Question

16£®ÈýÏ¿´¬Õ¢ÊÇÊÀ½çÉÏ×î´óµÄ´¬Õ¢£¬¹²ÓÐ5¼¶Õ¢ÊÒ£¬Ã¿¸öÕ¢ÊÒˮλ±ä»¯³¬¹ý20m£¬Õ¢ÃÅÓɸÖÖƲÄÁÏÖƳɣ¬ÆäÊ×¼¶ÈË×ÖÕ¢ÃÅÿÉÈßß40m£¬¿í20m£¬ºñ3m£¬ÈçͼËùʾ£¬ÏÖÓÐÒ»ËÒÂÖ´¬´ÓˮλÊÇ150mµÄÉÏÓνøÈëÊ×¼¶Õ¢ÊÒ£¬µ±Ê×¼¶Õ¢ÊÒµÄˮλ½µµ½130mʱ£¬ÂÖ´¬¾Í¿ÉÒÔ½øÈëÏÂÒ»¼¶Õ¢ÊÒÁË£®Ç󣺣¨¸ÖµÄÃܶÈÈ¡¦Ñ_¸Ö=8¡Á10³kg/m³£¬gÈ¡10N/kg£©£®
£¨1£©ÆäÖÐÒ»ÉÈÊ×¼¶ÈË×ÖÕ¢ÃŵÄÖÊÁ¿ÊǶà´ó£¿
£¨2£©ÂÖ´¬Í¨¹ýÊ×¼¶Õ¢ÊҵĹý³ÌÖУ¬Õ¢Êҵײ¿Êܵ½Ë®µÄѹǿ¼õÉÙÁ˶àÉÙ£¿
£¨3£©Ò»ÉÈÊ×¼¶ÉÏÓÐÕ¢ÃÅÃæ¶ÔÉÏÓÎˮλµÄÒ»ÃæÊܵ½µÄË®µÄѹÁ¦´óÔ¼ÊǶà´ó£¿

Answer 1

·ÖÎö £¨1£©Çó³öÕ¢ÃŵÄÌå»ý£¬ÓÉm=¦ÑV¿ÉÇóµÃÈË×ÖÕ¢ÃŵÄÖÊÁ¿£»
£¨2£©ÓûÇóÕ¢Êҵײ¿Êܵ½Ë®µÄѹǿ¼õÉÙÁ˶àÉÙ£¬Ö»ÐèÖªµÀË®µÄ¸ß¶È½µµÍÁ˶àÉÙ£¬´úÈë¡÷p_µ×=¦Ñ_Ë®g¡÷h_Ë®¿ÉÇóµÃ£»
£¨3£©ÓÉÓÚÕ¢ÃÅÃæ¶ÔÉÏÓÎˮλµÄÒ»ÃæË®ÉîΪ150m£¬Ôò¶ÔÕ¢ÃŲúÉúµÄƽ¾ùѹǿΪÉî¶ÈµÄÒ»°ë²úÉúµÄѹǿ£¬¾Ý´ËÇó³öƽ¾ùѹǿ£¬ÀûÓÃѹǿ¶¨ÒåʽÇóÕâÉÈÕ¢ÃÅËùÊÜË®µÄѹÁ¦£®

½â´ð ½â£º£¨1£©Õ¢ÃŵÄÌå»ýV=40m¡Á20m¡Á3m=2400m³£¬
ÓɦÑ=$\frac{m}{V}$µÃ£ºm_¸Ö=¦Ñ_¸ÖV=8¡Á10³kg/m³¡Á2400m³=1.92¡Á10⁷kg£»
£¨2£©ÓÉÓÚ¡÷h_Ë®=150m-130m=20m£¬
Ôò¡÷p_µ×=¦Ñ_Ë®g¡÷h_Ë®=1.0¡Á10³kg/m³¡Á10N/kg¡Á20m=2¡Á10⁵Pa£»
£¨3£©Õ¢ÃÅÖмäËùÊÜË®µÄƽ¾ùѹǿ£ºp¡ä=p_ÉÏÖÐ=¦Ñ_Ë®g¡Á$\frac{1}{2}$h_Õ¢ÃÅ=1.0¡Á10³kg/m³¡Á10N/kg¡Á$\frac{1}{2}$¡Á40m=2¡Á10⁵Pa£»
Õ¢ÃÅÊÜÁ¦Ãæ»ý£º
S=40m¡Á20m=800m²£¬
ÓÉp=$\frac{F}{S}$µÃ£º
ÕâÉÈÕ¢ÃÅËùÊÜË®µÄѹÁ¦F=p¡äS=2¡Á10⁵Pa¡Á800m²=1.6¡Á10⁸N£®
´ð£º£¨1£©ÆäÖÐÒ»ÉÈÊ×¼¶ÈË×ÖÕ¢ÃŵÄÖÊÁ¿ÊÇ1.92¡Á10⁷kg£»
£¨2£©ÂÖ´¬Í¨¹ýÊ×¼¶Õ¢ÊҵĹý³ÌÖУ¬Õ¢Êҵײ¿Êܵ½Ë®µÄѹǿ¼õÉÙÁË2¡Á10⁵Pa£»
£¨3£©Ò»ÉÈÊ×¼¶ÉÏÓÐÕ¢ÃÅÃæ¶ÔÉÏÓÎˮλµÄÒ»ÃæÊܵ½µÄË®µÄѹÁ¦´óÔ¼ÊÇ1.6¡Á10⁸N£®

µãÆÀ ±¾Ìâ×ۺϿ¼²éÁËѧÉú¶Ôѹǿ¶¨ÒåʽºÍÒºÌåѹǿ¹«Ê½µÄÕÆÎÕºÍÔËÓã¬ÄÜÕÒ³öË®ÉîhÊDZ¾ÌâµÄ¹Ø¼ü£»×¢ÒâѹǿµÄ±ä»¯ÊÇÓÐÒºÌå¸ß¶ÈµÄ±ä»¯ÒýÆðµÄ£¬ÓÉ¡÷p_µ×=¦Ñ_Ë®g¡÷h_Ë®¼ÆËã¸ü¼ò±ã£®