一道初三的压强物理题
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B\u8bf4\u622a\u53bb\u9ad8\u5ea6\u76f8\u540c\u7684\u90e8\u5206\uff0c\u8fd8\u662fh\u7532\u5927\u4e8eh\u4e59\uff0c\u6839\u636eP=pgh\uff0c \u6240\u4ee5p\u7532\u5927\u4e8ep\u4e59\uff0c\u6240\u4ee5B\u9519
D\u8bf4\u5206\u522b\u4ee5\u7532\u4e59\u7269\u4f53\u4e0a\u8868\u9762\u7684\u9762\u79ef\u5927\u5c0f\u52a0\u4e0a\u76f8\u540c\u9ad8\u5ea6\u7684\u8be5\u79cd\u7269\u8d28\uff0c\u90a3\u4e48\u8fd8\u662fh\u7532\u5927\u4e8eh\u4e59\uff0c\u6839\u636eP=pgh\uff0c \u6240\u4ee5p\u7532\u5927\u4e8ep\u4e59\uff0c\u6240\u4ee5D\u9519
\u518d\u770bC\uff0c\u5c06\u8d28\u91cf\u76f8\u540c\u7684\u7269\u4f53\u5206\u522b\u653e\u5728\u7532\u4e59\u7684\u4e0a\u9762\uff0c\u5219\u53ef\u770b\u4f5c\u662f\u5e95\u9762\u79ef\u76f8\u540c\u7684\u4e24\u7269\u4f53\uff08\u4f46\u9ad8\u5ea6\u4e0d\u540c\uff09\u5206\u522b\u653e\u5728\u7532\u4e59\u7684\u4e0a\u9762\uff0c\u56e0\u4e3a\u7532\u7684\u5e95\u9762\u79ef\u5927\u4e8e\u4e59\uff0c\u6240\u4ee5\u653e\u5728\u7532\u4e0a\u7684\u7269\u4f53\u9ad8\u5ea6\u8981\u6bd4\u653e\u5728\u4e59\u4e0a\u7684\u7269\u4f53\u9ad8\u5ea6\u5c0f\uff0c\u6240\u4ee5\u7532\u4e0e\u6240\u653e\u7269\u4f53\u7684\u9ad8\u5ea6\u548c\u6709\u53ef\u80fd\u4e0e\u4e59\u4e0e\u6240\u653e\u7269\u4f53\u7684\u9ad8\u5ea6\u548c\u76f8\u7b49\uff0c\u6839\u636eP=pgh\uff0cp\u7532\u53ef\u80fd\u7b49\u4e8ep\u4e59\uff0c\u5bf9\u5427\uff1f\uff01
\u03c1\u6c34*g*h=\u03c1\u786b\u9178\u94dc*g*H
1.0*10\u4e09\u6b21\u65b9*g*12cm=1.2*10\u7684\u4e09\u6b21\u65b9*g*H
H=10cm
\u9009C
绛旓細瑙ｏ細鍥犱负h=3m,娑蹭綋鏄按鍗虫槸瀵嗗害蟻姘达紳1.0脳103kg/m3,鍥犳鍙眰鍑鸿鐐瑰彈鍒鐨勫帇寮锛屽嵆P=蟻gh=1.0脳103kg/m3脳9.8N/kg脳3m=2.94脳104pa 鍙堝洜璇ユ礊鐨勯潰绉负s=10cm2=10脳10-4m2 鎵浠ヨ娲炴墍鍙楃殑鍘嬪姏涓篎=Ps=2.94脳103pa脳10脳10-4m2=29.4N 鎵浠ヨ鍫典綇杩欎釜娲烇紝鍘嬪姏鑷冲皯涓29.4N ...
绛旓細1銆佸鍥炬墍绀哄鍣紝涓婇儴鍒嗘í鎴潰绉槸s1锛屽簳閮ㄦí鎴潰绉槸s2锛屽鍣ㄤ笂涓嬩袱閮ㄥ垎楂樺垎鍒负h1锛宧2瀹瑰櫒涓洓鏈夋煇绉嶆恫浣擄紝鏈変竴涓┖蹇冮噾灞炵悆鐢ㄧ粏缁崇郴浣忥紝缁冲瓙鐨勫彟涓绔嫶鍦ㄥ鍣ㄥ簳閮紝姝ゆ椂鐞冨叏閮ㄦ蹈鍏ュ湪娑蹭綋涓紝濡傚浘鎵绀轰綅缃紝缁冲瓙瀵圭悆鐨勬媺鍔涙槸F銆傚灏嗙粏缁冲壀鏂┖蹇冮噾灞炵悆闈欐鍚庯紝娑蹭綋瀵瑰鍣ㄥ簳閮鐨勫帇寮鍑忓皯浜哶__锛堢敤瀛...
绛旓細鍥犱负p=F/S鎵浠=锛6N)/0.02m2=3脳103Pa 鍥犱负杩欓噷鐨勫姏鏄寚鐗╀綋瀵规枩闈㈢殑鍔涗笉鏄墿浣撶殑閲嶅姏
绛旓細鐭冲ご鐨勪綋绉笉鍙橈紝鍐扮啍鍖栨垚姘翠綋绉噺灏忥紝娑查潰涓嬮檷涓嬮檷鐨勯珮搴1=P1/蟻姘磄=44.8Pa梅1000Kg/m^3梅10N/Kg=0.00448m=0.448cm鍑忓皯鐨勪綋绉柍V=S搴昲1=125cm^2脳0.448cm=56cm^3璁惧啺鐨勮川閲忎负m鍐癿鍐/蟻鍐-m鍐/蟻姘=鈻砎m鍐=鈻砎蟻姘聪佸啺/(蟻姘-蟻鍐)=56cm^3脳1g/cm^3脳0.9g/cm^3梅(...
绛旓細P=pgh=800脳9.8脳0.2=1568Pa F=Ps=1568脳0.01=15.68N 甯屾湜瀵逛綘鏈夊府鍔 鏈涢噰绾
绛旓細瑙ｆ瀽锛氾紙1锛夌墿鍧楁斁鍏ョ敳娑蹭綋涓紓娴紝鍙楀埌鐨勬诞鍔涚瓑浜庣墿閲嶏紱鐗╁潡鏀惧叆涔欐恫浣撲腑鎮诞锛屽彈鍒扮殑娴姏绛変簬鐗╅噸锛涚敱姝ゅ彲浠ュ緱鍑虹墿鍧楀湪涓ょ娑蹭綋涓彈鍒扮殑娴姏鍏崇郴锛涳紙2锛夋牴鎹诞鍔涗骇鐢熺殑鍘熷洜鏄恫浣撳鐗╀綋涓婁笅琛ㄩ潰鐨勫帇鍔涘樊锛屾潵鍒嗘瀽涓ょ墿鍧楃殑涓嬭〃闈㈠鎵鍙楀埌娑蹭綋鍘嬪己澶у皬鍏崇郴锛庤В锛氾紙1锛夌墿鍧楁斁鍏ョ敳娑蹭綋涓紓娴紝鎵浠鐢=G锛涚墿鍧...
绛旓細鏍规嵁棰樼洰 蟻鐢/蟻涔=2/1锛宧鐢/h涔=3/2锛孲鐢/S涔=4/3,浣撶Н V=Sh, 鈭碫鐢/V涔=2/1 璐ㄩ噺 m=蟻V, 鈭磎鐢/m涔=4/1 閲嶅姏 G=mg, 鈭碐鐢/G涔=4/1 鈶 鍙 鈭礔=G鐢+G涔=15N 鈶 鐢扁憼鈶″緱 G鐢=12N锛孏涔=3N 鑻ュ皢涔欏崟鐙斁鍦ㄦ闈笂锛屽妗岄潰鐨勫帇寮 p涔=F涔/S涔=G涔/...
绛旓細灏嗕箼鎴幓鐨勯儴鍒嗗彔鏀惧湪鐢插墿浣欓儴鍒嗙殑涓婇潰涔嬪悗锛鍘嬪己涓篜1锛屾鏃 P1=銆恘G鐢+锛1-n锛壝桮涔欍/nS鐢 灏嗙敳鎴幓鐨勯儴鍒嗗彔鏀惧湪涔欏墿浣欓儴鍒嗙殑涓婇潰涔嬪悗锛屽帇寮轰负P2锛屾鏃 P2=銆愶紙1-n锛壝桮鐢+nG涔欍/nS涔 鐜板湪鐨勯棶棰灏卞彉鎴愪簡姣旇緝P1鍜孭2鐨勫ぇ灏忓叧绯讳簡锛岃繖涓柟娉曟瘮杈冨锛屽彲浠ュ仛宸瘮杈冿紝鍗宠绠桺1-P2 涔熷彲浠ュ仛...
绛旓細鑰冪偣锛氬帇寮虹殑澶у皬鍙婂叾璁＄畻锛涘瘑搴﹀叕寮忕殑搴旂敤锛涙恫浣撳帇寮鸿绠楀叕寮忕殑搴旂敤锛庝笓棰橈細鍘嬪己銆佹恫浣鐨勫帇寮锛庡垎鏋愶細锛1锛夊埄鐢ㄥ叕寮徬= m V 鐨勫彉褰㈠彲鐩存帴姹傛按鐨勮川閲忥紱锛2锛堿瀹瑰櫒瀵规按骞虫闈㈢殑鍘嬪己灞炲浐浣撳帇寮猴紝鍏跺帇鍔涗负姘村拰瀹瑰櫒鐨勬婚噸鍔涳紝鍐嶅埄鐢ㄥ叕寮弍= F S 鏉ユ眰瀵规闈㈢殑鍘嬪己锛涳紙3锛夌煡閬撳鍣ㄧ殑搴曢潰绉互鍙婃按鍜岄厭绮剧殑...
绛旓細瑙ｏ細1銆佺瀹瑰櫒搴8cm澶凙鐐规按娣变负锛18-8=10cm锛屾墍浠鐐瑰彈鍒版按鐨勫帇寮鏄細P=10锛坈mH2O锛=100mmH2O=1000Pa 鏂瑰悜鏄寚鍚慉鐐广2銆佹按瀵瑰鍣ㄥ簳鐨勫帇寮轰负锛歅=18(cmH2O)=1800Pa 姘村瀹瑰櫒搴曠殑鍘嬪姏涓猴細F=PS=(1800/100000)*50=0.9kgf 3銆佸鍣ㄥ妗岄潰鐨勫帇鍔涗负锛欶=G姘=1kgf 瀹瑰櫒瀵规闈㈢殑鍘嬪己涓猴細P=...
