初二物理题，求大佬解答，必采纳 数学题初二实数部分，求大佬解答，必必必采纳？
\u4e09\u4e2a\u521d\u4e2d\u7269\u7406\u9898\uff0c\u6c42\u89e3\u7b54\uff0c\u5fc5\u91c7\u7eb3\uff1f\u7b2c3\u9898\u89e3\u9898\u8fc7\u7a0b\u5982\u4e0b\uff1a
\uff081\uff09P\u5bb9\u5668\u5e95=\u03c1\u6db2gh=\u03c1\u6db2\u00d710N/kg\u00d70.5m=5.0\u00d710^3Pa\uff0c\u03c1\u6db2=\uff085.0\u00d710^3Pa\uff09\u00f7\uff0810N/kg\u00d70.5m\uff09=1.0\u00d710^3kg/m^3
\uff082\uff09F\u538b=G\u6db2\u4f53=\u03c1\u6db2\u00d7V\u6db2\u00d7g=\uff081.0\u00d710^3kg/m^3\uff09\u00d7\uff082.0\u00d710^-3m^3\uff09\u00d7\uff0810N/kg\uff09=20N
\uff083\uff09PA\u70b9=\u03c1\u6db2gh=\uff081.0\u00d710^3kg/m^3\uff09\u00d7\uff0810N/kg\uff09\u00d7\uff080.5m-0.2m\uff09=3000Pa
\uff084\uff09\u5bb9\u5668\u5bf9\u684c\u9762\u7684\u538b\u529bF=G\u6db2\u4f53+G\u5bb9\u5668=20N+20N=40N
\u5bb9\u5668\u5bf9\u684c\u9762\u7684\u538b\u5f3aP=F/S=40N\u00f7\uff082.0\u00d710^-3m^2\uff09=20000Pa
\u7b2c4\u9898\u89e3\u9898\u8fc7\u7a0b\u5982\u4e0b\uff1a
\uff081\uff09F\u538b=P\u00d7S=\u03c1\u6c34\u00d7g\u00d7h\u00d7S=\uff081.0\u00d710^3kg/m^3\uff09\u00d7\uff0810N/kg\uff09\u00d7\uff080.12m\uff09\u00d7\uff084.0\u00d710^-3m^2\uff09=4.8N
\uff082\uff09P\u8336\u58f6=\uff08G\u8336\u58f6+G\u6c34\uff09/S=\uff080.4kg+0.6kg\uff09\u00d7\uff0810N/kg\uff09/\uff084.0\u00d710^-3m^2\uff09=2500Pa
\u7b2c5\u9898\u89e3\u9898\u8fc7\u7a0b\u5982\u4e0b\uff1a
\uff081\uff09P=F/S=\uff080.15kg\uff09\u00d7\uff0810N/kg\uff09/\uff081\u00d710^-3m^2\uff09=1500Pa
\uff082\uff09F\u603b=P\u00d7S=\uff082.7\u00d710^3Pa\uff09\u00d7\uff081\u00d710^-3m^2\uff09=2.7N
m\u603b=G/g=F\u603b/g=\uff082.7N\uff09/\uff0810N/kg\uff09=0.27kg
m\u73bb\u7483\u676f=m\u603b-m\u6c34=0.27kg-0.15kg=0.12kg
1: x=(343^1/3+1)*1/2
2:x=0
3\uff1a10
4\uff1a\u6839\u53f73\uff083^1/3\uff09
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绛旓細瑙ｆ瀽锛氬０闊冲湪鍥轰綋涓紶鎾緱鏈蹇紝鍦ㄦ恫浣撲腑鍏舵锛屽湪姘斾綋涓紶鎾緱鏈鎱紟宀歌竟椋炵繑鐨勯笩鍜屾暎姝ョ殑浜哄惉蹇墖鐨勫０闊虫槸浠庣┖姘斾腑浼犳潵鐨勶紝楸煎惉鍒扮殑澹伴煶鏄粠姘翠紶鍘荤殑锛屾墍浠ュ簲褰撴槸楸煎厛鍚埌澹伴煶锛屾晠閫塀锛庡彲浠閲囩撼涔堜翰~
绛旓細绗3棰樿В棰樿繃绋嬪涓嬶細锛1锛塒瀹瑰櫒搴=蟻娑瞘h=蟻娑裁10N/kg脳0.5m=5.0脳10^3Pa锛屜佹恫=锛5.0脳10^3Pa锛壝凤紙10N/kg脳0.5m锛=1.0脳10^3kg/m^3 锛2锛塅鍘=G娑蹭綋=蟻娑裁梀娑裁梘=锛1.0脳10^3kg/m^3锛壝楋紙2.0脳10^-3m^3锛壝楋紙10N/kg锛=20N 锛3锛塒A鐐=蟻娑瞘h=锛1.0脳10^3...
绛旓細2銆乂=m/蟻=237g/7.9=30cm^3 3銆佅=m/v=18kg/0.03m^3=600kg/m^3 4銆佅=m/v=3560kg/0.4m^3=8900kg/m^3 5銆乵=蟻v=900kg/m^3脳4脳10^-3=3.6kg 甯屾湜瀵逛綘鏈夊府鍔 鏈閲囩撼
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绛旓細姝ら鑰冩煡鐨勬槸鍘嬪己璁＄畻鍏紡鐨勫簲鐢锛岃В绛鐨勫叧閿槸鏍规嵁绛夐噺鍏崇郴鍒楀嚭姝ｇ‘鐨勬柟绋嬶紟11.銆愯В鏋愩戝湪姘村钩闈笂锛岀墿浣撳姘村钩闈㈢殑鍘嬪姏绛変簬鐗╀綋鐨勯噸鍔涳紝鐭ラ亾浜虹殑璐ㄩ噺锛屽彲鍒╃敤鍏紡G=mg璁＄畻浜虹殑閲嶅姏锛屽張鐭ラ亾浠拌汉鍦ㄧ‖鏉垮簥涓婂拰鈥滃腑姊︽濃濊蒋搴婁笂锛岃韩浣撲笌搴婄殑鎺ヨЕ闈㈢Н锛屽彲鍒╃敤鍏紡P= FS璁＄畻涓ょ鎯呭喌涓嬬殑鍘嬪己锛屽湪杩涜姣旇緝...
绛旓細鐗╀綋娴告病鍦ㄦ按涓椂锛孷鎺=V鐗=0.4dm^3=0.0004m^3 鎵浠娴=G鎺=蟻娑 g V鎺=1.0*10^3 kg/m^3 * 9.8N/kg * 0.0004m^3=3.92N 鑰 F娴<G鐗 鎵浠ヨ鐗╀綋鍦ㄦ按涓細涓嬫矇骞舵蹈娌 杩欎釜鏃跺欏彈鍒扮殑娴姏鍗充负 3.92N 杩囩▼涓殑绗﹀彿 * 琛ㄧず涔樺彿锛涚鍙 ^ 琛ㄧず骞傦紝渚嬪 4^3 琛ㄧず4鐨3娆″箓 ...
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绛旓細鍒濅簩鐗╃悊棰,姹傚ぇ浣В绛,蹇呴噰绾 闅忕潃鐢电儹姘村櫒鐨勪笉鏂敼杩,濡傚浘鎵绀虹殑鐢电儹姘村６娣卞彈浜轰滑鐨勫枩鐖便傚畠鐨勫绉负2L,澹惰韩鍜屽簳搴х殑鎬昏川鏈鏄痩.2kg,搴曞骇涓庢按骞虫闈㈢殑鎺ヨЕ闈㈢Н涓250cm2,瑁呮弧姘村悗姘存繁l6cm銆(蟻姘=1.0脳l03kg/m... 闅忕潃鐢电儹姘村櫒鐨勪笉鏂敼杩,濡傚浘鎵绀虹殑鐢电儹姘村６娣卞彈浜轰滑鐨勫枩鐖便傚畠鐨勫绉负2L,澹惰韩鍜屽簳搴х殑...
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