八年级下册物理 浮力和机械效率 的计算题 请给我20道浮力、压强、机械效率物理计算题的原题，以及正确的...

\u521d\u4e2d\u516b\u5e74\u7ea7\u7269\u7406\u6709\u5173\u6d6e\u529b\u538b\u5f3a\uff0c\u529f\u3001\u529f\u7387i\u673a\u68b0\u6548\u7387\u7684\u5178\u578b\u8ba1\u7b97\u9898\u5f52\u7eb3

(2010\uff0e\u6c5f\u897f)\u67d0\u5b66\u6821\u4e3a\u4e86\u7ed9\u84c4\u6c34\u5854\u62bd\u6c34\uff0c\u65b0\u4e70\u4e86\u4e00\u5355\u76f8\u87ba\u6746\u81ea\u5438\u6cf5\uff0c\u5176\u94ed\u724c\u4e0a\u7684\u90e8\u5206\u53c2\u6570\u5982\u4e0b\u8868\uff1a(\u5438\u7a0b\u662f\u6307\u6c34\u6cf5\u5230\u6c34\u9762\u7684\u8ddd\u79bb\uff1b\u626c\u7a0b\u662f\u6307\u6c34\u80fd\u88ab\u62bd\u5230\u7684\u6700\u9ad8\u70b9\u5230\u6c34\u9762\u7684\u8ddd\u79bb)
(1)\u8be5\u94ed\u724c\u4e2d\u6709\u4e00\u4e2a\u53c2\u6570\u662f\u660e\u663e\u9519\u8bef\u7684\uff0c\u8bf7\u4f60\u6307\u51fa\u6765\uff0c\u5e76\u901a\u8fc7\u8ba1\u7b97\u52a0\u4ee5\u8bf4\u660e.
(2)\u8be5\u6c34\u6cf5\u8fde\u7eed\u6b63\u5e38\u62bd\u6c341h\uff0c\u628a\u6c34\u62bd\u9ad8\u4e8650m\uff0c\u6c34\u6cf5\u5bf9\u6c34\u505a\u4e86\u591a\u5c11\u529f\uff1f\u6b64\u65f6\u6c34\u6cf5\u7684\u6548\u7387\u662f\u591a\u5c11\uff1f (g\u53d610N/kg)
\u89e3\uff1a(1)\u9519\u8bef\u7684\u53c2\u6570\u662f\uff1a\u5438\u7a0b 20m \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026(1\u5206)
\u4e00\u6807\u51c6\u5927\u6c14\u538b\u80fd\u628a\u6c34\u538b\u4e0a\u7684\u9ad8\u5ea6h=p\u03c1\u6c34g \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026(1\u5206)
=1.013\u00d7105Pa1.0\u00d7103kg/m3\u00d710N/kg =10.13m \uff1c20m \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026(1\u5206)
(2)\u6c34\u6cf51h\u62bd\u6c34\u4f53\u79efV=8m3 \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026(1\u5206)
\u6c34\u6cf51h\u62bd\u6c34\u8d28\u91cfm=\u03c1V=1.0\u00d7103kg/m3\u00d78m3=8\u00d7103kg \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026(1\u5206)
\u6c34\u6cf5\u62bd\u6c341h\u5bf9\u6c34\u505a\u7684\u529fW=Gh=mgh=8\u00d7103kg\u00d710N/kg\u00d750m=4\u00d7106J \u2026\u2026\u2026\u2026\u2026\u2026(1\u5206)
\u6c34\u6cf5\u62bd\u6c341h\u6d88\u8017\u7684\u7535\u80fdW\u2032=Pt=1.5\u00d7103W\u00d73600s=5.4\u00d7106J \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026(1\u5206)
\u6c34\u6cf5\u7684\u6548\u7387\u03b7=WW\u2032 \u00d7100%=4\u00d7106J5.4\u00d7106J \u00d7100%\u224874.1% \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026(1\u5206)
\uff082010\uff0e\u5929\u6d25\uff09\u67d0\u5efa\u7b51\u5de5\u5730\u4e0a\uff0c\u5de5\u4eba\u7528\u56fe15\u6240\u793a\u7684\u52a8\u6ed1\u8f6e\u5c06\u91cd450N\u7684\u7269\u4f53\u5300\u901f\u7ad6\u76f4\u63d0\u5347\u4e866m\uff0c\u82e5\u5df2\u77e5\u52a8\u6ed1\u8f6e\u6b64\u65f6\u7684\u673a\u68b0\u6548\u7387\u4e3a90\uff05\u3002
\u8bf7\u8ba1\u7b97\uff1b
(1)\u5de5\u4eba\u63d0\u5347\u91cd\u7269\u6240\u505a\u7684\u6709\u7528\u529f\u662f\u591a\u5c11?
W\u6709\u7528=Gh=450N\u00d76m=2700J

(2)\u5de5\u4eba\u63d0\u5347\u91cd\u7269\u6240\u505a\u7684\u603b\u529f\u662f\u591a\u5c11?
W\u603b= W\u6709\u7528/\u03b7=2700J /90\uff05=3000J
\uff082010\uff0e\u5b9c\u5bbe\uff09\uff0812\u5206\uff092009\u5e74\u79cb\u5b63\u4ee5\u6765\uff0c\u6211\u56fd\u897f\u5357\u90e8\u5206\u5730\u533a\u906d\u9047\u4e25\u91cd\u65f1\u707e\uff0c\u4e0d\u5c11\u5730\u65b9\u4e0d\u5f97\u4e0d\u9760\u6253\u6df1\u4e95\u53d6\u6c34\uff0e\u5982\u56fe\u6240\u793a\uff0c\u5c0f\u660e\u540c\u5b66\u6b63\u5229\u7528\u6ed1\u8f6e\u7ec4\u548c\u91d1\u5c5e\u6c34\u6876\u4ece\u6df1\u4e95\u4e2d\u63d0\u6c34\uff0c\u82e5\u6c34\u6876\u7684\u6750\u6599\u5bc6\u5ea6\u4e3a8g/cm3,\u6c34\u6876\u8d28\u91cf\u4e3a4kg\uff0c\u6c34\u6876\u5bb9\u79ef\u4e3a20L\uff0e\u5f53\u76db\u6ee1\u6c34\u7684\u6876\u4ece\u6c34\u4e2d\u6162\u6162\u63d0\u5347\uff08\u6876\u59cb\u7ec8\u672a\u51fa\u6c34\u9762\uff09\u65f6\uff0c\u5c0f\u660e\u5bf9\u7ef3\u7684\u62c9\u529b\u4e3aF=25N\uff0e\u4e0d\u8ba1\u7ef3\u5b50\u91cd\u91cf\u548c\u6469\u64e6\uff0c\u6c34\u7684\u5bc6\u5ea6\u662f1.0\u00d7103 kg/m3\uff0cg\u53d610N/kg\uff0e\u8bd5\u6c42\uff1a
\uff081\uff09\u52a8\u6ed1\u8f6e\u6709\u591a\u91cd\uff1f
\uff082\uff09\u6c34\u6876\u9732\u51fa\u6c34\u9762\u524d\uff0c\u6ed1\u8f6e\u7ec4\u7684\u673a\u68b0\u6548\u7387\u6709\u591a\u5927\uff1f
\uff083\uff09\u6c34\u6876\u88ab\u63d0\u79bb\u4e95\u4e2d\u6c34\u9762\u540e\uff0c\u4ee50.2m/s\u7684\u901f\u5ea6\u5300\u901f\u7ad6\u76f4\u4e0a\u5347\uff0c\u5c0f\u660e\u5bf9\u7ef3\u5b50\u81ea\u7531\u7aef\u62c9\u529b\u7684\u529f\u7387\u591a\u5927\uff1f
\u7b54\u6848\uff1a\uff081\uff09\u6c34\u6876\u7684\u91cd\u529b\u662f\uff1aG=mg=4kg\u00d710N/kg =40N
\u6c34\u6876\u7684\u4f53\u79ef\u662f\uff1aV\u6876=m/\u03c1=4kg /\uff088\u00d7103kg/m3\uff09=5\u00d710-4m3
\u6c34\u6876\u53d7\u5230\u7684\u6d6e\u529b\u662fF\u6d6e=\u03c1\u6c34gV\u6392=\u03c1\u6c34gV\u6876=1.0\u00d7103 kg/m3\u00d710N/kg\u00d75\u00d710-4m3=5N
\u7ef3\u5b50\u53d7\u5230\u6c34\u6876\u7684\u62c9\u529b\uff1aF\u62c9=G-F\u6d6e=40N-5N=35N
\u56e0\u4e3a\u4e0d\u8ba1\u7ef3\u5b50\u91cd\u91cf\u548c\u6469\u64e6\uff0c\u6709\u4e24\u80a1\u7ef3\u5b50\u627f\u91cd\uff0c\u6545\u6709\uff1a
F=(F\u62c9+G\u52a8)/2\uff0c\u5373\uff1a25N=(35N+ G\u52a8)/2\uff0c\u89e3\u5f97\uff1aG\u52a8=15N
\uff082\uff09\u6c34\u6876\u9732\u51fa\u6c34\u9762\u524d\uff0c\u6ed1\u8f6e\u7ec4\u7684\u673a\u68b0\u6548\u7387
=70%
\uff083\uff09\u6c34\u6876\u88c5\u6ee1\u65f6\u6c34\u7684\u8d28\u91cf\u662f\uff1am =\u03c1V =1.0\u00d7103 kg/m3\u00d720\u00d710-3m3=20kg
\u6c34\u548c\u6c34\u6876\u7684\u603b\u8d28\u91cf\u662f\uff1a20kg+4kg=24kg
\u6c34\u548c\u6c34\u6876\u7684\u603b\u91cd\u662f\uff1aG\u603b=m\u603bg=24kg\u00d710N/kg =240N
\u4eba\u7684\u62c9\u529b\u662f\uff1aF\u2032=\uff08G\u603b+ G\u52a8\uff09/2=\uff08240N+15N\uff09/2=127.5N
\u62c9\u529b\u79fb\u52a8\u7684\u901f\u5ea6\u662f\uff1av=2v\u7269=2\u00d70.2m/s =0.4m/s
\u62c9\u529b\u7684\u529f\u7387\u662f\uff1aP= F\u2032v=127.5N\u00d70.4m/s =51W


\uff082010\uff0e\u7389\u6eaa\uff09\u7389\u6eaa\u67d0\u73bb\u7483\u5382\u7528\u5706\u5f62\u4f4e\u538b\u5438\u76d8\u642c\u8fd0\u73bb\u7483\u3002\u5982\u56fe17\u4e2d \u4e3a\u5706\u5f62\u5438\u76d8\uff0c\u5176\u76f4\u5f84\u4e3a0.3m\uff0c \u4e3a\u4e00\u6b63\u65b9\u5f62\u5e73\u677f\u73bb\u7483\uff0c\u8fb9\u957f\u4e3a1m\uff0c\u91cd125.6N\u3002\u82e5\u5438\u76d8\u80fd\u5c06\u8be5\u5e73\u677f\u73bb\u7483\u6c34\u5e73\u5438\u4f4f\u5e76\u63d0\u53472m\uff0c\u5728\u6b64\u8fc7\u7a0b\u4e2d\u3002\u6c42
\uff081\uff09\u5e73\u677f\u73bb\u7483\u7684\u8d28\u91cf\u3002
\uff082\uff09\u5e73\u677f\u73bb\u7483\u589e\u52a0\u7684\u91cd\u529b\u52bf\u80fd\u3002
(3) \u5438\u76d8\u5185\u5916\u5927\u6c14\u538b\u7684\u5dee\u3002


\u89e3\uff1a\uff081\uff09\u6839\u636eG=mg\u5f97: m=

(2)

(3)



\uff082010\uff0e\u7389\u6eaa\uff09\u5982\u56fe18\u6240\u793a\uff0c\u5728\u9752\u6d77\u7389\u6811\u6297\u9707\u6551\u707e\u6e05\u7406\u5e9f\u589f\u8fc7\u7a0b\u4e2d\uff0c\u89e3\u653e\u519b\u90e8\u961f\u67d0\u6218\u58eb\u7528150kW\u7684\u94f2\u8f66\u5f00\u8db3\u9a6c\u529b\u5de5\u4f5c\u3002\u82e5\u94f2\u8f66\u75285s\u5300\u901f\u63a8\u8fdb\u4e863m\uff0c\u7136\u540e\u5c061.5t\u7684\u5efa\u7b51\u5e9f\u6599\u4e3e\u9ad83m\u88c5\u8f66\u8fd0\u8d70\uff0c\u6574\u4e2a\u8fc7\u7a0b\u662f\u8fde\u7eed\u7684\uff0c\u82e5\u67f4\u6cb9\u53d1\u7535\u673a\u7684\u70ed\u6548\u7387\u4e3a34.5%\u3002\uff08 \uff09\u6c42\uff1a
\uff081\uff09\u5728\u63a8\u571f\u8fc7\u7a0b\uff0c\u94f2\u8f66\u53d7\u5230\u7684\u963b\u529b\u3002
(2) \u5728\u4e3e\u9ad8\u8fc7\u7a0b\uff0c\u94f2\u8f66\u6240\u505a\u7684\u529f\u3002
\uff083\uff09\u6574\u4e2a\u8fc7\u7a0b\u6d88\u8017\u67f4\u6cb9\u591a\u5c11\u5343\u514b\uff1f

\u89e3\uff1a\uff081\uff09\u7531 \u5f97\uff1a

\u94f2\u8f66\u53d7\u5230\u7684\u963b\u529b

(2)

(3) \u94f2\u8f66\u5300\u901f\u524d\u8fdb\u65f6\u505a\u529f\uff1a

\u94f2\u8f66\u6574\u4e2a\u8fc7\u7a0b\u505a\u7684\u603b\u529f\uff1a

\u8bbe\u67f4\u6cb9\u71c3\u70e7\u653e\u51fa\u7684\u70ed\u91cf\u4e3a \uff0c

\u5219

\u7531 \u5f97\u67f4\u6cb9\u7684\u8d28\u91cf

15. \uff082010\uff0e\u5fb7\u5dde\u5e02\uff09\u5982\u56fe22\u6240\u793a\u88c5\u7f6e \uff0c\u7ef3\u91cd\u53ca\u6469\u64e6\u4e0d\u8ba1\u3002\u88c5\u5378\u5de5\u4eba\u5c06\u91cd\u4e3a800N\u7684\u8d27\u7269\u63d0\u81f3\u9ad8\u5904\uff0c\u4eba\u5bf9\u7ef3\u7684\u62c9\u529bF1\u4e3a500N\uff0c\u8d27\u7269\u57281min\u5185\u5300\u901f\u4e0a\u5347\u4e865m\u3002
\uff081\uff09\u8bf7\u5728\u56fe\u4e0a\u753b\u51fa\u7ef3\u5b50\u7684\u7ed5\u6cd5\uff1b
\uff082\uff09\u6c42\u6ed1\u8f6e\u7ec4\u7684\u673a\u68b0\u6548\u7387\uff1b
\uff083\uff09\u5982\u679c\u91cd\u7269\u662f600N\uff0c\u8981\u628a\u91cd\u7269\u63d0\u53475m\uff0c\u6c42\u62c9\u529b\u505a\u7684\u529f\u3002

\u89e3\uff1a\uff081\uff09\u7ed5\u6cd5\u5982\u56fe4\u6240\u793a\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026 2\u5206
\uff082\uff09 \uff1d \u00d7100%\uff1d \u00d7100%
\uff1d \u00d7100%\uff1d 80% \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20262\u5206
\uff083\uff09G\u52a8\uff1d2 F1\uff0dG\u7269\uff1d2\u00d7500\uff0d800\uff1d200N
F2\uff1d(G\u52a8\uff0b G\u7269)\uff0f2\uff1d\uff08600+200\uff09\uff0f2 N\uff1d400N
W\uff1d400\u00d75\u00d72 J\uff1d4000 J\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026 2\u5206

17\u3001\uff082010.\u5409\u6797\uff09\u5982\u56fe\u6240\u793a\uff0c\u5c0f\u521a\u540c\u5b66\u7684\u8d28\u91cf\u4e3a50kg\uff0c\u6bcf\u53ea\u978b\u5e95\u4e0e\u5730\u9762\u7684\u63a5\u89e6\u9762\u79ef\u4e3a200cm2\uff0c\u4ed6\u7528400N\u7684\u62c9\u529b\u901a\u8fc7\u5b9a\u6ed1\u8f6e\u5300\u901f\u62c9\u8d77\u91cd300N\u7684\u7269\u4f53\u3002\u6c42\uff1a\uff081\uff09\u4ed6\u4e0d\u62c9\u7269\u4f53\u7ad9\u5728\u5730\u9762\u4e0a\u65f6\u5bf9\u5730\u9762\u7684\u538b\u5f3a\uff1b\uff082\uff09\u62c9\u8d77\u91cd\u7269\u65f6\u5b9a\u6ed1\u8f6e\u7684\u673a\u68b0\u6548\u7387\u3002\uff08\u53d6g=10N/kg\uff09
\uff081\uff09G\uff1dmg\uff1d50kg\u00d710N/kg\uff1d500N
p\uff1d F S \uff1d G S \uff1d 500N 2\u00d7200\u00d710\uff0d4m2 \uff1d1.25\u00d7104Pa
\uff082\uff09\u03b7\uff1d W\u6709\u7528 W\u603b \uff1d G\u2032h F\u2032s \uff1d G\u2032 F\u2032 \uff1d 300N 500N \uff1d75%\uff08\u62160.75\uff09

22\uff0e\uff082010.\u695a\u96c4\u5dde\uff09\uff087\u5206\uff09\u5f53\u524d\u4e91\u5357\u7701\u906d\u9047\u4e86\u767e\u5e74\u4e0d\u89c1\u7684\u7279\u5927\u65f1\u707e\uff0c\u67d0\u6751\u54cd\u5e94\u653f\u5e9c\u53f7\u53ec\u79ef\u6781\u6253\u4e95\u6297\u65f1\u6551\u707e\u3002\u4ed6\u4eec\u51c6\u5907\u7528\u62bd\u6c34\u673a\u5728\u4e00\u53e3\u6253\u597d\u7684\u4e95\u4e2d\uff0c\u5c06\u4e95\u4e0b10m\u6df1\u7684\u6c34\u62bd\u5230\u5730\u9762\u3002\u82e5\u62bd\u6c34\u673a\u6bcf\u5c0f\u65f6\u62bd\u6c347.2\u00d7105kg\uff0c\u673a\u68b0\u6548\u7387\u4e3a50\uff05 .
\uff081\uff09\u62bd\u6c34\u673a\u6240\u505a\u7684\u6709\u7528\u529f\u662f\u591a\u5c11\uff1f
\uff082\uff09\u62bd\u6c34\u673a\u6240\u505a\u7684\u603b\u529f\u662f\u591a\u5c11\uff1f
\uff083\uff09\u62bd\u6c34\u673a\u6240\u505a\u7684\u603b\u529f\u7387\u662f\u591a\u5927\uff1f
\uff081\uff09W\u6709\u7528=Gh=mgh=7.2\u00d7105Kg\u00d710N/kg\u00d710m=7.2\u00d7107J
\uff082\uff09W\u603b= W\u6709\u7528 \u03b7 = 7.2\u00d7107J 50% =1.44\u00d7108J
\uff083\uff09P\u603b= W\u603b t = 1.44\u00d7108J 3600s =4\u00d7104W=40kW

1\uff0e(2010\uff0e\u54c8\u5c14\u6ee8) (6\u5206)\u5efa\u7b51\u5de5\u5730\u4e0a\uff0c\u5de5\u4eba\u4eec\u9700\u8981\u5c06\u4e00\u5806\u5efa\u6750\u8fd0\u523010m\u9ad8\u5904\u3002\u59dc\u8363\u540c\u5b66\u8bbe\u8ba1\u5b89\u88c5\u4e86\u5982\u56fe\u6240\u793a\u7684\u88c5\u7f6e.\u88c5\u7f6e\u4e2d\u6bcf\u4e2a\u6ed1\u8f6e\u91cdl00N\u3002\u5de5\u4eba\u5229\u7528\u8be5\u88c5\u7f6e\u6bcf\u6b21\u63d0\u5347\u4e00\u5757\u91cd900N\u7684\u5efa\u6750\uff0c\u8be5\u5de5\u4eba\u62c9\u7ef3\u5b50\u7684\u901f\u5ea6\u662f0.8m\uff0fs\uff0c\u5728\u65bd\u5de5\u8fc7\u7a0b\u4e2d\uff1a
(1)\u8be5\u5de5\u4eba\u63d0\u5347\u5efa\u6750\u65f6\u7684\u6709\u7528\u529f\u7387\u662f\u591a\u5c11?

(2)\u8be5\u88c5\u7f6e\u7684\u673a\u68b0\u6548\u7387\u662f\u591a\u5c11?(\u4e0d\u8ba1\u7ef3\u91cd\u548c\u6469\u64e6)

\u578b\u53f7\u989d\u5b9a\u7535\u538b\u989d\u5b9a\u529f\u7387
DJ\u2014\u2160220V0.8kW
DJ\u2014\u2161220V3.0kW
(3)\u5b59\u840d\u540c\u5b66\u60f3\u7528\u7535\u52a8\u673a\u505a\u52a8\u529b\u66ff\u4ee3\u4eba\u5de5\u4f5c\uff0c\u5c06\u8be5\u88c5\u7f6e\u6539\u9020\u6210\u7b80\u6613\u7684\u8d77\u91cd\u673a(\u540a\u8d77\u7269\u4f53\u7684\u901f\u5ea6\u9650\u5b9a\u57280.4m\uff0fs)\u3002\u5979\u5230\u4ed3\u5e93\u627e\u5230\u4e86\u4e24\u53f0\u7535\u52a8\u673a\uff0c\u94ed\u724c\u4e0a\u7684\u90e8\u5206\u6570\u636e\u5982\u4e0b\u8868\u6240\u793a\uff0c\u5979\u8981\u9009\u7528\u5176\u4e2d\u7684\u4e00\u53f0\u3002\u8bf7\u4f60\u5e2e\u52a9\u9009\u62e9\uff0c\u5c31\u4f60\u6240\u9009\u7684\u7535\u52a8\u673a\uff0c\u8bf4\u660e\u5982\u4f55\u4f7f\u7528\u8be5\u88c5\u7f6e\u624d\u80fd\u505a\u5230\u5408\u7406\u914d\u7f6e\u3002



\u89e3\uff1a\uff081\uff09\u63d0\u5347\u5efa\u6750\u65f6\u6240\u505a\u7684\u6709\u7528\u529fW\u6709\u7528=Gh=900N\u00d710m=90000J
\u4e0a\u5347\u901f\u5ea6V\u7269= =0.4m/s
\u6240\u7528\u65f6\u95f4t= =25s\uff081\u5206\uff09
\u6709\u7528\u529f\u7387P\u6709\u7528= =360W(1\u5206)
\uff082\uff09\u4eba\u7684\u62c9\u529bF= =500N\uff081\u5206\uff09
\u7ef3\u5b50\u81ea\u7531\u7aef\u79fb\u52a8\u7684\u8ddd\u79bbS\u7ef3=2S\u7269=2\u00d710m=20m
\u4eba\u6240\u505a\u7684\u603b\u529fW\u603b=FS\u7ef3=500N\u00d720m=10000J
\u673a\u68b0\u6548\u7387\u03b7= =90%\uff081\u5206\uff09
\uff083\uff09\u2460\u9009\u62e93.0kW\u7684\u7535\u52a8\u673a\uff0c\u4e00\u6b21\u63d0\u53478\u5757\u5efa\u6750\uff0c\u6548\u7387\u6700\u9ad8\u3002\uff082\u5206\uff09
[8\u5757\u5efa\u6750\uff081\u5206\uff09\uff08\u8bf4\u660e\u88c5\u7f6e\u81ea\u8eab\u6709\u80fd\u91cf\u6d88\u8017\uff0c\u63d0\u53477\u5757\u4e5f\u53ef\uff09\uff1b\u5728\u80fd\u62c9\u52a8\u7684\u6761\u4ef6\u4e0b\uff0c\u591a\u63d0\u5347\u5efa\u6750\u6548\u7387\u9ad8\u3002\uff081\u5206\uff09]
\u2461\u9009\u62e90.8kW\u7684\u7535\u52a8\u673a\u4e00\u6b21\u63d0\u53472\u5757\u5efa\u6750\uff0c\u6548\u7387\u6700\u9ad8\u3002\uff082\u5206\uff09
[2\u5757\u5efa\u6750\uff081\u5206\uff09\uff1b\u5728\u80fd\u62c9\u52a8\u7684\u6761\u4ef6\u4e0b\uff0c\u591a\u63d0\u5347\u5efa\u6750\u6548\u7387\u9ad8\u3002\uff081\u5206\uff09] (\u2460\u2461\u4efb\u9009\u5176\u4e00)



2\uff0e\uff082010•\u53f0\u5dde\uff09\u8fc7\u5c71\u8f66\u662f\u4e00\u79cd\u5bcc\u6709\u523a\u6fc0\u6027\u7684\u5a31\u4e50\u5de5\u5177\uff0c\u5b83\u7684\u8fd0\u52a8\u5305\u542b\u4e86\u8bb8\u591a\u79d1\u5b66\u539f\u7406\u3002\u516d\u4e00\u8282\u5c0f\u67ef\u7b2c\u4e00\u6b21\u4e58\u5750\u8fc7\u5c71\u8f66\u3002

(1)\u5c0f\u67ef\u5750\u5728\u8fc7\u5c71\u8f66\u4e0a\uff0c\u611f\u5230\u5929\u65cb\u5730\u8f6c\uff0c\u8fd9\u65f6\u4ed6\u662f\u4ee5___\u81ea\u5df1\u3001\u8f66\u53a2\u3001\u5ea7\u6905\u7b49\u5408\u7406\u7b54\u6848\u5747\u53ef________\u4e3a\u53c2\u7167\u7269\u7684\u3002
(2)\u8fc7\u5c71\u8f66\u7684\u8bbe\u8ba1\u8005\u901a\u8fc7\u8ba1\u7b97\u53d7\u529b\u56e0\u5b50\uff0c\u6765\u8861\u91cf\u5ea7\u6905\u65bd\u52a0\u7ed9\u6e38\u5ba2\u7684\u529b\uff0c\u8ba9\u8fd9\u4e9b\u529b\u65e2\u4f7f\u6e38\u5ba2\u611f\u5230\u523a\u6fc0\u53c8\u4e0d\u4f1a\u53d7\u4f24\u3002

\u5c0f\u67ef\u540c\u5b66\u7684\u8d28\u91cf\u4e3a50\u5343\u514b\uff0c\u5f53\u4ed6\u5750\u5728\u8fc7\u5c71\u8f66\u4e0a\u884c\u9a76\u5230\u8f68\u9053\u5e95\u90e8\u65f6\uff0c\u53d7\u529b\u56e0\u5b50\u4e3a2\u5982\u679c\u6b64\u65f6\u4ed6\u4e0e\u5ea7\u6905\u7684\u63a5\u89e6\u9762\u79ef\u4e3a500\u5398\u7c732\uff0c\u6c42\u6b64\u65f6\u4ed6\u5bf9\u5ea7\u6905\u7684\u538b\u5f3a\u3002\uff08g\u53d610\u725b/10\u5343\u514b\uff09
\uff083\uff09\u5f00\u59cb\u65f6\uff0c\u8fc7\u5c71\u8f66\u8f66\u53a2\u9700\u5148\u88ab\u673a\u68b0\u88c5\u7f6e\u63a8\u4e0a\u5761\u9876\u3002\u5c0f\u67ef\u540c\u5b66\u5750\u5b8c\u8fc7\u5c71\u8f66\u540e\uff0c\u5411\u7ba1\u7406\u5458\u4e86\u89e3\u5230\u5982\u56fe\u6240\u793a\u7684\u4e00\u7ec4\u6570\u636e\u3002\u8bf7\u4f60\u5e2e\u52a9\u5c0f\u67ef\u8ba1\u7b97\u4e00\u4e0b\uff0c\u6574\u5217\u8f66\u53a2\u4ece\u5e95\u7aef\u88ab\u63a8\u5230\u659c\u5761\u9876\u7aef\u65f6\u63a8\u529b\u6240\u505a\u7684\u529f\u3002\uff08\u4e0d\u8ba1\u8f66\u53a2\u7684\u957f\u5ea6\uff09

\u7b54\u6848\uff1a (2)G=mg=50kg\u00d710N/kg=500N
F=2G=2\u00d7500N =1000N
p=F/S=1000N/0. 05m2=20000Pa
(3)W =FS =15000N\u00d750m
=7.5\u00d710 5J

1.(2010\uff0e\u6c5f\u897f) \u201c\u4e94•\u4e00\u201d\u671f\u95f4\uff0c\u5baa\u5baa\u4ece\u4e0a\u6d77\u4e16\u535a\u4f1a\u4e39\u9ea6\u9986\u5e26\u56de\u4e00\u4e2a\u201c\u5c0f\u7f8e\u4eba\u9c7c\u201d\u5de5\u827a\u54c1\uff0c\u4ed6\u60f3\u77e5\u9053\u8fd9\u4e2a\u5de5\u827a\u54c1\u7684\u5bc6\u5ea6\uff0c\u4e8e\u662f\u8fdb\u884c\u4e86\u5b9e\u9a8c.\u8bf7\u4f60\u6839\u636e\u56fe16\u6240\u793a\u7684\u5b9e\u9a8c\u6570\u636e\u63a8\u7b97\uff1a\u3010\u6e29\u99a8\u63d0\u793a\uff1a\u6c34\u7684\u5bc6\u5ea6\u7528 \u8868\u793a\uff0c\u63a8\u7b97\u7ed3\u679c\u5747\u7528\u5b57\u6bcd\u8868\u793a\u3011
(1)\u5de5\u827a\u54c1\u6b64\u65f6\u6240\u53d7\u7684\u6d6e\u529b
(2)\u5de5\u827a\u54c1\u7684\u5bc6\u5ea6
\u89e3\uff1a(1)m\u6392=m1\uff0dm3 \u2026\u2026 (1\u5206)
F\u6d6e=G\u6392=m\u6392g=(m1\uff0dm3)g \u2026(2\u5206)
(2)m\u5de5\u827a\u54c1=m2\uff0dm3 \u2026\u2026(1\u5206)
V\u5de5\u827a\u54c1=V\u6392=m\u6392\u03c1\u6c34 =m1\uff0dm3\u03c1\u6c34 (1\u5206)
\u03c1\u5de5\u827a\u54c1=m\u5de5\u827a\u54c1V\u5de5\u827a\u54c1 = m2-m3m1-m3 \u03c1\u6c34\u2026\u2026 (2\u5206)
2\uff0e\uff082010\uff0e\u6cb3\u6c60\uff09\u4eca\u5e74\u521d\uff0c\u6cb3\u6c60\u5927\u90e8\u5206\u5730\u533a\u51fa\u73b0\u4e86\u4e25\u91cd\u7684\u65f1\u707e\uff0c\u4eba\u755c\u996e\u6c34\u56f0\u96be\uff0c\u8bb8\u591a\u7fa4\u4f17\u9700\u8981\u5230\u5f88\u8fdc\u7684\u5730\u65b9\u6311\u6c34\u996e\u7528\uff0e\u5c0f\u5b87\u540c\u5b66\u5728\u6311\u6c34\u65f6\u4e3a\u9632\u6b62\u6c34\u6e85\u51fa\u6876\u5916\uff0c\u5728\u6c34\u9762\u4e0a\u653e\u4e0a\u4e00\u8584\u6728\u677f\uff0c\u5982\u56fe18\u4e59\u6240\u793a\uff0c\u6728\u677f\u67093/4\u7684\u4f53\u79ef\u6ca1\u5165\u6c34\u4e2d\uff0e\u82e5\u8be5\u6728\u677f\u7684\u4f53\u79ef\u4e3a200cm3\uff0c\u6876\u5185\u6c34\u6df1\u4e3a35cm\uff0e\u6c42\uff1a
\uff081\uff09\u8584\u6728\u677f\u53d7\u5230\u7684\u6d6e\u529b\uff0e
\uff082\uff09\u6876\u5e95\u53d7\u5230\u6c34\u7684\u538b\u5f3a\uff0e
\uff083\uff09\u82e5\u8fd9\u62c5\u6c34\u603b\u91cd360N\uff0c\u6241\u62c5\u4e0e\u80a9\u8180\u7684\u63a5\u89e6\u9762\u79ef\u4e3a20cm2\uff0c\u5219\u5c0f\u5b87\u80a9\u8180\u53d7\u5230\u7684\u538b\u5f3a\u4e3a\u591a\u5927\uff1f
\u89e3:(1) \u7531\u9898\u77e5v\u6392= \u00d7200cm3=150cm3=1.5\u00d710-4m3
\u90a3\u4e48\u6728\u677f\u53d7\u5230\u7684\u6d6e\u529b\u4e3aF\u6d6e=\u03c1\u6c34gv\u6392 ..... (1\u5206)
=1000kg/m3\u00d710N/kg\u00d71.5\u00d710-4m3
=1.5N \u2026\u2026. (1\u5206)
(2) \u6876\u5e95\u53d7\u5230\u6c34\u7684\u538b\u5f3aP=\u03c1\u6c34gh ....... (1\u5206)
=1000kg/m3\u00d710N/kg\u00d70.35m
=3.5\u00d7103N \u2026\u2026\u2026(1\u5206)
(3) \u5c0f\u5b87\u80a9\u8180\u53d7\u5230\u7684\u538b\u5f3aP/=
= ......... (1\u5206)
=
=1.8\u00d7105Pa \u2026\u2026\u2026(1\u5206)
22\uff0e\uff082010\uff0e\u76d0\u57ce\u5e02\uff09\uff089\u5206\uff09\u4e00\u6839\u6728\u5934\u91cd\u4e3a1600N\uff0c\u4f53\u79ef\u4e3a0.2m3\uff0c\u6f02\u6d6e\u5728\u6c34\u9762\u4e0a\uff0cg\u53d610N/kg\uff0e\u6c42\uff1a
\uff081\uff09\u6728\u5934\u7684\u8d28\u91cf\uff1b
\uff082\uff09\u6728\u5934\u7684\u5bc6\u5ea6\uff1b
\uff083\uff09\u6728\u5934\u53d7\u5230\u7684\u6d6e\u529b\uff0e
\u5206\u6790\uff1a\u672c\u9898\u8981\u6c42\u5b66\u751f\u4f1a\u7ed3\u5408\u4e8c\u529b\u5e73\u8861\u77e5\u8bc6\uff0c\u7528\u7b80\u5355\u516c\u5f0f\u8ba1\u7b97\u8d28\u91cf\u3001\u5bc6\u5ea6\u3001\u6d6e\u529b\uff0c\u8ba4\u771f\u5b66\u4e60\u7684\u540c\u5b66\u90fd\u80fd\u591f\u505a\u597d\uff0e\u96be\u5ea6\u7cfb\u65700.8\uff0e\u6b63\u786e\u7b54\u6848\uff1a\uff081\uff09160 kg \uff082\uff09800 kg/ m3\uff083\uff091600N


17\uff0e\uff082010\uff0e\u5e7f\u5b89\u5e02\uff09\uff088\u5206\uff09\u4e0a\u5468\u5b66\u6821\u8d2d\u4e70\u4e86\u4e00\u6279\u6c34\u9f99\u5934\uff0c\u636e\u5546\u5bb6\u8bf4\u5176\u6750\u6599\u94dc\u8d28\u7684\uff0c\u5b9e\u9a8c\u5ba4\u7684\u8001\u5e08\u7ec4\u7ec7\u4e5d\u5e74\u7ea7\u7684\u4e00\u4e9b\u540c\u5b66\u901a\u8fc7\u5b9e\u9a8c\u6765\u9a8c\u8bc1\u5546\u5bb6\u7684\u8bf4\u6cd5\u3002\u4ed6\u4eec\u628a\u4e00\u4e2a\u6c34\u9f99\u5934\u7528\u8f7b\u8d28\u7ec6\u7ebf\u6346\u597d\u540e\u6302\u5728\u5f39\u7c27\u6d4b\u529b\u8ba1\u4e0a\uff0c\u5728\u7a7a\u6c14\u4e2d\u6d4b\u5f97\u5b83\u7684\u91cd\u529b\u4e3a1.6N\uff0c\u518d\u628a\u8fd9\u4e2a\u6c34\u9f99\u5934\u6d78\u6ca1\u5728\u6c34\u4e2d\uff0c\u5982\u56fe14\u6240\u793a\uff0c\u8fd9\u65f6\u5f39\u7c27\u6d4b\u529b\u8ba1\u7684\u8bfb\u6570\u4e3a1.4N\uff08\u03c1\u94dc=8.9\u00d7103kg/m3, g=10N/kg\uff09\u3002
\u6c42\uff1a\uff081\uff09\u6bcf\u4e2a\u6c34\u9f99\u5934\u7684\u8d28\u91cf\u662f\u591a\u5c11\uff1f
\uff082\uff09\u8fd9\u4e2a\u6c34\u9f99\u5934\u6d78\u6ca1\u5728\u6c34\u4e2d\u65f6\u6240\u53d7\u5230\u7684\u6d6e\u529b\u6709\u591a\u5927\uff1f
\uff083\uff09\u8fd9\u6279\u6c34\u9f99\u5934\u7684\u5bc6\u5ea6\u662f\u591a\u5c11\uff1f\u5546\u5bb6\u7684\u8bf4\u6cd5\u662f\u5426\u6b63\u786e\uff1f
\u89e3\uff1a\uff081\uff09m= =0.16kg=160g
\uff082\uff09F\u6d6e=G-F=1.6N-1.4N=0.2N
\uff083\uff09\u2235F\u6d6e=\u03c1\u6c34gV\u6392
\u2234V\u6392= =2\u00d710-5m3=20cm3
\u2234V=V\u6392=20cm3
\u2234\u03c1= =8g/cm3=8\u00d7103kg/m3
\u22358\u00d7103kg/m3<8.9\u00d7103kg/m3
\u6545\uff1a\u8fd9\u6279\u6c34\u9f99\u5934\u4e0d\u662f\u7eaf\u94dc\u7684\u3002
\u7b54\uff1a\u7565
\uff082010\uff0e\u5b9c\u5bbe\uff09\uff0812\u5206\uff092009\u5e74\u79cb\u5b63\u4ee5\u6765\uff0c\u6211\u56fd\u897f\u5357\u90e8\u5206\u5730\u533a\u906d\u9047\u4e25\u91cd\u65f1\u707e\uff0c\u4e0d\u5c11\u5730\u65b9\u4e0d\u5f97\u4e0d\u9760\u6253\u6df1\u4e95\u53d6\u6c34\uff0e\u5982\u56fe\u6240\u793a\uff0c\u5c0f\u660e\u540c\u5b66\u6b63\u5229\u7528\u6ed1\u8f6e\u7ec4\u548c\u91d1\u5c5e\u6c34\u6876\u4ece\u6df1\u4e95\u4e2d\u63d0\u6c34\uff0c\u82e5\u6c34\u6876\u7684\u6750\u6599\u5bc6\u5ea6\u4e3a8g/cm3,\u6c34\u6876\u8d28\u91cf\u4e3a4kg\uff0c\u6c34\u6876\u5bb9\u79ef\u4e3a20L\uff0e\u5f53\u76db\u6ee1\u6c34\u7684\u6876\u4ece\u6c34\u4e2d\u6162\u6162\u63d0\u5347\uff08\u6876\u59cb\u7ec8\u672a\u51fa\u6c34\u9762\uff09\u65f6\uff0c\u5c0f\u660e\u5bf9\u7ef3\u7684\u62c9\u529b\u4e3aF=25N\uff0e\u4e0d\u8ba1\u7ef3\u5b50\u91cd\u91cf\u548c\u6469\u64e6\uff0c\u6c34\u7684\u5bc6\u5ea6\u662f1.0\u00d7103 kg/m3\uff0cg\u53d610N/kg\uff0e\u8bd5\u6c42\uff1a
\uff081\uff09\u52a8\u6ed1\u8f6e\u6709\u591a\u91cd\uff1f
\uff082\uff09\u6c34\u6876\u9732\u51fa\u6c34\u9762\u524d\uff0c\u6ed1\u8f6e\u7ec4\u7684\u673a\u68b0\u6548\u7387\u6709\u591a\u5927\uff1f
\uff083\uff09\u6c34\u6876\u88ab\u63d0\u79bb\u4e95\u4e2d\u6c34\u9762\u540e\uff0c\u4ee50.2m/s\u7684\u901f\u5ea6\u5300\u901f\u7ad6\u76f4\u4e0a\u5347\uff0c\u5c0f\u660e\u5bf9\u7ef3\u5b50\u81ea\u7531\u7aef\u62c9\u529b\u7684\u529f\u7387\u591a\u5927\uff1f
\u7b54\u6848\uff1a\uff081\uff09\u6c34\u6876\u7684\u91cd\u529b\u662f\uff1aG=mg=4kg\u00d710N/kg =40N
\u6c34\u6876\u7684\u4f53\u79ef\u662f\uff1aV\u6876=m/\u03c1=4kg /\uff088\u00d7103kg/m3\uff09=5\u00d710-4m3
\u6c34\u6876\u53d7\u5230\u7684\u6d6e\u529b\u662fF\u6d6e=\u03c1\u6c34gV\u6392=\u03c1\u6c34gV\u6876=1.0\u00d7103 kg/m3\u00d710N/kg\u00d75\u00d710-4m3=5N
\u7ef3\u5b50\u53d7\u5230\u6c34\u6876\u7684\u62c9\u529b\uff1aF\u62c9=G-F\u6d6e=40N-5N=35N
\u56e0\u4e3a\u4e0d\u8ba1\u7ef3\u5b50\u91cd\u91cf\u548c\u6469\u64e6\uff0c\u6709\u4e24\u80a1\u7ef3\u5b50\u627f\u91cd\uff0c\u6545\u6709\uff1a
F=(F\u62c9+G\u52a8)/2\uff0c\u5373\uff1a25N=(35N+ G\u52a8)/2\uff0c\u89e3\u5f97\uff1aG\u52a8=15N
\uff082\uff09\u6c34\u6876\u9732\u51fa\u6c34\u9762\u524d\uff0c\u6ed1\u8f6e\u7ec4\u7684\u673a\u68b0\u6548\u7387
=70%
\uff083\uff09\u6c34\u6876\u88c5\u6ee1\u65f6\u6c34\u7684\u8d28\u91cf\u662f\uff1am =\u03c1V =1.0\u00d7103 kg/m3\u00d720\u00d710-3m3=20kg
\u6c34\u548c\u6c34\u6876\u7684\u603b\u8d28\u91cf\u662f\uff1a20kg+4kg=24kg
\u6c34\u548c\u6c34\u6876\u7684\u603b\u91cd\u662f\uff1aG\u603b=m\u603bg=24kg\u00d710N/kg =240N
\u4eba\u7684\u62c9\u529b\u662f\uff1aF\u2032=\uff08G\u603b+ G\u52a8\uff09/2=\uff08240N+15N\uff09/2=127.5N
\u62c9\u529b\u79fb\u52a8\u7684\u901f\u5ea6\u662f\uff1av=2v\u7269=2\u00d70.2m/s =0.4m/s
\u62c9\u529b\u7684\u529f\u7387\u662f\uff1aP= F\u2032v=127.5N\u00d70.4m/s =51W


( 2010\u4e4c\u9c81\u6728\u9f50)\u6709\u4e00\u4e2a\u5b9e\u5fc3\u5706\u67f1\u5f62\u7269\u4f53\uff0c\u7528\u5f39\u7c27\u6d4b\u529b\u8ba1\u5728\u7a7a\u6c14\u4e2d\u79f0\u91cd\u65f6\uff0c\u6d4b\u529b\u8ba1\u7684\u8bfb\u6570\u4e3a10N\uff1b\uff0c\u5f53\u628a\u7269\u4f53\u4e00\u534a\u4f53\u79ef\u6d78\u5165\u6c34\u4e2d\u65f6\uff0c\u6d4b\u529b\u8ba1\u7684\u8bfb\u6570\u4e3a4N\u3002\u6c42\uff1a
\u2474\u7269\u4f53\u7684\u4f53\u79ef\uff1b
\u2475\u628a\u7269\u4f53\u4ece\u5f39\u7c27\u6d4b\u529b\u8ba1\u4e0a\u53d6\u4e0b\u6295\u5165\u6c34\u4e2d\u9759\u6b62\u65f6\uff0c\u7269\u4f53\u53d7\u5230\u7684\u6d6e\u529b\u3002
\u7b54\u6848\uff1a\u89e3\uff1a\u2474F\u6d6e=G\u2014F\u793a=10N\u20144N=6N
F\u6d6e=\u03c1\u00d7g\u00d712 \u00d7V
\u89e3\u5f97V=1.2\u00d710-3m3
\u2475\u7269\u4f53\u7684\u5bc6\u5ea6\u03c1\u7269=GgV =0.83\u00d7l 03 kg /m3
\u56e0\u4e3a\u7269\u4f53\u7684\u5bc6\u5ea6\u5c0f\u4e8e\u6c34\u7684\u5bc6\u5ea6\uff0c\u6240\u4ee5\u7269\u4f53\u6f02\u6d6e
F\u6d6e=G=10N

1\uff0e(2010\uff0e\u67f3\u5dde)\u4eca\u5e74\u6625\uff0c\u6211\u56fd\u897f\u5357\u90e8\u5206\u5730\u533a\u53d1\u751f\u4e86\u7279\u5927\u65f1\u707e\uff0c\u89e3\u653e\u519b\u67d0\u90e8\u5728\u4e00\u4e2a\u5f88\u6df1\u7684\u5c71\u6d1e\u4e2d\u627e\u5230\u4e86\u6c34\u6e90\uff0c\u6c34\u6df14 m\u3002\u5b98\u5175\u4eec\u7528\u56fe20\u6240\u793a\u7684\u88c5\u7f6e\u63d0\u53d6\u4e00\u6876\u6c34\u8fdb\u884c\u62bd\u6837\u68c0\u6d4b\uff0c\u5df2\u77e5\u91d1\u5c5e\u6876\u7684\u5bb9\u79ef\u4e3a2\u00d7l0\u4e003m3\uff0c\u5728\u5300\u901f\u63d0\u8d77\u6876\u97f5\u8fc7\u7a0b\u4e2d\uff0c\u6876\u9732\u51fa\u6c34\u9762\u524d\u7684\u62c9\u529b\u4e3al0 N\uff0c\u5b8c\u5168\u9732\u51fa\u6c34\u9762\u540e\uff0c\u62c9\u529b\u53d8\u4e3a35 N(\u7ef3\u5b50\u4e0e\u6ed1\u8f6e\u95f4\u7684\u6469\u64e6\u53ca\u7ef3\u91cd\u4e0d\u6c41\uff0cg=10 N\uff0f\u338f)\u3002\u6c42\uff1a
\uff081\uff09\u6c34\u5e95\u53d7\u5230\u6c34\u7684\u538b\u5f3a\uff1b
\uff082\uff09\u91d1\u5c5e\u6876\u7684\u8d28\u91cf\uff1b
\uff083\uff09\u91d1\u5c5e\u6876\u7684\u91d1\u5c5e\u5bc6\u5ea6\u3002
\u89e3\uff1a\uff081\uff09\u6c34\u5e95\u53d7\u5230\u6c34\u7684\u538b\u5f3a\uff1aP=\u03c1gh\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20261\u5206
=1.0\u00d7103kg/m3\u00d710N/kg\u00d74m=4\u00d7104Pa\u2026\u2026\u2026\u2026\u20261\u5206
\uff082\uff09\u6876\u4e2d\u6c34\u7684\u8d28\u91cf\uff1am=\u03c1\u6c34V\u6c34\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20261\u5206
=1.0\u00d7103kg/m3\u00d72\u00d710-3kg=2kg\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20261\u5206
\u6876\u4e2d\u6c34\u7684\u91cd\u529b\uff1aG\u6c34=mg=2kg\u00d710N/kg=20N\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20261\u5206
\u6876\u7684\u8d28\u91cf\uff1am\u6876= =1.5kg\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20261\u5206
\uff083\uff09\u88c5\u6ee1\u6c34\u7684\u6876\u53d7\u5230\u7684\u6d6e\u529b\uff1aF=F2-F1=35N-10N=25N
\u6876\u4e2d\u7684\u6c34\u548c\u6876\u7684\u4f53\u79ef\uff1aV= =2.5\u00d710-3m3\u2026\u2026.1\u5206
\u91d1\u5c5e\u7684\u4f53\u79ef\uff1aV\u91d1\u5c5e=V-V\u6c34=2.5\u00d710-3m3-2\u00d710-3m3=0.5\u00d710-3m3\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20261\u5206
\u91d1\u5c5e\u7684\u5bc6\u5ea6\uff1a =3\u00d7103kg/m3\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20261\u5206

\u521d\u4e8c\u7269\u7406\u4e0b\u5b66\u671f\u671f\u672b\u6d4b\u8bd5\u9898 \uff0890\u5206\u949f\uff09
\u4e00\uff0c\u586b\u7a7a\u9898\uff1a\uff08\u6bcf\u7a7a1\u5206\uff0c\u517120\u5206\uff09
1\uff0c\u529b\u662f\u7269\u4f53\u5bf9________\u7684\u4f5c\u7528\uff0c\u7269\u4f53\u95f4\u529b\u7684\u4f5c\u7528\u662f________\u3002
2\uff0c\u725b\u987f\u7b2c\u4e00\u5b9a\u5f8b\u7684\u5185\u5bb9\u662f\uff1a\u4e00\u5207\u7269\u4f53\u5728________\u7684\u65f6\u5019\uff0c\u603b\u4fdd\u6301_____\u6216________\u72b6\u6001\u3002
3\uff0c\u538b\u5f3a\u662f\u8868\u793a___________\u7684\u7269\u7406\u91cf\uff1b\u6c34\u9762\u4e0b20\u7c73\u7684\u5730\u65b9\u53d7\u5230\u6c34\u7684\u538b\u5f3a\u662f________\u5e15\u3002
4\uff0c\u901a\u5e38\u628a\u7b49\u4e8e______\u6beb\u7c73\u6c34\u94f6\u67f1\u7684\u5927\u6c14\u538b\u53eb\u505a\u6807\u51c6\u5927\u6c14\u538b\uff1b1\u6807\u51c6\u5927\u6c14\u538b\u7b49\u4e8e________\u5e15\u3002
5\uff0c\u6d6e\u529b\u662f\u7531\u4e8e\u6db2\u4f53\u5bf9\u7269\u4f53\u5411\u4e0a\u548c\u5411\u4e0b\u7684________\u4ea7\u751f\u7684\uff0c\u6d6e\u529b\u7684\u65b9\u5411\u603b________\u3002
6\uff0c\u8d28\u91cf\u662f300\u514b\u7684\u5c0f\u7403\uff0c\u5f53\u5b83\u6f02\u6d6e\u5728\u6db2\u9762\u4e0a\u65f6\u53d7\u5230\u7684\u6d6e\u529b\u662f________\u725b\u987f\u3002
7\uff0c\u529b\u5b66\u91cc\u529f\u5305\u62ec\u7684\u4e24\u4e2a\u5fc5\u8981\u56e0\u7d20\uff0c\u4e00\u662f________________\uff0c\u4e8c\u662f________________\u3002
8\uff0c\u5728\u5e73\u76f4\u8def\u4e0a\u5300\u901f\u8fd0\u52a8\u7684\u6c7d\u8f66\uff0c\u5411\u524d\u7684\u7275\u5f15\u529b________\u5411\u540e\u7684\u6469\u64e6\u529b\uff1b\u5bc6\u5ea6\u5c0f\u4e8e\u6c34\u7684\u7269\u4f53\u6f02\u6d6e\u5728\u6c34\u4e2d\uff0c\u53d7\u5230\u7684\u6d6e\u529b________\u7269\u4f53\u7684\u91cd\u529b\u3002\uff08\u9009\u586b\u201c\u5927\u4e8e\u201d\u3001\u201c\u7b49\u4e8e\u201d\u6216\u201c\u5c0f\u4e8e\u201d\uff09
9\uff0c\u6760\u6746\u7684\u5e73\u8861\u662f\u6307\u6760\u6746\u5904\u4e8e____________\u6216_________________\u72b6\u6001\u3002
10\uff0c\u7528\u4e00\u4e2a\u52a8\u6ed1\u8f6e\u5c06\u8d28\u91cf\u662f100\u5343\u514b\u7684\u7269\u4f53\u5300\u901f\u63d0\u8d7710\u7c73\uff0c\u7528\u4e8610\u79d2\uff0c\u90a3\u4e48\u7ef3\u5b50\u81ea\u7531\u7aef\u4e0a\u5347\u7684\u901f\u5ea6\u662f___________\u7c73/\u79d2\uff0c\u63d0\u8d77\u7269\u4f53\u7684\u529f\u7387\u662f__________\u74e6\u3002
\u4e8c\uff0c\u9009\u62e9\u9898\uff1a\uff08\u6bcf\u98982\u5206\uff0c\u517150\u5206\uff09
1\uff0c\u4e0b\u9762\u54ea\u53e5\u8bdd\u8bf4\u5f97\u4e0d\u5bf9\uff1f\uff1a\uff08 \uff09
A\uff0c\u4e00\u4e2a\u7269\u4f53\u53d7\u5230\u4e86\u529b\uff0c\u4e00\u5b9a\u6709\u522b\u7684\u7269\u4f53\u5bf9\u5b83\u65bd\u529b\uff1b
B\uff0c \u4e0a\u5347\u7684\u6c22\u6c14\u7403\u6ca1\u6709\u53d7\u5230\u91cd\u529b\u7684\u4f5c\u7528\uff1b
C\uff0c\u6e38\u6cf3\u65f6\uff0c\u4eba\u5bf9\u6c34\u65bd\u52a0\u4e86\u529b\uff0c\u540c\u65f6\u6c34\u5bf9\u4eba\u4e5f\u65bd\u52a0\u4e86\u529b\uff1b
D\uff0c \u6302\u5728\u6811\u4e0a\u7684\u82f9\u679c\u4e5f\u8981\u53d7\u5230\u91cd\u529b\u7684\u4f5c\u7528\u3002
2\uff0c\u67d0\u540c\u5b66\u7528250\u725b\u987f\u7684\u529b\u7ad6\u76f4\u5411\u4e0a\u63d0\u8d77\u4e00\u4e2a\u91cd200\u725b\u987f\u7684\u6c34\u6876\u65f6\uff0c\u6876\u53d7\u5230\u7684\u5408\u529b\u7684\u5927\u5c0f\u548c\u65b9\u5411\u662f\uff1a\uff08 \uff09
A\uff0c 450\u725b\u987f\uff0c\u5411\u4e0a\uff1bB\uff0c 450\u725b\u987f\uff0c\u5411\u4e0b\uff1bC\uff0c 50\u725b\u987f\uff0c\u5411\u4e0b\uff1bD\uff0c50\u725b\u987f\uff0c\u5411\u4e0a\u3002
3\uff0c\u5173\u4e8e\u60ef\u6027\u73b0\u8c61\uff0c\u4e0b\u5217\u8bf4\u6cd5\u4e2d\u9519\u8bef\u7684\u662f\uff1a\uff08 \uff09
A\uff0c \u4eba\u8d70\u8def\u65f6\uff0c\u88ab\u77f3\u5934\u62cc\u5012\u4f1a\u5411\u524d\u5012\uff1b
B\uff0c \u7528\u94c1\u94f2\u628a\u6c99\u9001\u4e0a\u8f66\u53a2\u65f6\uff0c\u94c1\u94f2\u4e0d\u52a8\u4e86\uff0c\u6c99\u4ecd\u4f1a\u5411\u524d\u8fd0\u52a8\uff1b
C\uff0c \u7ad9\u5728\u8f66\u4e0a\u7684\u4e58\u5ba2\uff0c\u5f53\u8f66\u7a81\u7136\u5f00\u52a8\u65f6\uff0c\u4f1a\u5411\u524d\u5012\uff1b
D\uff0c \u684c\u9762\u4e0a\u6709\u4e00\u5f20\u5341\u5206\u5149\u6ed1\u7eb8\u6761\uff0c\u5728\u7eb8\u6761\u4e0a\u653e\u4e00\u53ea\u9e21\u86cb\u3002\u5f53\u5feb\u901f\u628a\u7eb8\u6761\u62bd\u6389\u540e\uff0c\u9e21\u86cb\u4ecd\u7559\u5728\u684c\u9762\u4e0a\u3002
4\uff0c\u4e0b\u9762\u54ea\u4e24\u4e2a\u529b\u662f\u5e73\u8861\u529b\uff1f\uff1a\uff08 \uff09
A\uff0c\u7528\u9493\u9c7c\u6746\u628a\u9493\u5230\u7684\u9c7c\u4ece\u6c34\u91cc\u52a0\u901f\u62c9\u4e0a\u6765\u65f6\uff0c\u62c9\u529b\u548c\u9c7c\u7684\u91cd\u529b\uff1b
B\uff0c \u6c7d\u8f66\u5728\u5e73\u76f4\u9053\u8def\u4e0a\u4f5c\u5300\u901f\u76f4\u7ebf\u8fd0\u52a8\u65f6\uff0c\u53d7\u5230\u7684\u7275\u5f15\u529b\u548c\u963b\u529b\uff1b
C\uff0c\u7528\u5f88\u5927\u7684\u529b\u6c14\u63a8\u7bb1\u5b50\uff0c\u7bb1\u5b50\u7ec8\u4e8e\u88ab\u63a8\u52a8\u4e86\uff0c\u4eba\u7684\u63a8\u529b\u548c\u7bb1\u5b50\u53d7\u5230\u7684\u6469\u64e6\u529b\uff1b
D\uff0c \u653e\u5728\u684c\u9762\u4e0a\u7684\u7535\u89c6\u673a\uff0c\u7535\u8bdd\u673a\u53d7\u5230\u7684\u91cd\u529b\u548c\u684c\u9762\u53d7\u5230\u7684\u538b\u529b\u3002
5\uff0c\u4e0b\u9762\u54ea\u79cd\u505a\u6cd5\u662f\u4e3a\u4e86\u51cf\u5c0f\u6469\u64e6\uff1f\uff1a\uff08 \uff09
A\uff0c\u5728\u978b\u5e95\u3001\u8f6e\u80ce\u4e0a\u523b\u6709\u51f9\u51f8\u4e0d\u5e73\u7684\u82b1\u7eb9\uff1bB\uff0c \u4e0b\u96e8\u5929\u5728\u6ce5\u6cde\u7684\u8def\u9762\u4e0a\u6492\u4e9b\u7089\u6e23\u6216\u6c99\u5b50\uff1b
C\uff0c\u7528\u6eda\u52a8\u6469\u64e6\u4ee3\u66ff\u6ed1\u52a8\u6469\u64e6\uff1bD\uff0c \u589e\u5927\u538b\u529b\u548c\u589e\u5927\u63a5\u89e6\u9762\u4e4b\u95f4\u7684\u7c97\u7cd9\u7a0b\u5ea6\u3002
6\uff0c\u4e0b\u9762\u54ea\u79cd\u8bf4\u6cd5\u662f\u9519\u8bef\u7684\uff1f\uff1a\uff08 \uff09
A\uff0c \u5e15\u65af\u5361\u6982\u62ec\u51fa\u529b\u5b66\u7684\u60ef\u6027\u89c4\u5f8b\uff1bB\uff0c \u9a6c\u5fb7\u5821\u534a\u7403\u7684\u5b9e\u9a8c\u8868\u660e\u5b58\u5728\u5927\u6c14\u538b\uff1b
C\uff0c \u963f\u57fa\u7c73\u5fb7\u53d1\u73b0\u4e86\u6d6e\u529b\u7684\u8ba1\u7b97\u65b9\u6cd5\uff1bD\uff0c \u6258\u91cc\u62c6\u5229\u5b9e\u9a8c\u6d4b\u51fa\u4e86\u5927\u6c14\u538b\u5f3a\u7684\u503c\u3002
7\uff0c\u4e00\u4e2a1\u725b\u987f\u7684\u94a9\u7801\uff0c\u6302\u5728\u5f39\u7c27\u79e4\u94a9\u4e0a\uff0c\u5f53\u94a9\u7801\u6d78\u6ca1\u5728\u6c34\u91cc\u65f6\uff0c\u5f39\u7c27\u79e4\u7684\u793a\u6570\u662f0.87\u725b\u987f\uff0c\u8fd9\u4e2a\u94a9\u7801\u53d7\u5230\u6c34\u7684\u6d6e\u529b\u662f\uff1a\uff08 \uff09
A\uff0c0.13\u725b\u987f \uff0cB\uff0c 1.87\u725b\u987f\uff1bC\uff0c 0.87\u725b\u987f\uff1bD\uff0c1\u725b\u987f\u3002
8\uff0c\u5982\u56fe\u6240\u793a\uff0c\u5728\u88c5\u6709\u6c34\u7684\u5bb9\u5668\u91cc\uff0c\u6c34\u5bf9\u5bb9\u5668\u91cca\u3001b\u3001c\u4e09\u70b9\u7684\u538b\u5f3a\u5927\u5c0f\u662f\uff1a\uff08 \uff09
A\uff0c\u6c34\u5bf9a\u70b9\u6ca1\u6709\u538b\u5f3a\uff1b B\uff0c \u6c34\u5bf9c\u70b9\u6ca1\u6709\u538b\u5f3a\uff1b
C\uff0c\u6c34\u5bf9a\u70b9\u7684\u538b\u5f3a\u6700\u5927\uff0c\u5bf9b\u70b9\u7684\u538b\u5f3a\u6700\u5c0f\uff1bD\uff0c \u6c34\u5bf9b\u70b9\u7684\u538b\u5f3a\u6700\u5927\uff0c\u5bf9a\u70b9\u7684\u538b\u5f3a\u6700\u5c0f\u3002

9\uff0c\u628a\u540c\u4e00\u4e2a\u5c0f\u7403\u653e\u5230\u4e09\u79cd\u5bc6\u5ea6\u4e0d\u540c\u7684\u6db2\u4f53\u91cc\uff0c\u5c0f\u7403\u9759\u6b62\u65f6\u7684\u60c5\u51b5\u5982\u56fe\u6240\u793a\uff0c\u90a3\u4e48\uff1a\uff08 \uff09
A\uff0c\u56fe\u7532\u6db2\u4f53\u7684\u5bc6\u5ea6\u6700\u5927\uff1bB\uff0c \u56fe\u4e59\u6db2\u4f53\u7684\u5bc6\u5ea6\u6700\u5927\uff1b
C\uff0c\u56fe\u4e19\u6db2\u4f53\u7684\u5bc6\u5ea6\u6700\u5927\uff1bD\uff0c \u56fe\u7532\u8ddf\u56fe\u4e59\u7684\u6db2\u4f53\u5bc6\u5ea6\u4e00\u6837\u5927\u3002
10\uff0c\u5982\u56fe\uff0c\u7532\u3001\u4e59\u3001\u4e19\u3001\u4e01\u662f\u56db\u4e2a\u4f53\u79ef\u3001\u5f62\u72b6\u76f8\u540c\u800c\u6750\u6599\u4e0d\u540c\u7684\u7403\uff0c\u6839\u636e\u5b83\u4eec\u5728\u6c34\u4e2d\u9759\u6b62\u4e0d\u52a8\u65f6\u7684\u60c5\u51b5\u53ef\u4ee5\u5224\u5b9a\u53d7\u5230\u5bc6\u5ea6\u6700\u5c0f\u7684\u662f\uff1a\uff08 \uff09
A\uff0c\u7532\uff1b B\uff0c \u4e59\uff1b C\uff0c\u4e19\uff1b D\uff0c \u4e01\u3002

11\uff0c\u4e0b\u9762\u5173\u4e8e\u6760\u6746\u7684\u8bf4\u6cd5\uff0c\u6b63\u786e\u7684\u662f\uff1a\uff08 \uff09
A\uff0c\u786c\u7684\u76f4\u68d2\u5c31\u662f\u6760\u6746\uff1bB\uff0c \u7b49\u81c2\u6760\u6746\u65e2\u4e0d\u7701\u529b\u4e5f\u4e0d\u8d39\u529b\uff1b
C\uff0c\u8d39\u529b\u6760\u6746\u7684\u52a8\u529b\u81c2\u6bd4\u963b\u529b\u81c2\u957f\uff1bD\uff0c \u4ece\u652f\u70b9\u5230\u963b\u529b\u4f5c\u7528\u70b9\u7684\u8fde\u7ebf\u53eb\u963b\u529b\u81c2\u3002
12\uff0c\u5982\u56fe\u6240\u793a\uff0c\u5f39\u7c27\u79e4\u5bf9\u6760\u6746\u62c9\u529b\u7684\u529b\u81c2\u4e0e\u94a9\u7801\u5bf9\u6760\u6746\u62c9\u529b\u7684\u529b\u81c2\u4e4b\u6bd4\u662f5:2\uff0c\u5f39\u7c27\u79e4\u8bfb\u6570\u662f4\u725b\uff0c\u6760\u6746\u91cd\u5ffd\u7565\u4e0d\u8ba1\uff0c\u5219\u94a9\u7801\u91cd\uff1a\uff08 \uff09
A\uff0c 10\u725b\uff1bB\uff0c 4\u725b\uff1bC\uff0c 2.5\u725b\uff1bD\uff0c1.6\u725b\u3002
13\uff0c\u5206\u522b\u7528\u56fe\u4e2d\u6240\u793a\u7684\u88c5\u7f6e\u7532\u548c\u4e59\u628a\u540c\u4e00\u91cd\u7269\u540a\u5230\u540c\u4e00\u9ad8\u5ea6\u65f6\uff1a\uff08 \uff09
A\uff0c \u7528\u88c5\u7f6e\u7532\u540a\u8d77\u91cd\u7269\u6bd4\u7528\u88c5\u7f6e\u4e59\u7701\u529b\uff1b
B\uff0c \u7528\u88c5\u7f6e\u4e59\u540a\u8d77\u91cd\u7269\u6bd4\u7528\u88c5\u7f6e\u7532\u7701\u529b\uff1b
B\uff0c \u7528\u88c5\u7f6e\u7532\u6216\u88c5\u7f6e\u4e59\u540a\u8d77\u91cd\u7269\u6240\u7528\u62c9\u529b\u76f8\u540c\uff1b
D\uff0c \u7528\u88c5\u7f6e\u4e59\u540a\u8d77\u91cd\u7269\uff0c\u52a8\u529b\u79fb\u52a8\u7684\u8ddd\u79bb\u6bd4\u7528\u88c5\u7f6e\u7532\u5c0f\u3002
14\uff0c\u4e0b\u5217\u54ea\u79cd\u60c5\u51b5\u4e0d\u662f\u91cd\u529b\u505a\u529f\uff1f\uff1a\uff08 \uff09
A\uff0c\u719f\u900f\u4e86\u7684\u82f9\u679c\u4ece\u6751\u4e0a\u6389\u5230\u5730\u4e0b\uff1bB\uff0c \u98de\u673a\u5728\u9ad8\u7a7a\u4f5c\u6c34\u5e73\u98de\u884c\uff1b
C\uff0c\u7ad6\u76f4\u5411\u4e0a\u629b\u540e\u7684\u77f3\u5757\u76f4\u5f80\u4e0b\u7838\uff1bD\uff0c \u653e\u8fdb\u6c34\u6c60\u91cc\u7684\u73bb\u7483\u7403\u6162\u6162\u4e0b\u6c89\u3002
15\uff0c\u5bf9\u4e8e\u4f7f\u7528\u6ed1\u8f6e\u7ec4\uff0c\u4e0b\u5217\u8bf4\u6cd5\u4e2d\u6b63\u786e\u7684\u662f\uff1a\uff08 \uff09
A\uff0c\u53ef\u4ee5\u7701\u529b\uff0c\u4f46\u5fc5\u987b\u6539\u53d8\u7528\u529b\u65b9\u5411\uff1bB\uff0c \u53ef\u4ee5\u7701\u529b\uff0c\u4f46\u4e0d\u80fd\u6539\u53d8\u7528\u529b\u65b9\u5411\uff1b
C\uff0c\u53ef\u4ee5\u7701\u529b\uff0c\u540c\u65f6\u6709\u53ef\u7701\u8ddd\u79bb\uff1bD\uff0c \u53ef\u4ee5\u7701\u529b\uff0c\u540c\u65f6\u53ef\u4ee5\u6539\u53d8\u7528\u529b\u7684\u65b9\u5411\uff0c\u4f46\u4e0d\u80fd\u540c\u65f6\u7701\u8ddd\u79bb\u3002
16\uff0c\u505a\u6258\u91cc\u62c6\u5229\u5b9e\u9a8c\u65f6\uff0c\u5982\u679c\u628a\u73bb\u7483\u7ba1\u503e\u659c\uff0c\u5728\u503e\u659c\u8fc7\u7a0b\uff1a\uff08 \uff09
A\uff0c\u73bb\u7483\u7ba1\u4e2d\u7684\u6c34\u94f6\u67f1\u957f\u5ea6\u59cb\u7ec8\u4e0d\u53d8\uff1bB\uff0c \u73bb\u7483\u7ba1\u4e2d\u7684\u6c34\u94f6\u67f1\u957f\u5ea6\u53d8\u5927\u3001\u7ad6\u76f4\u9ad8\u5ea6\u59cb\u7ec8\u4e0d\u53d8\uff1b
C\uff0c\u73bb\u7483\u7ba1\u4e2d\u7684\u6c34\u94f6\u67f1\u7684\u957f\u5ea6\u548c\u7ad6\u76f4\u9ad8\u5ea6\u90fd\u53d8\u5927\uff1bD\uff0c \u73bb\u7483\u7ba1\u4e2d\u7684\u6c34\u94f6\u67f1\u7684\u957f\u5ea6\u4e0d\u53d8\u3001\u7ad6\u76f4\u9ad8\u5ea6\u53d8\u5c0f\u3002
17\uff0c\u4e0b\u5217\u5de5\u5177\u4e2d\u5c5e\u4e8e\u7701\u529b\u7684\u6760\u6746\u662f\uff1a\uff08 \uff09
A\uff0c\u954a\u5b50\uff1b B\uff0c\u87ba\u4e1d\u5200\uff1b C\uff0c\u7406\u53d1\u526a\u5200\uff1b D\uff0c\u9493\u9c7c\u6746\u3002
18\uff0c\u4e00\u6728\u5757\u6d6e\u5728\u6c34\u9762\u65f6\uff0c\u67091/4\u7684\u4f53\u79ef\u9732\u51fa\u6c34\u9762\uff0c\u82e5\u622a\u53bb\u8fd9\u9732\u51fa\u6c34\u9762\u7684\u90e8\u5206\uff0c\u5219\u5269\u4e0b\u7684\u6728\u5757\u5c06\u4f1a\uff1a\uff08 \uff09
A\uff0c\u5168\u90e8\u6d78\u6ca1\u5728\u6c34\u4e2d\uff1b B\uff0c\u67091/4\u7684\u4f53\u79ef\u9732\u51fa\u6c34\u9762\uff1b
C\uff0c\u6709\u4e00\u534a\u9732\u51fa\u6c34\u9762\uff1b D\uff0c\u67093/4\u7684\u4f53\u79ef\u9732\u51fa\u6c34\u9762\u3002
19\uff0c\u5982\u56fe\u6240\u793a\uff0c\u6760\u6746OA\u7684B\u70b9\u6302\u7740\u4e00\u91cd\u7269\uff0cA\u7aef\u7528\u7ef3\u5b50\u540a\u5728\u6ed1\u73afM\u4e0b\uff0c\u6b64\u65f6OA \u6070\u597d\u6210\u6c34\u5e73\uff0c\u4e14A\u70b9\u4e0e\u5706\u5f27\u67b6PQ\u7684\u5706\u5fc3\u91cd\u5408\uff0c\u90a3\u4e48\u5f53\u6ed1\u73afM\u4eceP\u70b9\u9010\u6e10\u6ed1\u5230Q\u70b9\u7684\u8fc7\u7a0b\u4e2d\uff0c\u7ef3\u5b50\u5bf9A\u7aef\u62c9\u529b\u7684\u5927\u5c0f\u5c06\uff1a
A\uff0c\u4fdd\u6301\u4e0d\u53d8\uff1bB\uff0c\u9010\u6e10\u589e\u5927\uff1bC\uff0c\u9010\u6e10\u51cf\u5c11\uff1bD\uff0c\u7531\u5927\u53d8\u5c0f\u518d\u53d8\u5927\u3002

20\uff0c\u4e00\u4e2a\u94c1\u76d2\u6f02\u6d6e\u5728\u6c34\u9762\uff0c\u5f53\u94c1\u76d2\u503e\u659c\u540e\u56e0\u8fdb\u6c34\u800c\u6c89\u5165\u5bb9\u5668\u7684\u5e95\u90e8\u540e\uff0c\u5219\uff1a\uff08 \uff09
A\uff0c\u5bb9\u5668\u5185\u7684\u6c34\u9762\u5c06\u4e0b\u964d\uff1bB\uff0c \u5bb9\u5668\u5185\u7684\u6c34\u9762\u5c06\u5347\u9ad8\uff1bC\uff0c\u5bb9\u5668\u5185\u7684\u6c34\u9762\u5c06\u4e0d\u53d8\uff1b
D\uff0c \u65e0\u6cd5\u5224\u65ad\u6c34\u9762\u9ad8\u5ea6\u7684\u53d8\u5316\u3002
21, \u628a\u8d28\u91cf\u4e3a2\u5343\u514b\u3001\u4f53\u79ef\u4e3a1.8\u5206\u7c733\u7684\u7269\u4f53\u653e\u5165\u6c34\u4e2d\uff0c\u653e\u624b\u540e\u8fd9\u7269\u4f53\u5c06\u4f1a\uff1a
A\u3001 \u4e0a\u6d6e\uff1b B\u3001\u4e0d\u52a8\uff1b C\u3001\u4e0b\u6c89\uff1b D\u3001\u65e0\u6cd5\u786e\u5b9a\u3002
22\uff0c\u7532\u3001\u4e59\u4e24\u4eba\u722c\u5c71\u6bd4\u8d5b\uff0c\u5df2\u77e5\u4e24\u4eba\u7684\u4f53\u91cd\u4e4b\u6bd4\u4e3a3:2\uff0c\u722c\u5b8c\u76f8\u540c\u7684\u5c71\uff0c\u6240\u7528\u7684\u65f6\u95f4\u4e4b\u6bd4\u662f4: 3\uff0c\u5219\u7532\u4e59\u4e24\u4eba\u7684\u529f\u7387\u4e4b\u6bd4\u4e3a\uff1a\uff08 \uff09
A\uff0c1:2\uff1b B\uff0c2:1\uff1b C\uff0c8:9\uff1b D\uff0c9:8\u3002
23\uff0c\u7532\u4e59\u4e24\u4e2a\u673a\u68b0\uff0c\u7532\u673a\u68b0\u7684\u6548\u7387\u662f70%\uff0c\u4e59\u673a\u68b0\u7684\u6548\u7387\u662f50%\uff0c\u5219\uff1a\uff08 \uff09
A\uff0c\u4f7f\u7528\u7532\u673a\u68b0\u505a\u529f\u7701\u529b\uff1bB\uff0c \u4f7f\u7528\u4e59\u673a\u68b0\u505a\u529f\u591a\uff1bC\uff0c\u4f7f\u7528\u7532\u673a\u68b0\u505a\u529f\u5feb\uff1bD\uff0c \u4ee5\u4e0a\u8bf4\u6cd5\u90fd\u4e0d\u5bf9\u3002
24\uff0c\u7528200\u725b\u987f\u7684\u62c9\u529b\uff0c\u6cbf\u6c34\u5e73\u65b9\u5411\u62c9\u8d28\u91cf\u662f100\u5343\u514b\u7684\u5927\u8f66\u548c50\u5343\u514b\u7684\u5c0f\u8f66\uff0c\u5b83\u4eec\u90fd\u5728\u529b\u7684\u65b9\u5411\u4e0a\u79fb\u52a8\u4e8610\u7c73\uff0c\u62c9\u5927\u8f66\u548c\u5c0f\u8f66\u6240\u7528\u7684\u65f6\u95f4\u5404\u4e0d\u76f8\u540c\uff0c\u5219\uff1a
A\uff0c\u62c9\u5927\u8f66\u505a\u529f\u591a\uff1b B\uff0c\u62c9\u5c0f\u8f66\u505a\u529f\u591a\uff1bC\uff0c\u62c9\u5927\u8f66\u3001\u5c0f\u8f66\u505a\u529f\u4e00\u6837\u591a\uff1b
D\uff0c\u62c9\u5927\u8f66\u3001\u5c0f\u8f66\u505a\u529f\u5feb\u6162\u76f8\u540c\u3002
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1.47 2.45 6.0
2.0 1.96 4.0
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1、η=Ga/（Ga+G动） 即Ga/(Ga+G动)=80%
动滑轮连接3段绳子因此拉力F=（Ga+G动）/3 即 250=（Ga+G动）/3
两式联立解得Ga=600N,G动=150N
2、Va=m/ρa=60kg/（2×10^3kg/m^3）=0.03m^3
Vb=2Va=0.06m^3
m=ρbVb=2.5×10^3kg/m^3×0.06m^3=150kg
Gb=1500N
F=（Gb+G动）/3=(1500N+150N)/3=550N
人拉绳子的力和绳子拉人的力是相互作用力,因此绳子拉人的力也为550N.人在竖直方向受到3个力,即重力,绳子拉力和地面的支持力.重力和绳子拉力向下,支持力向上.由于人静止,因此合力为0.即G+F=F支,解得F支=1150N,支持力和人对地面的压力为相互作用力,因此人对地面的压力也是1150N.因此,P=F/S=1150N/0.04m^2=28750Pa

1、如右图所示，弹簧测力计下面悬挂一个重8N的物体。当把物体浸没在水中时，弹簧测力计示数变为6N，此时圆柱形容器内水的高度为0.2m（g=10N／kg）。求：

（1）物体受到水的浮力多大？

（2）物体的体积为多大？

（3）当物体浸没在水中时，水对容器底部的压强为多大？

2、工人师傅利用图示装置在5 S内将一个重为4500 N的物体A沿水平方向匀速向左拉动2 m。已知作用在绳自由端的拉力F为400 N，物体的底面积为1．5 m2，若物体滑动时受到的摩擦力大小是物重的0．2倍。求：

(1)物体A对地面的压强；

(2)拉力F做的功和功率；

(3)滑轮组的机械效率

没有图

题呢。看不见

图？

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