3£®ÈçͼËùʾ£¬Ò»Ô²ÖùÐξøÈÈÈÝÆ÷ÊúÖ±·ÅÖã¬Í¨¹ý¾øÈÈ»îÈû·â±Õ×Å27¡æÀíÏëÆøÌ壬»îÈûµÄÖÊÁ¿Îªm0£¬ºá½ØÃæ»ýΪS£»ÖÊÁ¿Îª2m0µÄһɳͰ£¨ÀïÃæûÓÐɳ£©Í¨¹ýϸÉþÓë»îÈûÏàÁ¬£¬µ±»îÈû´¦ÓÚ¾²Ö¹×´Ì¬Ê±£¬»îÈûÓëÈÝÆ÷µ×²¿Ïà¾àh0£¬ÒÑÖª´óÆøѹǿΪP0£¬ÖØÁ¦¼ÓËÙ¶ÈΪg£¬
Ç󣺣¨¢ñ£©ÀíÏëÆøÌåµÄѹǿp£»
£¨¢ò£©Í¨¹ýµçÈÈË¿»ºÂý¸øÆøÌå¼ÓÈÈÒ»¶Îʱ¼ä£¬Ê¹»îÈû»ºÂýÒƶ¯£¬ÇÒʹÀíÏëÆøÌåµÄζÈÉÏÉýµ½77¡æ£»ÔÙ±£³ÖÀíÏëÆøÌåµÄζȲ»±ä£¬²»Í£µØÏòɳͰÖмÓɳ×Ó£¬Ê¹»îÈû»ºÂýÒƶ¯£¬µ±É³×Ó¡¢Í°µÄÖÊÁ¿ºÍΪ4m0ʱ£¬»îÈûÀëÈÝÆ÷µ×²¿µÄ¸ß¶È£®

·ÖÎö £¨1£©¸ù¾ÝƽºâÌõ¼þÇó³ö·â±ÕÆøÌåµÄѹǿ
£¨2£©ÆøÌåÏȾ­¹ýµÈÈݱ仯ÔÙ¾­¹ýµÈα仯£¬·Ö±ðÔËÓòéÀí¶¨ÂɺͲ£Òâ¶ú¶¨ÂÉÁÐʽÇó½â

½â´ð ½â£º£¨¢ñ£©ÒÔ»îÈûΪÑо¿¶ÔÏ󣬽øÐÐÊÜÁ¦·ÖÎö£¬»îÈûÊÜÏòÉϵÄÀ­Á¦F¡¢ÖØÁ¦${m}_{0}^{\;}g$¡¢ÏòϵĴóÆøѹÁ¦${p}_{0}^{\;}S$¡¢·â±ÕÆøÌåÏòÉϵÄѹÁ¦pS£¬¸ù¾ÝƽºâÓÐ
$F+pS={p}_{0}^{\;}S+{m}_{0}^{\;}g$
¶ÔɳͰ£º$F=2{m}_{0}^{\;}g$
ÁªÁ¢¿ÉµÃ$£¨{p}_{0}^{\;}-p£©S=£¨2{m}_{0}^{\;}-{m}_{0}^{\;}£©g$
½âµÃ£º$p={p}_{0}^{\;}-\frac{{m}_{0}^{\;}g}{S}$
£¨¢ò£©¾Ý¸Ç-ÂÀÈø¿Ë¶¨ÂɿɵÃ$\frac{S{h}_{0}^{\;}}{273+{t}_{1}^{\;}}=\frac{S{h}_{1}^{\;}}{273+{t}_{2}^{\;}}$
¸ù¾Ý²£Òâ¶ú¶¨ÂɿɵÃ$pS{h}_{1}^{\;}=[{p}_{0}^{\;}-\frac{£¨4{m}_{0}^{\;}-{m}_{0}^{\;}£©g}{S}]S{h}_{2}^{\;}$
½âµÃ£º${h}_{2}^{\;}=\frac{7£¨{p}_{0}^{\;}S-mg£©{h}_{0}^{\;}}{6£¨{p}_{0}^{\;}S-3{m}_{0}^{\;}g£©}$
´ð£º£¨¢ñ£©ÀíÏëÆøÌåµÄѹǿpΪ${p}_{0}^{\;}-\frac{{m}_{0}^{\;}g}{S}$£»
£¨¢ò£©»îÈûÀëÈÝÆ÷µ×²¿µÄ¸ß¶ÈΪ$\frac{7£¨{p}_{0}^{\;}S-mg£©{h}_{0}^{\;}}{6£¨{p}_{0}^{\;}S-3{m}_{0}^{\;}g£©}$£®

µãÆÀ Çó·â±ÕÆøÌåµÄѹǿ£¬³£³£ÒÔÓëÆøÌå½Ó´¥µÄ»îÈû»òË®ÒøÖùΪÑо¿¶ÔÏ󣬸ù¾ÝÁ¦Ñ§ÖªÊ¶Ç󣮶ÔÓÚÆøÌ壬ȷ¶¨×´Ì¬·¢Éú±ä»¯Êǹؼü£®

Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ

13£®±äѹÆ÷ÖÐÓ븺ÔØÁ¬½ÓµÄ½Ð¸±ÏßȦ£¬Óë½»Á÷µçÔ´Á¬½ÓµÄ½ÐÔ­ÏßȦ£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º¼ÆËãÌâ

14£®ÈçͼËùʾ£¬¹â»¬Ë®Æ½×ÀÃæÉÏO´¦ÓÐÒ»¹â»¬µÄÔ²¿×£¬Ò»¸ùÇáÉþÒ»¶ËϵÖÊÁ¿ÎªmµÄСÇò£¬ÁíÒ»¶Ë´©¹ýС¿×Ë©Ò»ÖÊÁ¿ÎªMµÄľ¿é£®µ±mÒÔijһ½ÇËÙ¶ÈÔÚ×ÀÃæÉÏ×÷ÔÈËÙÔ²ÖÜÔ˶¯Ê±£¬Ä¾¿éMÇ¡Äܾ²Ö¹²»¶¯£¬ÕâʱСÇòÔ²ÖÜÔ˶¯µÄ°ë¾¶Îªr£¬Çó´ËʱСÇò×÷ÔÈËÙÔ²ÖÜÔ˶¯µÄ½ÇËÙ¶ÈΪ¶à´ó£¿

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º¼ÆËãÌâ

11£®ÈçͼËùʾ£¬µ¼ÈÈÐÔÄÜÁ¼ºÃµÄÆø¸×¿ª¿ÚÏòÏ£¬ÄÚÓÐÌå»ýΪV0µÄÀíÏëÆøÌ壬Íâ½ç´óÆøѹǿΪp0£¬»·¾³Î¶ÈΪT0£®Çá»îÈûµÄÃæ»ýΪS£¬Çá»îÈûÓëÆø¸×Ö®¼äµÄĦ²Á²»¼Æ£¬ÔÚ»îÈûÏÂÃæ¹ÒÒ»¸öÖÊÁ¿ÎªmµÄСͰ£¬»îÈûÏÂÒÆ£¬²¢´¦ÓÚijһλÖþ²Ö¹²»¶¯£¬ÖØÁ¦¼ÓËÙ¶ÈΪg£¬Çó£º
£¨1£©¹ÒÉÏСͰºó£¬Æø¸×ÄÚµÄÌå»ýV£»
£¨2£©ÄõôСͰ£¬±£³ÖÆø¸×µÄÌå»ýV²»±ä£¬»·¾³Î¶ÈÐèÒªÉý¸ßµ½¶àÉÙ£»²¢ÅжÏÆø¸×ÎüÈÈ»¹ÊÇ·ÅÈÈ£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

18£®ÇâÔ­×ÓÓÉÒ»¸öÖÊ×Ӻ͵ç×Ó×é³É£®¸ù¾Ý¾­µäÄ£ÐÍ£¬µç×ÓÈƺË×öÔ²ÖÜÔ˶¯£¬¹ìµÀ°ë¾¶Îª5.3¡Á10-11m£®ÒÑÖªÖÊ×ÓµÄÖÊÁ¿mp=1.7¡Á10-27kg£¬µç×ÓµÄÖÊÁ¿me=9.1¡Á10-31kg£¬ÍòÓÐÒýÁ¦³£Á¿G=6.7¡Á10-11N•m2/kg2Ôòµç×ÓÊܵ½ÖÊ×ÓµÄÍòÓÐÒýÁ¦´óС×î½Ó½üÏÂÃæµÄÄÄÒ»¸öÊý¾Ý£¨¡¡¡¡£©
A£®4¡Á10-47 NB£®4¡Á10-49NC£®8¡Á10-50 ND£®8¡Á10-44N

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º¶àÑ¡Ìâ

8£®Í¼¼×ΪһÁмòгºá²¨ÔÚt=2sʱµÄ²¨ÐÎͼ£¬Í¼ÒÒΪ½éÖÊÖÐƽºâλÖÃÔÚx=0.75m´¦µÄÖʵãµÄÕñ¶¯Í¼Ïó£¬MÊÇƽºâλÖÃΪx=1mµÄÖʵ㣬ÏÂÁÐ˵·¨ÖÐÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£®²¨µÄ´«²¥·½ÏòÑØxÖḺ·½ÏòB£®0¡«3sʱ¼äÄÚ£¬MÔ˶¯µÄ·³ÌΪ6cm
C£®µ±t=3sʱ£¬MÇ¡ºÃ»Øµ½Æ½ºâλÖÃD£®0¡«1sʱ¼äÄÚ£¬MÏòyÖḺ·½ÏòÔ˶¯
E£®²¨ËÙΪ0.25 m/s   

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

15£®¹ØÓڵ糡ǿ¶È¡¢µçÊÆÄÜ¡¢°²ÅàÁ¦ºÍÂåÂ××ÈÁ¦£¬ÏÂÁеÄ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£®ÓÉÕæ¿ÕÖеãµçºÉµÄµç³¡Ç¿¶È¹«Ê½E=k$\frac{Q}{{r}^{2}}$¿ÉÖª£¬µ±rÇ÷½üÓÚÁãʱ£¬Æäµç³¡Ç¿¶ÈÇ÷½üÓÚÎÞÇî´ó
B£®ÓɵçÊÆÄܵĹ«Ê½Ep=q¦Õ¿ÉÖª£¬Ôڵ糡ÖеÄͬһλÖ㬵çºÉÁ¿Ô½´óµÄµãµçºÉËù¾ßÓеĵçÊÆÄÜÒ²Ô½´ó
C£®ÓÉ°²ÅàÁ¦¹«Ê½F=BIL¿ÉÖª£¬Ò»Ð¡¶Îͨµçµ¼ÌåÔÚij´¦²»ÊÜ°²ÅàÁ¦£¬ËµÃ÷´Ë´¦Ò»¶¨Î޴ų¡
D£®Ò»´øµçÁ£×ÓÔڴų¡ÖÐÔ˶¯Ê±£¬ËùÊÜÂåÂ××ÈÁ¦µÄ·½ÏòÒ»¶¨´¹Ö±ÓڴŸÐӦǿ¶ÈµÄ·½ÏòºÍ´øµçÁ£×ÓµÄÔ˶¯·½Ïò

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

12£®ÔÈÇ¿´Å³¡ÖÐÓÐһͨµçÖ±µ¼Ïߣ¬µçÁ÷IµÄ·½ÏòÈçͼËùʾ£¬Ôò¸Ãµ¼ÏßËùÊÜ°²ÅàÁ¦µÄ·½Ïò£¨¡¡¡¡£©
A£®ÏòÉÏB£®ÏòÏÂC£®´¹Ö±Ö½ÃæÏòÀïD£®´¹Ö±Ö½ÃæÏòÍâ

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º½â´ðÌâ

17£®ÈçͼËùʾ£¬Ò»Ë®³ØÉîΪh£¬Ò»¸ù³¤Ö±Ä¾¹÷¸ËÊúÖ±µØ²åÈëË®µ×£¬¸Ë¶³öË®Ã沿·ÖµÄ³¤¶ÈΪL£¬µ±Ì«Ñô¹âÓëˮƽÃæ¼Ð½ÇΪ30¡ãбÉ䵽ˮÃæʱ£¬Çó¸ËÔÚË®µ×µÄÓ°×ӵij¤¶È²¢»­³ö¹â·ͼ£¨ÒÑ֪ˮµÄÕÛÉäÂÊΪn£©

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸