684\u51f8\u900f\u955c
8\uff0e\u56fe3\u6240\u793a\u4e3a\u6c7d\u6cb9\u673a\u5de5\u4f5c\u8fc7\u7a0b\u4e2d\u7684\u4e00\u4e2a\u51b2\u7a0b\uff0c\u5219
A\uff0e\u662f\u538b\u7f29\u51b2\u7a0b\uff0c\u673a\u68b0\u80fd\u8f6c\u5316\u4e3a\u5185\u80fd
B\uff0e\u662f\u538b\u7f29\u51b2\u7a0b\uff0c\u5185\u80fd\u8f6c\u5316\u4e3a\u673a\u68b0\u80fd
C\uff0e\u662f\u505a\u529f\u51b2\u7a0b\uff0c\u673a\u68b0\u80fd\u8f6c\u5316\u4e3a\u5185\u80fd
D\uff0e\u662f\u505a\u529f\u51b2\u7a0b\uff0c\u5185\u80fd\u8f6c\u5316\u4e3a\u673a\u68b0\u80fd
9\uff0e \u5173\u4e8e\u5206\u5b50\u52a8\u7406\u8bba\u548c\u7269\u4f53\u5185\u80fd\u53d8\u5316\u7684\u8bf4\u6cd5\uff0c\u6b63\u786e\u7684\u662f
A\uff0e\u5728\u82b1\u4e1b\u65c1\u95fb\u5230\u6d53\u90c1\u7684\u82b1\u9999\u5c5e\u4e8e\u6269\u6563\u73b0\u8c61 \u56fe3
B\uff0e\u56fa\u4f53\u5f88\u96be\u88ab\u538b\u7f29\uff0c\u662f\u56e0\u4e3a\u56fa\u4f53\u5206\u5b50\u95f4\u6709\u5f88\u5927\u5f15\u529b\u7684\u7f18\u6545
C\uff0e\u94bb\u6728\u53d6\u706b\u662f\u901a\u8fc7\u70ed\u4f20\u9012\u7684\u65b9\u6cd5\u6539\u53d8\u7269\u4f53\u5185\u80fd\u7684
D\uff0e\u6c99\u6f20\u5730\u533a\u7684\u6c14\u6e29\u6bd4\u6cbf\u6d77\u5730\u533a\u53d8\u5316\u660e\u663e\u662f\u56e0\u4e3a\u6c99\u77f3\u7684\u6bd4\u70ed\u5bb9\u6bd4\u8f83\u5927
10\uff0e\u5982\u56fe4\u6240\u793a\u7535\u8def\uff0c\u7535\u6e90\u4e24\u7aef\u7535\u538b\u4e0d\u53d8\uff0cR\u4e3a\u5b9a
\u503c\u7535\u963b\u3002\u5f00\u5173S\u95ed\u5408\u540e\uff0c\u5728\u6ed1\u52a8\u53d8\u963b\u5668\u7684\u6ed1\u7247P\u7531
A\u5411B\u79fb\u52a8\u7684\u8fc7\u7a0b\u4e2d\uff0c\u4e0b\u5217\u5224\u65ad\u6b63\u786e\u7684\u662f
A\uff0e\u7535\u6d41\u8868\u7684\u793a\u6570\u53d8\u5c0f
B\uff0e\u7535\u538b\u8868V1\u7684\u793a\u6570\u53d8\u5c0f
C\uff0e\u7535\u538b\u8868V2\u7684\u793a\u6570\u53d8\u5c0f
D\uff0e\u7535\u538b\u8868V2\u793a\u6570\u4e0e\u7535\u6d41\u8868\u793a\u6570\u7684\u6bd4\u503c\u53d8\u5927
11\uff0e\u5c06\u706fL1\u63a5\u572812V\u7684\u7535\u8def\u4e2d\uff0c\u529f\u7387\u4e3a12W\u3002\u82e5\u4fdd\u6301\u7535\u8def\u4e24\u7aef\u7535\u538b\u4e0d\u53d8\uff0c\u5728\u7535\u8def\u4e2d\u518d\u8fde\u5165\u706fL2\uff0c\u4f7f\u7535\u8def\u7684\u603b\u529f\u7387\u4e3a4W\u3002\u82e5\u4e0d\u8003\u8651\u6e29\u5ea6\u5bf9\u706f\u4e1d\u7535\u963b\u7684\u5f71\u54cd,\u56fe5\u6240\u793a\u7684\u7535\u8def\u4e2d\uff0c\u8fde\u63a5\u65b9\u6cd5\u6b63\u786e\u7684\u662f
A B C D
12\uff0e\u5982\u56fe6\u6240\u793a\uff0c\u4e24\u4e2a\u7528\u540c\u79cd\u6750\u6599\u5236\u6210\u7684\u5706\u67f1\u4f53a\u548cb\uff0cb\u7684\u6a2a\u622a\u9762\u79ef\u662fa\u76843\u500d\uff0c\u5c06a\u7ad6\u76f4\u653e\u5728\u6c34\u5e73\u5730\u9762\u4e0a\uff0cb\u7ad6\u76f4\u653e\u5728a\u4e0a\uff0c\u5982\u56fe\u7532\u6240\u793a\uff0c\u8fd9\u65f6a\u5bf9\u5730\u9762\u7684\u538b\u5f3a\u4e0eb\u5bf9a\u7684\u538b\u5f3a\u4e4b\u6bd4\u4e3a3\u22362\uff1b\u82e5a\u3001b\u5012\u7f6e\u540e\u4ecd\u653e\u5728\u6c34\u5e73\u5730\u9762\u4e0a\uff0c\u5982\u56fe6\u4e59\u6240\u793a\uff0c\u5219a\u5bf9b\u7684\u538b\u5f3a\u4e0eb\u5bf9\u6c34\u5e73\u5730\u9762\u7684\u538b\u5f3a\u4e4b\u6bd4\u662f
A\uff0e1\u22361 B\uff0e1\u22362 C\uff0e1\u22363 D\uff0e1\u22364 \u56fe6
\u4e8c\u3001\u4e0b\u5217\u5404\u5c0f\u9898\u5747\u6709\u56db\u4e2a\u9009\u9879\uff0c\u5176\u4e2d\u81f3\u5c11\u6709\u4e24\u4e2a\u7b26\u5408\u9898\u610f\u3002\uff08\u517112\u5206\uff0c\u6bcf\u5c0f\u98983\u5206\u3002\u9519\u9009\u3001\u591a\u9009\u4e0d\u5f97\u5206\uff0c\u9009\u4e0d\u5168\u7684\u5f972\u5206\uff09
13\uff0e \u5bf9\u78c1\u573a\u548c\u78c1\u611f\u7ebf\uff0c\u4e0b\u5217\u8bf4\u6cd5\u6b63\u786e\u7684\u662f
A\uff0e\u78c1\u611f\u7ebf\u662f\u78c1\u573a\u4e2d\u5b9e\u9645\u5b58\u5728\u7684\u66f2\u7ebf
B\uff0e\u6307\u5357\u9488\u80fd\u591f\u6307\u5357\u5317\uff0c\u662f\u56e0\u4e3a\u53d7\u5230\u5730\u78c1\u573a\u4f5c\u7528
C\uff0e\u53ea\u8981\u5bfc\u4f53\u505a\u5207\u5272\u78c1\u611f\u7ebf\u8fd0\u52a8\uff0c\u5bfc\u4f53\u4e2d\u5c31\u4f1a\u4ea7\u751f\u611f\u5e94\u7535\u6d41
D\uff0e\u78c1\u573a\u7684\u57fa\u672c\u6027\u8d28\u662f\u5b83\u5bf9\u653e\u5165\u5176\u4e2d\u7684\u78c1\u4f53\u6709\u78c1\u529b\u7684\u4f5c\u7528
14\uff0e\u6f5c\u6c34\u8247\u5728\u6d77\u9762\u4e0b\u822a\u884c\u65f6\u6392\u5f00\u6c34\u7684\u8d28\u91cf\u4e3a \uff0c\u5728\u6d77\u9762\u4e0a\u822a\u884c\u65f6\u6392\u6c34\u7684\u8d28\u91cf\u4e3a \uff0c\u8bbe\u6d77\u6c34\u7684\u5bc6\u5ea6\u4e3a \uff0c\u4e0b\u5217\u8bf4\u6cd5\u4e2d\u6b63\u786e\u7684\u662f
A\uff0e\u5b83\u5728\u6d77\u9762\u4e0b\u822a\u884c\u65f6\u6240\u53d7\u6d6e\u529b\u7b49\u4e8e
B\uff0e\u5b83\u5728\u6d77\u9762\u4e0b\u822a\u884c\u65f6\u6240\u53d7\u7684\u538b\u529b\u5dee
C\uff0e\u5f53\u6f5c\u8247\u5728\u6d77\u9762\u4e0a\u822a\u884c\u65f6\uff0c\u6c34\u4e2d\u90e8\u5206\u7684\u4f53\u79ef\u4e3a
D\uff0e\u8981\u4f7f\u6f5c\u8247\u6f5c\u5165\u6d77\u9762\u4e0b\u8981\u5145\u5165\u91cd\u4e3a \u7684\u6d77\u6c34
15\uff0e\u5173\u4e8e\u56fe7\u6240\u793a\u7684\u56fe\u8c61\uff0c\u8bf4\u6cd5\u4e2d\u4e0d\u6b63\u786e\u7684\u662f
A\uff0e\u56fe\u7532\u8868\u660e\u540c\u79cd\u7269\u8d28\u7684\u5bc6\u5ea6\u4e0e\u8d28\u91cf\u6210\u6b63\u6bd4\uff0c\u4e0e\u4f53\u79ef\u6210\u53cd\u6bd4
B\uff0e\u56fe\u4e59\u8868\u660e\u7269\u4f53\u5728AB\u548cBC\u6bb5\u505a\u4e0d\u540c\u7684\u5300\u901f\u76f4\u7ebf\u8fd0\u52a8
C\uff0e\u56fe\u4e19\u8868\u660e\u6676\u4f53\u7194\u5316\u65f6\u6709\u7194\u70b9
D.\u56fe\u4e01\u8868\u793a\u4e00\u6bb5\u954d\u94ec\u5408\u91d1\u7ebf\u7684\u7535\u963b\u503c\u968f\u6e29\u5ea6\u53d1\u751f\u53d8\u5316
16\uff0e\u5982\u56fe8\u6240\u793a\uff0c\u7535\u6e90\u7535\u538b\u4e3a12V\u4e14\u4fdd\u6301\u4e0d\u53d8\uff0c\u5c0f\u706f\u6ce1L\u7684\u89c4\u683c\u4e3a\u201c6V 3W\u201d\uff0c\u6ed1\u52a8\u53d8\u963b\u5668\u7684\u6700\u5927\u963b\u503c\u4e3a12\u03a9\uff0c\u7535\u6d41\u8868\u7684\u91cf\u7a0b\u4e3a0\uff5e3A\u3002\u5f53\u5f00\u5173S1\u3001S2\u90fd\u65ad\u5f00\u65f6\uff0c\u5c0f\u706f\u6ce1L\u6070\u80fd\u6b63\u5e38\u53d1\u5149\uff0c\u5219\u4e0b\u5217\u8bf4\u6cd5\u6b63\u786e\u7684\u662f
A\uff0eR1\u7684\u963b\u503c\u4e3a24\u03a9
B\uff0e\u5f53\u5f00\u5173S1\u3001S2\u90fd\u65ad\u5f00\u65f6\uff0c\u572810min\u5185\u7535\u6d41\u901a\u8fc7R1\u6240 \u4ea7
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A B C D
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\u5c0f\u6587\u62c9\u7ef3\u7684\u529f\u7387P\u3002 \u56fe24
35\uff0e\u5982\u56fe25\u6240\u793a\u7535\u8def\uff0c\u7535\u6e90\u4e24\u7aef\u7535\u538b\u4fdd\u6301\u4e0d\u53d8\u3002\u5f53\u5f00\u5173S1\u95ed\u5408\u3001S2\u65ad\u5f00\uff0c\u6ed1\u52a8\u53d8\u963b\u5668\u7684\u6ed1\u7247P\u79fb\u5230A\u7aef\u65f6\uff0cR3\u7684\u7535\u529f\u7387\u4e3aP3\uff0c\u7535\u6d41\u8868\u7684\u793a\u6570\u4e3aI1\uff1b\u5f53\u5f00\u5173S1\u65ad\u5f00\u3001S2\u95ed\u5408\u65f6\uff0cR3\u7684\u7535\u529f\u7387\u4e3aP3\u2019\uff0c\u7535\u6d41\u8868\u7684\u793a\u6570\u4e3aI2\u3002\u5df2\u77e5P3:P3\u2019 = 9:25\uff0c
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\u5d07\u6587\u533a2008-2009\u5b66\u5e74\u5ea6\u521d\u4e09\u7b2c\u4e8c\u5b66\u671f\u7b2c\u4e00\u6b21\u7edf\u4e00\u7ec3\u4e60
\u7269\u7406\u8bd5\u9898\u53c2\u8003\u7b54\u6848\u53ca\u8bc4\u5206\u6807\u51c6 2009.5
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\u9898\u53f7 1 2 3 4 5 6 7 8 9 10 11 12
\u7b54\u6848 A B C B D D C D A B D A
\u4e8c\u3001\u591a\u9009\u9898\uff08\u517112\u5206\uff0c\u6bcf\u5c0f\u98983\u5206\uff09
\u9898 \u53f7 13 14 15 16
\u7b54 \u6848 BD CD AB BCD
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\u9898 \u53f7 \u7b54 \u6848 \u9898\u53f7 \u7b54 \u6848
17 \u653e\u51fa 21 \u8d39\u529b
18 2\u00d7104 22 8
19 \u53d8\u5c0f 23
20 150
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\u9898 \u53f7 \u7b54 \u6848 \u5206 \u6570 \u8bf4 \u660e
24 C 2\u5206
25 3.8 29 60 931.6 4\u5206 \u6bcf\u7a7a1\u5206
26
3\u5206 \u6bcf\u56fe1\u5206
27 \u653e\u5927 \u5012\u7acb 2\u5206 \u6bcf\u7a7a1\u5206
28 \u7535\u6d41(\u6216\u901a\u7535\u5bfc\u7ebf) a 2\u5206 \u6bcf\u7a7a1\u5206
29 (1)4 (2)\u6c14\u538b\u4f4e\u4e8e\u4e00\u6807\u51c6\u5927\u6c14\u538b (3)\u6c34\u5c11\u521d\u6e29\u9ad8\u706b\u7130\u5927 3\u5206 \u6bcf\u7a7a1\u5206
30 \u246062.5\uff05
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\u2462\u52a8\u6ed1\u8f6e\u4e2a\u6570(\u6216\u8d28\u91cf\u6216\u52a8\u6ed1\u8f6e\u91cd)
\u2463
6\u5206 \u6bcf\u7a7a1\u5206
31 (1) \u4e19
(2) Rx\u65ad\u8def
(3) 4.5 0.3 15
(4) A B 7\u5206 \u6bcf\u7a7a1\u5206
32
\uff081\uff09\u4f53\u79ef\u76f8\u540c\u7684\u94dc\u5757\u548c\u94c1\u5757\uff081\u5206\uff09
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33 Q\u5438\uff1dC\u6c34m(t-t0)
t0\uff1d =55\u2103- )
\uff1d25\u2103 1\u5206
1\u5206
1\u5206 \u7528\u5176\u5b83\u65b9\u6cd5\u89e3\u9898\uff0c\u8fc7\u7a0b\u7ed3\u8bba\u6b63\u786e\u7ed9\u5206\u3002
34 \u89e3\uff1a
(1) F\u652f=F\u538b=P\u4ebaS\u4eba
=8.75\u00d7103 Pa\u00d7400\u00d710-4 m2=350N
(2) F\u62c9=G\u4eba\uff0dF\u652f=600N-350N=250N
F\u6d6e=\u03c1\u6c34gVA
=1\u00d7103 kg/m3\u00d710N/ kg \u00d70.0 1 m3=100N
GA+G\u52a8=2F\u62c9+F\u6d6e=2\u00d7250N+100N=600N
GA+G\u52a8=600N \u2460
B\u5728\u7a7a\u6c14\u4e2d:\u03b7B= =80% \u2461
GA\uff1aGB=5\uff1a12 \u2462
\u7531\u2460\u2461\u2462\u5f0f\u53ef\u5f97
GA=375N G\u52a8 =225 N
\u03c1A=
=3.75\u00d7103 kg/m3
(3) A\u5728\u6c34\u4e2d
\u03b7A= = =55%
\uff084\uff09P=F\u2019\u62c9 �6�1 v\u62c9= \u00d7 2 v\u7269
= \u00d72\u00d7 0.2m/s = 120W
则V铁=5dm^3*30%
=1.5dm^3
=0.0015m^3
则m铁=0.0015m^3*7.8*10^3kg/m^3
=11.7kg
V铅=5dm^3*（1-30%）
=3.5dm^3
=0.0035m^3
m铅=0.0035m^3*11.3*10^3kg/m^3
=39.56kg
m总=11.7kg+39.56kg
=51.25kg
ρ=51.25kg/0.005m^3
=10.25*10^3kg/m^3
答：这个金属球的密度是10.25*10^3kg/m^3
2。解：（1）由题意可知
V水=V酒精
设空瓶质量为m瓶
则(320g-m)/1g/cm^3=(280g-m)/0.8g/cm^3
320g-m=350g-1.25m
0.25m=30g
m=120g
（2）瓶子的容积 V=(280g-120g)/0.8g/cm^3
V=200cm^3
答：空瓶的质量是120g，瓶的容积是200cm^3.
3.解：（1）此时盐水的体积是0.0005m^3
ρ盐水=0.6kg/0.0005m^3
=1.2*10^3kg/m^3＞1.1*10^3kg/m^3
不符合要求。
（2)应加水 设加水mkg
(0.6kg+m)/(0.0005+m/1.0*10^3/m^3)=1.1*10^3kg/m^3
0.6kg+m=0.5*1.1+1.1m
0.1m=0.05
10m=5
m=0.5kg
答：应加水0.5kg。
（4）解:设金的体积为V
19.3g/cm^3V+8.9g/cm^3（1.8cm^3-V）=17.06g
10.4V=1.04
V=0.1cm^3
m金=1.93g，m铜=(1.8cm^3-0.1cm^3)*8.9g/cm^3
=15.13g
答：金的质量是1.93g，铜的质量是15.13g。
这是我的回答希望能得到你的肯定。。
绛旓細3.涓嶅悓鐗╄川锛寁1:v2=蟻2:蟻1(瀵嗗害鐨勫弽姣)鏍规嵁m=蟻V銆鐗╃悊鍏跺疄涓嶉毦锛屾垜鏄珮浜岀悊绉戠敓锛屼互鍓嶇墿鐞嗛兘鏄嚧鍛界锛屽悗鏉ユ壘鍒颁簡璇绐嶏紝鎴愮哗灏变笂鏉ヤ簡銆傜墿鐞嗙殑鏍稿績鍐呭灏辨槸鍏紡锛屼竾鍙樹笉绂诲叾瀹椼傛墍鏈鐨勯閮芥槸閭ｄ竴涓叡寮忕殑鍙樺舰銆傚厖鍒嗙悊瑙ｅ叕寮忥紝鍋氶灏卞熀鏈病鏈夐毦搴︿簡銆傝鐪熷惉璁叉槸鏍规湰锛屽鍋氶锛屾瘡閬撻閮借鍚冮...
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1.V(閾)=m(閾)/蟻(閾)=3.12kg/7.8*10^3kg/m^3=4*10^-4(m^3)=0.4(dm^3)V绌=V-V(閾)=0.9-0.4=0.5(dm^3)m(姘)=蟻(姘)*V绌=1kg/dm^3*0.5=0.5kg m鎬=m姘+m閾=0.5+3.12=3.65kg 2.璁鹃摐鐨勪綋绉负x(cm^3)8.9*x+2.7*(20-x)=116 鎵浠=10(cm^3...
绛旓細1銆併2009•鐜夋灄甯傘戣档鍐涘悓瀛﹀湪瀹堕噷鎯崇煡閬撴煇绉嶉鐢ㄦ补鐨瀵嗗害锛屼簬鏄粬鍒╃敤瀛﹁繃鐨勭墿鐞鐭ヨ瘑璁捐浜嗕竴绉嶆眰椋熺敤娌瑰瘑搴︾殑鏂规硶銆備粬鎵炬潵涓鏀洿寰勫潎鍖銆佷竴绔皝闂殑鐜荤拑绠★紝寰鐜荤拑绠￠噷鏀句汉閫傞噺鐨勯搧鐮傦紝绠″彛鏈濅笂鏀惧叆姘撮噷锛岀幓鐠冪绔栫洿娴湪姘翠腑锛岄潤姝㈠悗娴嬪嚭鐜荤拑绠￠湶鍑烘按闈㈢殑闀垮害涓烘婚暱搴︾殑 锛涘啀鎶婄幓鐠冪鏀句汉寰...
绛旓細1锛岋紙1锛夌敤澶╁钩娴嬭川閲弇锛涳紙2锛夌敤閲忕瓛娴嬩綋绉疺 2锛 A; 3姝ラ锛 鍋忓ぇ 3锛 锛1锛堿D锛涳紙2锛 CBEF 4锛岋紙1锛18锛2.7锛岋紙2锛夊厛娴嬭川閲忥紝锛堝洜涓哄厛娴嬩綋绉殑璇濇湁姘村湪鐭冲潡琛ㄩ潰锛屽澶ц川閲忥級銆傦紙3锛変娇璇绘暟鏇寸簿纭
绛旓細1)V鐡=V姘=500g/(1g/cm)=500cm3 p娑=400g/500cm3=0.8g/cm3 2)p娌=24.6g/30cm3=0.82g/cm3 m娌=30m3脳(820kg/m3)=24600kg
绛旓細姹傦細鈻砿 瑙ｏ細閾滈浂浠剁殑浣撶Н涓篤=m/蟻閾=4.45/8.9=0.5dm^3 鍒欐敼涓虹敤閾濆埗閫犱竴涓畬鍏ㄧ浉鍚岀殑闆朵欢锛岃川閲忓彲浠ュ噺灏戯細鈻砿=(蟻閾-蟻閾)V=(8.9-2.7)*0.5=3.1kg 2.宸茬煡:m0=140g,V1=100ml,V2=150ml 姹:M 瑙ｏ細灏忕煶鍧楃殑浣撶Н涓猴細V0=150-100=50cm^3 鐭冲潡鐨瀵嗗害涓猴細蟻=m0/V0=140/50...
绛旓細(1)40N鍗4kg,500cm3鐨勪綋绉,鐢变簬绾搮瀵嗗害=11.3g/cm3.鑻ユ槸绾搮鍋氱殑,鍒欏叾璐ㄩ噺搴旇涓500*11.3=5650g>4000g 鎵浠ヤ笉鏄函閾呭仛鐨.(2)鍥犱负鏈ㄥご瀵嗗害涓哄瘑搴700kg/m3,鏈ㄦā璐ㄩ噺鏄5.6kg,鎵浠ユ湪妯′綋绉负 5.6/700=0.8*10^-2m^3 鐢变簬閾鐨勫瘑搴鏄7.9*10^3kg/m^3(浣嗘槸鎴 璁板緱鏄7.8*10^3/m^...
绛旓細1.(15*24)/(200-80)=3 2.閾佺殑瀵嗗害锛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锛堟按绋鐨勫瘑搴锛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4. 浣撶Н鏄30cm3鐨勯摑鐞冿紝璐ㄩ噺鏄27g锛岃繖涓摑鐞冩槸绌哄績鐨勮繕鏄疄蹇冪殑?绛旀锛1锛庢瘡鑺傛补缃愯溅鐨勫绉负50m3锛屼粠娌圭綈涓彇鍑20cm3鐨勬补锛岃川閲忎负17鍏嬶紝涓婊＄綈鐨勬补鐨勮川閲忔槸澶氬皯鍚?p=m/v m=17g=0.017kg,v=20cm^3=20*10^(-6)m^3 閭ｄ箞娌圭殑瀵嗗害鏄痯=0.017/[20*10^(-6)]=0.85*10^3kg/m^3 ...
