初中物理计算题
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\u2460\u7535\u68af\u5728\u5300\u901f\u8fd0\u52a8\u9636\u6bb5\u4e0a\u5347\u7684\u9ad8\u5ea6h1\u662f\u591a\u5c11?\u62c9\u529bF1\u505a\u4e86\u591a\u5c11\u529f?
\u2461\u7535\u68af\u5728\u52a0\u901f\u9636\u6bb5\u7684\u5e73\u5747\u901f\u5ea6\u7b49\u4e8e\u8be5\u9636\u6bb5\u901f\u5ea6\u7684\u6700\u5927\u503c\u548c\u6700\u5c0f\u503c\u7684\u5e73\u5747\u503c\u3002\u5df2\u77e5\u5728\u52a0\u901f\u9636\u6bb5\uff0c\u7535\u52a8\u673a\u7684\u62c9\u529bF2\u505a\u4e8611520J\u7684\u529f\uff1b\u6c42\u52a0\u901f\u9636\u6bb5\u7535\u52a8\u673a\u62c9\u529bF2\u7684\u5927\u5c0f?
\u2462\u7535\u68af\u5f00\u59cb\u5411\u4e0a\u8fd0\u52a8\u540e\u7ecf\u8fc764s\uff0c\u7535\u52a8\u673a\u7684\u62c9\u529b\u7684\u5e73\u5747\u529f\u7387\u662f\u591a\u5927?
\u4f8b6\uff0e\u7535\u52a8\u81ea\u884c\u8f66\u8d8a\u6765\u8d8a\u53d7\u5230\u4eba\u4eec\u7684\u9752\u7750\uff0c\u4e0d\u5c11\u4eba\u7528\u7535\u52a8\u81ea\u884c\u8f66\u66ff\u4ee3\u4e86\u6469\u6258\u8f66\u3002\u7535\u52a8\u81ea\u884c\u8f66\u4f7f\u7528\u524d\u8981\u5148\u5bf9\u8f66\u4e0a\u7684\u84c4\u7535\u6c60\u5145\u7535\uff0c\u9a91\u884c\u65f6\uff0c\u84c4\u7535\u6c60\u5bf9\u8f66\u4e0a\u7684\u7535\u52a8\u8f66\u4f9b\u7535\uff0c\u7535\u52a8\u673a\u4e3a\u8f66\u63d0\u4f9b\u52a8\u529b\u3002\u4e0b\u8868\u662f\u67d0\u54c1\u724c\u7535\u52a8\u81ea\u884c\u8f66\u7684\u4e00\u4e9b\u4e3b\u8981\u6280\u672f\u53c2\u6570\uff1a
\u6700\u9ad8\u8f66\u901f \u226430km/h \u4e00\u6b21\u5145\u7535\u8fde\u7eed\u884c\u9a76\u91cc\u7a0b 50km
\u84c4\u7535\u6c60\u5de5\u4f5c\u7535\u538b 36V \u5145\u7535\u65f6\u95f4 8h
\u4e00\u6b21\u5145\u7535\u8017\u7535\u91cf 0.6kwh \u7535\u52a8\u673a\u6548\u7387 75\uff05
\u8d28\u91cf 40kg \u6700\u5927\u9a91\u884c\u566a\u58f0 \u226462dB
\u82e5\u8d28\u91cf\u662f60kg\u7684\u4eba\u9a91\u7535\u52a8\u81ea\u884c\u8f66\u5728\u6c34\u5e73\u8def\u9762\u4e0a\u4ee56m/s\u7684\u901f\u5ea6\u5300\u901f\u884c\u9a76\u65f6\uff0c\u53d7\u5230\u7684\u963b\u529b\u662f\u4eba\u4e0e\u8f66\u603b\u91cd\u76840.02\u500d\uff0c\u53d6g=10N/kg\uff0c\u6c42\uff1a\uff081\uff09\u884c\u9a7610\u5206\u949f\uff0c\u7535\u52a8\u673a\u5bf9\u81ea\u884c\u8f66\u505a\u7684\u529f\u3002\uff082\uff09\u901a\u8fc7\u7535\u52a8\u673a\u7ebf\u5708\u7684\u7535\u6d41\u3002\uff083\uff09\u82e5\u6469\u6258\u8f66\u767e\u516c\u91cc\u8017\u6cb92.5L\uff0c\u6bcf\u5347\u6cb94.65\u5143\uff0c\u7167\u660e\u7528\u7535\u6bcf\u5ea60.52\u5143\uff0c\u8bd5\u6bd4\u8f83\u8bf4\u660e\u4f7f\u7528\u7535\u52a8\u81ea\u884c\u8f66\u4e0e\u6469\u6258\u8f66\u54ea\u79cd\u66f4\u7ecf\u6d4e\u3002
\u4f8b7\uff0e\u636e\u300a\u5a01\u6d77\u665a\u62a5\u300b5\u670823\u65e5\u62a5\u9053\uff1a\u8bb0\u8005\u5728\u8363\u6210\u6e2f\u897f\u9547\u6d77\u8fb9\u7684\u98ce\u529b\u53d1\u7535\u9879\u76ee\u65bd\u5de5\u73b0\u573a
\u4e86\u89e3\u5230\uff0c\u843d\u6237\u6211\u5e02\u7684\u5927\u578b\u98ce\u529b\u53d1\u7535\u9879\u76ee\u4e00\u671f\u5de5\u7a0b9\u6708\u5e95\u53ef\u5168\u9762\u6295\u4ea7\u53d1\u7535\u3002\u5c4a\u65f6\uff0c\u6211\u5e02\u5317\u90e8
\u6cbf\u6d77\u5c06\u8038\u8d77\u4e00\u7247\u201c\u98ce\u7535\u6797\u201d(\u5982\u56fe\u6240\u793a)\uff0c\u4e3a\u5a01\u6d77\u7ecf\u6d4e\u53d1\u5c55\u63d0\u4f9b\u53ef\u518d\u751f\u7eff\u8272\u80fd\u6e90\uff0c\u540c\u65f6\u4e3a\u65c5\u6e38\u4e1a\u5e26\u6765\u65b0\u4eae\u70b9\u3002\u8fd9\u9879\u603b\u6295\u8d4412\u4ebf\u5143\uff0c\u53d1\u7535\u5bb9\u91cf\u4e3a15\u4e07\u5343\u74e6\u7684\u534e\u80fd\u4e2d\u7535\u5a01\u6d77\u98ce\u529b\u53d1\u7535\u9879\u76ee\uff0c\u4f4d\u4e8e\u8363\u6210\u671d\u9633\u6e2f\u5927\u6865\u4ee5\u897f\u81f3\u5d2e\u5c71\u9547\u6cbf\u73af\u6d77\u8def\u3002\u6c42\uff1a
(1)\u5373\u5c06\u5e76\u7f51\u768415\u4e07\u5343\u74e6\u98ce\u529b\u53d1\u7535\u673a\u7ec4\uff0c\u9884\u8ba1\u5e74\u53d1\u7535\u91cf3x108kW\uff0eh\uff0c\u76f8\u5f53\u4e8e\u5b8c\u5168\u71c3\u70e7\u591a\u5c11\u5428\u7164\u653e\u51fa\u7684\u80fd\u91cf?(\u7164\u7684\u70ed\u503c\u4e3a3\uff0e0x107J\uff0fkg)
(2)\u82e5\u7535\u5382\u901a\u8fc7\u4f9b\u7535\u7cfb\u7edf\u7528220V\u7684\u7535\u538b\u7ed9\u5c0f\u521a\u5bb6\u6240\u5728\u7684\u79bb\u7535\u5382\u8f83\u8fdc\u7684\u5c0f\u533a\u4f9b\u7535\uff0c\u67d0\u5929\u5c0f\u521a\u53d1\u73b0\u81ea\u5bb6\u201c220V 100W\u201d\u7684\u767d\u70bd\u706f\u5de5\u4f5c484s\uff0c\u6d88\u8017\u7535\u80fd\u4e3a4x104J\u3002\u6c42\uff1a\u52a0\u5728\u5c0f\u521a\u5bb6\u7528\u7535\u5668\u4e24\u7aef\u7684\u5b9e\u9645\u7535\u538b\u662f\u591a\u5c11?
(3)\u5df2\u77e5\u5c0f\u521a\u5bb6\u8fdb\u6237\u7ebf\u4e0a\u88c5\u6709\u4e00\u7a7a\u6c14\u5f00\u5173\uff0c\u5f53\u7535\u6d41\u8fbe\u523020A\u65f6\uff0c\u7a7a\u6c14\u5f00\u5173\u5c06\u81ea\u52a8\u201c\u8df3
\u95f8\u201d\uff0c\u5219\u5c0f\u521a\u5bb6\u4f7f\u7528\u7684\u7528\u7535\u5668\u7684\u6700\u5927\u7535\u529f\u7387\u4e0d\u80fd\u8d85\u8fc7\u591a\u5c11?
\u4f8b8.\u67d0\u5bbe\u9986\u5bf9\u7269\u54c1\u8fdb\u884c\u6d88\u6bd2\u65f6\u4f7f\u7528\u9ad8\u6e29\u9ad8\u538b\u84b8\u6c7d\u6d88\u6bd2\u9505 (\u5982\u56fe\u7532). \u56fe\u4e59\u4e3a\u81ea\u52a8\u6d4b\u5b9a\u9505\u5185\u6e29\u5ea6\u7684\u7535\u8def\u539f\u7406\u56fe\uff0e\u5176\u4e2d R0\u4e3a\u5b9a\u503c\u7535\u963b\uff0c\u963b\u503c\u4e3a5\u03a9\uff0eA\u4e3a\u6e29\u5ea6\u6307\u793a\u8868(\u5b9e\u8d28\u662f\u4e00\u53ea\u91cf\u7a0b\u4e3a0~0.6A\u7684\u7535\u6d41\u8868) \uff0cRX\uff08\u6d4b\u6e29\u63a2\u5934\uff09\u4e3a\u70ed\u654f\u7535\u963b(\u5176\u7535\u963b\u503c\u968f\u9505\u5185\u6e29\u5ea6\u7684\u53d8\u5316\u800c\u53d8\u5316)\uff0e\u5173\u4e8e\u70ed\u654f\u7535\u963b\u7684\u963b\u503c\u4e0e\u6e29\u5ea6\u7684\u5bf9\u5e94\u5173\u7cfb\u5982\u4e0b\u8868\u6240\u793a\uff1a
\u9505\u5185\u7684\u6e29\u5ea6\u503c/oC 25 37.5 50 62.5 75 87.5 100 112.5 125
Rx\u5bf9\u5e94\u7684\u7535\u963b\u503c/\u03a9 150 80 50 30 20 15 10 7
(1)\u82e5\u9505\u5185\u6e29\u5ea6\u4e3a75 oC \u65f6\u7535\u6d41\u8868\u7684\u793a\u6570\u4e3a0.24A\uff0e\u6c42\u7535\u6e90\u7684\u7535\u538bU\uff0e
(2)\u82e5\u9505\u5185\u6e29\u5ea6\u4e3a125 oC \u65f6\u7535\u6d41\u8868\u7684\u793a\u6570\u4e3a0.6A\uff0e\u6c42\u6b64\u65f6\u70ed\u654f\u7535\u963bRX\u7684\u963b\u503c\u53ca\u5176\u529f\u7387\uff0e
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2\uff0e\u5f20\u534e\u5728\u5bb6\u770b\u5b8c\u7535\u89c6\u540e\uff0c\u4e60\u60ef\u628a\u9065\u63a7\u5668\u4e00\u6441\uff0c\u5c31\u7b97\u628a\u7535\u89c6\u5173\u4e86\u3002\u6709\u4e00\u6b21\u4ed6\u53d1\u73b0\u7535\u89c6\u673a\u4e0a\u8fd8\u6709\u4e00\u4e2a\u6307\u793a\u706f\u4eae\u7740\uff08\u5b9e\u9645\u4e0a\u6b64\u65f6\u7535\u89c6\u673a\u5904\u4e8e\u5f85\u673a\u72b6\u6001\uff09\u3002\u4e8e\u662f\u4ed6\u60f3\uff1a\u8fd9\u65f6\u7535\u89c6\u673a\u662f\u5426\u8fd8\u5728\u6d88\u8017\u7535\u80fd\u5462\uff1f\u4e00\u6b21\u7236\u6bcd\u8981\u5916\u51fa\u65c5\u6e38\uff0c\u4ed6\u5f81\u5f97\u7236\u6bcd\u540c\u610f\uff0c\u8bbe\u8ba1\u4e86\u5982\u4e0b\u65b9\u6848\u8fdb\u884c\u63a2\u7a76\uff1a\u8ba9\u7535\u89c6\u673a\u5904\u4e8e\u5f85\u673a\u72b6\u6001\uff0c\u7136\u540e\u62d4\u6389\u5176\u5b83\u6240\u6709\u7528\u7535\u5668\u7684\u7535\u6e90\u63d2\u5934\u6216\u5173\u6389\u5f00\u5173\uff0c\u8bb0\u4e0b\u65f6\u95f4\u548c\u5bb6\u4e2d\u7535\u80fd\u8868\u7684\u8bfb\u6570\uff1b\u53bb\u7237\u7237\u5bb6\u4f4f\u4e863\u5929\u540e\u56de\u5230\u5bb6\u4e2d\uff0c\u518d\u8bb0\u4e0b\u6b64\u65f6\u7684\u65f6\u95f4\u548c\u7535\u80fd\u8868\u7684\u8bfb\u6570\u3002\u8bb0\u5f55\u6570\u636e\u5982\u53f3\u8868\u3002\u95ee\uff1a\uff08l\uff09\u5f20\u534e\u5916\u51fa\u8fd9\u6bb5\u65f6\u95f4\u91cc\uff0c\u4ed6\u5bb6\u7684\u7535\u89c6\u673a\u6d88\u8017\u7684\u7535\u80fd\u662f\u591a\u5c11kw•h\uff1f\uff082\uff09\u5f20\u534e\u5bb6\u7535\u89c6\u673a\u5728\u5f85\u673a\u72b6\u6001\u4e0b\u6d88\u8017\u7684\u7535\u529f\u7387\u662f\u591a\u5c11W\uff1f\uff083\uff09\u6842\u6797\u5e02\u4eba\u53e3\u5171\u8ba1\u7ea6480\u4e07\uff0c\u4f30\u8ba1\u6709\u8fd160\u4e07\u53f0\u7535\u89c6\u673a\uff0c\u5047\u8bbe\u5e73\u5747\u6bcf\u53f0\u7535\u89c6\u673a\u6bcf\u5929\u5904\u4e8e\u5f85\u673a\u72b6\u600115h\uff0c\u5f85\u673a\u529f\u7387\u4e0e\u5f20\u534e\u5bb6\u7535\u89c6\u673a\u76f8\u540c\uff0c\u5219\u6bcf\u6708\uff08\u630930\u5929\u8ba1\uff09\u5171\u6d6a\u8d39\u7684\u7535\u80fd\u7ea6\u4e3a\u591a\u5c11kw•h\uff1f\uff084\uff09\u8981\u663e\u8457\u964d\u4f4e\u7535\u89c6\u673a\u8fd9\u79cd\u4e0d\u6b63\u5e38\u7684\u7535\u80fd\u6d88\u8017\uff0c\u4f60\u8ba4\u4e3a\u5e94\u8be5\u91c7\u53d6\u4ec0\u4e48\u63aa\u65bd\uff1f
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4\u3001\u5c0f\u521a\u5bb6\u65b0\u4e70\u4e86\u4e00\u4e2a\u7535\u7089\uff0c\u5b83\u7684\u989d\u5b9a\u7535\u538b\u662f220V\uff0c\u989d\u5b9a\u529f\u7387\u662f1000W\uff0c\u8ba9\u7535\u7089\u5728\u989d\u5b9a\u7535\u538b\u4e0b\u5de5\u4f5c\uff0c\u628a10kg\u7684\u6c34\u4ece20\u2103\u52a0\u70ed\u5230100\u2103\u3002[\u4e0d\u8ba1\u70ed\u635f\u5931]
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6.\u5c0f\u660e\u5bb6\u4e3a\u4e86\u6539\u5584\u5c45\u4f4f\u6761\u4ef6\uff0c\u8ba1\u5212\u5efa\u4e00\u5ea7\u623f\u5b50\uff0c\u5176\u8bbe\u8ba1\u7684\u623f\u5b50\u5256\u9762\u56fe\u5982\u56fe\u6240\u793a\u3002\u4ed6\u8bbe\u8ba1\u7684\u5730\u57fa\u548c\u623f\u4f53\u7684\u603b\u8d28\u91cf\u4e3a4\u00d7105kg\uff0c\u5730\u57fa\u603b\u7684\u5e95\u9762\u79ef\u4e3a32m2\u3002\uff08g\uff1d10N/kg\uff09\u6c42\uff1a\uff081\uff09\u5730\u57fa\u548c\u623f\u4f53\u7684\u603b\u91cd\u529b\u662f\u591a\u5c11\u725b\uff1f\uff082\uff09\u5730\u57fa\u548c\u623f\u4f53\u5bf9\u5730\u7684\u538b\u5f3a\u662f\u591a\u5c11Pa\uff1f
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8\uff0e\u738b\u78ca\u540c\u5b66\u5b66\u4e60\u4e86\u7535\u5b66\u77e5\u8bc6\u540e\uff0c\u5bf9\u5ba2\u5385\u91cc\u7684\u7167\u660e\u7535\u8def\u8fdb\u884c\u4e86\u6539\u88c5\uff0c\u5c06\u539f\u6765\u7531\u4e00\u53ea\u5f00\u5173\u63a7\u5236\u7684\u4e94\u4e2a\u706f\u6ce1\u7ec4\u6210\u7684\u7167\u660e\u7535\u8def\uff0c\u5206\u6210\u4e24\u7ec4\uff0c\u5206\u522b\u7531\u4e24\u53ea\u5f00\u5173\u63a7\u5236\uff0c\u9700\u8981\u8f83\u5f3a\u7684\u4eae\u5ea6\u65f6\u5168\u90e8\u706f\u6ce1\u90fd\u4eae\uff0c\u4e0d\u9700\u8981\u5f88\u4eae\u65f6\u53ea\u6709\u4e24\u4e2a\u706f\u6ce1\u4eae\uff0c\u767d\u5929\u6216\u5385\u5185\u65e0\u4eba\u65f6\u5219\u5168\u90e8\u5173\u95ed\u3002\u738b\u78ca\u540c\u5b66\u7ecf\u8fc7\u8f83\u957f\u65f6\u95f4\u7684\u7edf\u8ba1\uff0c\u5f97\u5230\u4e0b\u5217\u4e00\u7ec4\u6570\u636e\uff1a
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6h 2h 4h 60W
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9\u3001\u4e00\u4e2a\u4f53\u91cd\u4e3a500N\u7684\u540c\u5b66\u9a91\u81ea\u884c\u8f66\u4e0a\u5b66\uff0c\u5728\u6c34\u5e73\u8def\u9762\u4e0a\u4ee54m/s\u7684\u901f\u5ea6\u5300\u901f\u884c\u9a76. \u6709\u5173\u6570\u636e\u5982\u53f3\u8868\u6240\u793a.\uff081\uff09\u5728\u884c\u9a76\u8fc7\u7a0b\u4e2d\uff0c\u8f66\u5bf9\u5730\u9762\u7684\u538b\u5f3a\u662f\u591a\u5927\uff1f
\u81ea\u884c\u8f66\u51c0\u91cd 200N
\u884c\u9a76\u8fc7\u7a0b\u8f6e\u80ce\u4e0e\u5730\u9762\u63a5\u89e6\u603b\u9762\u79ef 1\u00d710\uff0d2m2
\u5300\u901f\u884c\u9a76\u8fc7\u7a0b\u4e2d\u7684\u603b\u963b\u529b 30N
\u8f66\u8f6e\u76f4\u5f84 0.61m
\u8f6e\u80ce\u627f\u53d7\u7684\u6700\u5927\u538b\u5f3a 1.2\u00d7105Pa
\uff082\uff09\u8be5\u540c\u5b66\u9a91\u8f66\u6cbf\u76f4\u7ebf\u5300\u901f\u884c\u9a7610min\u505a\u4e86\u591a\u5c11\u529f\uff1f
10\u3001\u8fd9\u7f13\u89e3\u7528\u7535\u9ad8\u5cf0\u7535\u529b\u7d27\u5f20\u7684\u77db\u76fe\uff0c\u964d\u4f4e\u5c45\u6c11\u7684\u7528\u7535\u8d39\u7528\uff0c\u6211\u5e02\u90e8\u5206\u5730\u533a\u5df2\u4f7f\u7528\u4e86\u5206\u65f6\u7535\uff08\u80fd\uff09\u8868\uff0c\u7535\u8d39\u4ef7\u76ee\u5982\u4e0b\u8868\uff1a
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8\uff1a00~21\uff1a00 21\uff1a00~\u6b21\u65e58\uff1a00
\u5355\u4ef7\uff08\u5143/\u5ea6\uff09 0.52 0.55 0.30
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11\uff0e\u4e00\u5efa\u7b51\u5de5\u4eba\u7528\u5982\u56fe\u6240\u793a\u7684\u6ed1\u8f6e\u7ec4\u63d0\u8d771200N\u7684\u88c5\u9970\u6750\u6599\uff0c\u6240\u7528\u7684\u62c9\u529b\u662f800N\uff0c\u7ef3\u5b50\u7684\u81ea\u7531\u7aef\u88ab\u62c9\u4e0b4m\uff0c\u6c42 (1)\u63d0\u8d77\u8d27\u7269\u6240\u505a\u7684\u6709\u7528\u529f\u3001\u603b\u529f? (2)\u6ed1\u8f6e\u7ec4\u7684\u673a\u68b0\u6548\u7387?
12\uff0e\u6842\u6797\u5e02\u533a\u201c\u4e24\u6c5f\u56db\u6e56\u201d\u73af\u57ce\u6c34\u7cfb\u7684\u5efa\u6210\uff0c\u9020\u5c31\u4e86\u6842\u6797\u201c\u5343\u5cf0\u73af\u91ce\u7acb\uff0c\u4e00\u6c34\u62b1\u57ce\u6d41\u201d\u7684\u5c71\u6c34\u57ce\u5e02\u683c\u5c40\u3002\u5e76\u4f7f\u5e02\u533a\u5185\u6e56\u6e56\u9762\u6269\u5927\u5230\u7ea64.0\u00d7105 m2\uff0c\u6c34\u91cf\u589e\u52a0\u5230\u7ea69. 5\u00d7105 m3\u3002\u95ee\uff1a
\uff081\uff09\u5728\u708e\u70ed\u7684\u76db\u590f\uff0c\u6e56\u6c34\u6e29\u5ea6\u6bcf\u5347\u9ad81\u2103\uff0c\u5c31\u53ef\u4ece\u5468\u56f4\u5e02\u533a\u5438\u6536\u591a\u5c11\u70ed\u91cf\uff1f\uff082\uff09\u201c\u4e24\u6c5f\u56db\u6e56\u201d\u73af\u57ce\u6c34\u7cfb\u7684\u5efa\u6210\uff0c\u5bf9\u57ce\u533a\u7684\u73af\u5883\u6709\u4ec0\u4e48\u597d\u5904\uff1f\uff08\u8981\u6c42\u5199\u51fa\u4e24\u70b9\uff09
13\uff0e\u8df3\u7ef3\u662f\u4e00\u9879\u5f88\u597d\u7684\u4f53\u80b2\u5065\u8eab\u6d3b\u52a8\uff0c\u7ecf\u6d4b\u8bd5\u91cd500N\u7684\u67d0\u540c\u5b661 min\u8df3\u7ef3120\u6b21\uff0c\u6bcf\u6b21\u79bb\u5730\u7ea60.06m(\u6bcf\u6b21\u79bb\u5730\u9ad8\u5ea6\u548c\u65f6\u95f4\u90fd\u76f8\u540c)\uff0e
(1)\u8be5\u540c\u5b66\u8df3\u4e00\u6b21\u505a\u529f\u591a\u5c11\u7126\u8033?(2)\u4ed6\u5728\u8fd91 min\u7684\u953b\u70bc\u4e2d\u6d88\u8017\u7684\u529f\u7387\u662f\u591a\u5927?
(3)\u8df3\u7ef3\u65f6\u5bf9\u5730\u9762\u7684\u538b\u5f3a\u4e0e\u7ad9\u7acb\u65f6\u76f8\u6bd4\u8f83\u6709\u4f55\u53d8\u5316?\u5e76\u8bf4\u660e\u5224\u65ad\u7684\u7406\u7531\uff0e
Q=cmΔt c=4.2×10³J/(kg·℃) m=50kg Δt=50℃-10℃=40℃
=4.2×10³J/(kg·℃)×50k ×40℃
=8.4×10六次方J
第二题
直接用第一题最后得到的热除以它吸收的热
8.4×10六次方J 除以 2.8×10七次方J= 1/3 ≈33.3%
第三题
根据Q=cmΔt 得出 m=Q/cΔt
Q为第一题放出的热量8.4×10六次方J
c煤=3.5×10七次方J(kg·℃)
Δt为第一题结果 为40℃
m=Q/cΔt
=8.4×10六次方J /[3.5×10七次方J(kg·℃) × 40℃]
=6×10负三次方kg
1.4200*50*(50-10)=8400000J
2.8400000/28000000=30%
3.28000000/35000000=0.8kg
1.Q=cm(t末-t初）=4200*50*(50-10)=8400000J
2.如：8400000/28000000=30%
3.28000000/35000000=0.8kg
忘记公式了 很简单 书上有公式 直接套公式
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