3£®Ð¡ÑôѧϰÁËÎïÀíÖ®ºó¾­³£ÀûÓÿÎÍâ»î¶¯Ê±¼äµ½ÊµÑéÊÒ×öʵÑ飮Ëû´Ó¼ÒÀï´øÀ´Ò»¸öÍÁ¶¹£¬²âµÃÌå»ýΪ50cm3£®Ð¡Ñô½«ËüÇáÇáµØ·ÅÈëÊ¢ÂúÑÎË®µÄÉÕ±­ÖУ¬·¢ÇòÍÁ¶¹Æ¯¸¡ÔÚÒºÃæÉÏ£¬Í¬Ê±ÓÐÑÎË®´ÓÉÕ±­ÖÐÒç³ö£¬Ëû²âµÃÒç³öÑÎË®µÄÖÊÁ¿Îª54g£®È¡g=10N/kg£®Çó£º
£¨1£©ÍÁ¶¹Êܵ½µÄ¸¡Á¦¶à´ó£¿
£¨2£©ÍÁ¶¹µÄÖÊÁ¿¶à´ó£¿
£¨3£©ÍÁ¶¹µÄÃܶȶà´ó£¿
£¨4£©ÒªÏëʹÍÁ¶¹Ï³Á£¬Äã¿ÉÒÔ²Éȡʲô·½·¨£¬²¢ËµÃ÷ÕâÑù×öµÄÀíÓÉ£®

·ÖÎö £¨1£©ÖªµÀÍÁ¶¹Òç³öÑÎË®µÄÖØÁ¦¼´ÎªÅÅ¿ªÑÎË®µÄÖØÁ¦£¬¸ù¾Ý°¢»ùÃ×µÂÔ­ÀíºÍG=mgÇó³öÍÁ¶¹Êܵ½µÄ¸¡Á¦£»
£¨2£©ÍÁ¶¹Æ¯¸¡Ê±Êܵ½µÄ¸¡Á¦ºÍ×ÔÉíµÄÖØÁ¦ÏàµÈ£¬¸ù¾ÝG=mgÇó³öÍÁ¶¹µÄÖÊÁ¿£»
£¨3£©ÖªµÀÍÁ¶¹µÄÌå»ýºÍÖÊÁ¿£¬¸ù¾Ý¦Ñ=$\frac{m}{V}$Çó³öÍÁ¶¹µÄÃܶȣ»
£¨4£©¸ù¾ÝÎïÌåµÄÃܶȴóÓÚÒºÌåÃܶÈʱÎïÌåϳÁ½øÐнâ´ð£®

½â´ð ½â£º£¨1£©ÓÉ°¢»ùÃ×µÂÔ­Àí¿ÉµÃ£¬ÍÁ¶¹Êܵ½µÄ¸¡Á¦£º
F¸¡=GÅÅ=GÒç³ö=mÒç³ög=54¡Á10-3kg¡Á10N/kg=0.54N£»
£¨2£©ÒòÍÁ¶¹Æ¯¸¡Ê±Êܵ½µÄ¸¡Á¦ºÍ×ÔÉíµÄÖØÁ¦ÏàµÈ£¬
ËùÒÔ£¬ÍÁ¶¹Êܵ½µÄÖØÁ¦£º
G=F¸¡=0.54N£¬
ÓÉG=mg¿ÉµÃ£¬ÍÁ¶¹µÄÖÊÁ¿£º
m=$\frac{G}{g}$=$\frac{0.54N}{10N/kg}$=0.054kg=54g£»
£¨3£©ÍÁ¶¹µÄÃܶȣº
¦Ñ=$\frac{m}{V}$=$\frac{54g}{50c{m}^{3}}$=1.08g/cm3£»
£¨4£©ÒòÎïÌåµÄÃܶȴóÓÚÒºÌåÃܶÈʱÎïÌåϳÁ£¬
ËùÒÔ£¬ÏòÉÕ±­ÖмÓÇåˮϡÊÍÑÎˮֱÖÁÑÎË®µÄÃܶÈСÓÚÍÁ¶¹µÄÃܶÈʱ£¬ÍÁ¶¹Ï³Á£®
´ð£º£¨1£©ÍÁ¶¹Êܵ½µÄ¸¡Á¦Îª0.54N£»
£¨2£©ÍÁ¶¹µÄÖÊÁ¿Îª54g£»
£¨3£©ÍÁ¶¹µÄÃܶÈΪ1.08g/cm3£»
£¨4£©ÏòÑÎË®ÖмÓÇåË®£»ÀíÓÉ£ºÎïÌåµÄÃܶȴóÓÚÒºÌåµÄÃܶÈʱÎïÌåÔÚÒºÌåÖÐϳÁ£®

µãÆÀ ±¾Ì⿼²éÁË°¢»ùÃ×µÂÔ­Àí¡¢ÎïÌ帡³ÁÌõ¼þ¡¢Ãܶȹ«Ê½µÄÓ¦Ó㬼ÆËã¹ý³ÌҪעÒⵥλµÄ»»ËãºÍͳһ£®

Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

13£®ÈçͼËùʾµÄÑïÉùÆ÷µÄ¹¹ÔìʾÒâͼ£¬µ±ÏßȦÓɵçÁ÷ͨ¹ýʱ£¬ÏßȦÊÜÁ¦µÄ×÷ÓôӶø´ø¶¯×¶ÐÎÖ½ºÐÕñ¶¯£¬²úÉúÉùÒô£®ÏÂÁÐÉ豸ÓëÑïÉùÆ÷Ô­ÀíÏàͬµÄÊÇ£¨¡¡¡¡£©
A£®µç´ÅÆðÖØ»úB£®µç·¹¹øC£®µç¶¯»úD£®·¢µç»ú

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£º½â´ðÌâ

14£®ÔÚÈçͼÖУ¬ÖØΪ2Å£µÄСÇò±£³Ö¾²Ö¹£¬ÓÃÁ¦µÄͼʾ·¨»­³öСÇòËùÊܵÄÖØÁ¦G£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£º¶àÑ¡Ìâ

11£®¹ØÓÚµçÁ÷¸úµçѹºÍµç×è¹Øϵ£¬ÏÂÁÐ˵·¨ÖÐÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£®µç×èÔ½´ó£¬µçÁ÷ԽС£»µçѹԽ´ó£¬µçÁ÷Ô½´ó
B£®µ¼ÌåÁ½¶ËµÄµçѹԽ¸ß£¬Í¨¹ýÕâ¶Îµ¼ÌåµÄµçÁ÷¾ÍÔ½´ó
C£®ÔÚµçѹ²»±äµÄÇé¿öÏ£¬µ¼ÌåÖеĵçÁ÷Ô½´ó£¬µ¼ÌåµÄµç×èԽС
D£®ÔÚµçѹһ¶¨µÄÇé¿öÏ£¬µ¼Ìåµç×èԽС£¬µçÁ÷¾ÍÔ½´ó

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

18£®ÏÂÁÐÓйعâÏÖÏóµÄ˵·¨ÖУ¬ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£®
С¿×³ÉÏñÊǹâµÄÖ±Ïß´«²¥ÐγɵÄ
B£®
ºÚ°åÓҶ˷´¹âÊÇÓÉÓÚ¹âµÄÂþ·´ÉäÐγɵÄ
C£®
¡°º£ÊÐò×Â¥¡±ÊÇÓÉÓÚ¹âµÄ·´Éä¶øÐγɵÄ
D£®
ÕÕÏà»úÐγɵÄÏñÊǵ¹Á¢¡¢ËõСµÄÐéÏñ

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£º½â´ðÌâ

4£®Ì½¾¿¡°²¢Áªµç·µçÁ÷¹æÂÉ¡±£¬
£¨1£©Ð¡ºìͬѧÉè¼ÆµÄ·½°¸ÊÇ£º£¨a£©°´×ŵç·ͼÁ¬½ÓºÃµç·£®£¨b£©°ÑµçÁ÷±í·Ö±ð·ÅÔÚA¡¢B¡¢CÈý´¦²âµçÁ÷²¢ÌîÈëÏÂ±í£®£¨c£©¸ù¾ÝÊý¾ÝµÃ³ö½áÂÛ£º²¢Áªµç·¸É·µçÁ÷µÈÓÚ¸÷֧·µçÁ÷Ö®ºÍ£®
 I1/A I2/A I/A
 0.2 0.4 0.6
СºìµÄʵÑé·½°¸ÓÐʲô²»Í×Ö®´¦£¿Ìá³öÒ»¸ö¸Ä½ø·½·¨¸ü»»²»Í¬¹æ¸ñµÄСµÆÅÝ£¬¶à²â¼¸×éÊý¾Ý£¬·ÖÎö¹éÄɵóö½áÂÛ£®
£¨2£©ÊµÑéÖУ¬¹Û²ìµ½µÆÅÝL1±ÈµÆÅÝL2°µ£®¸ù¾ÝÕâÒ»ÏÖÏó£¬Ð¡ÈÙ×ö³öÒÔÏ·ÖÎö£º¸ù¾ÝP=I2R£¬PÓëR³ÉÕý±È£®L1±ÈL2°µÊÇÒòΪL1µÄµç×èСÓÚL2µÄµç×裮ÇëÄã»Ø´ð£º´Ë·ÖÎöÊÇ·ñÕýÈ·²¢ËµÃ÷ÀíÓÉ£®
£¨3£©ÓÃÒ»¸öµçÁ÷±í¡¢Ò»¸ö×èÖµÒÑÖªµÄµç×èR1£¬²âÁ¿Î´Öªµç×èR2µÄ×èÖµ£®Éè¼ÆµÄµç·Èçͼ2£¬±ÕºÏS¡¢¶Ï¿ªS1ʱ£¬µçÁ÷±íµÄ¶ÁÊýΪI1£»Í¬Ê±±ÕºÏS¡¢S1ʱ£¬µçÁ÷±íµÄ¶ÁÊýΪI2£®ÈôµçÔ´µÄµçѹ²»±ä£¬Ôò´ý²âµç×èR2µÄ×èÖµ±í´ïʽΪR2=$\frac{{I}_{1}{R}_{1}}{{I}_{2}-{I}_{1}}$£¨ÓÃÒѸø³öµÄÎïÀíÁ¿·ûºÅ±íʾ£©£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£º½â´ðÌâ

11£®Ð¡Ã÷ͬѧÔÚ̽¾¿¡°µçÁ÷ͨ¹ýµ¼Ìå²úÉúÈȵĶàÉÙÓëʲôÒòËØÓйء±Ê±²ÉÓÃÁËÈçͼËùʾµÄʵÑé×°Öã®Çë×Ðϸ¹Û²ì¼×¡¢ÒÒÁ½Í¼£®
£¨1£©ÊµÑéÖÐͨ¹ý¹Û²ìÁ½¸öUÐιÜÖÐÒºÃæ¸ß¶È±ä»¯À´±È½ÏµçÁ÷ͨ¹ýµç×èË¿²úÉúµÄÈÈÁ¿µÄ¶àÉÙ£®
£¨2£©ÄãÈÏΪ¼×ͼËùʾµÄ×°ÖÃÊÇÓÃÀ´Ñо¿µçÁ÷ͨ¹ýµ¼Ìå²úÉúµÄÈÈÁ¿Óëµç×èµÄ¹Øϵ£®
£¨3£©ÓÉÒÒͼËùʾµÄʵÑéÏÖÏó¿ÉÒԵõ½µÄ½áÂÛÊÇ£ºÔÚµç×衢ͨµçʱ¼äÏàͬµÄÇé¿öÏ£¬µçÁ÷Ô½´ó£¬µç×è²úÉúµÄÈÈÁ¿Ô½¶à£®
£¨4£©ÈôÒÒͼÖÐÈÝÆ÷ÍâµÄµç×èÔ¶Ô¶´óÓÚÈÝÆ÷Öеĵç×裬Á½¸öUÐιÜÖÐÒºÃæ¸ß¶ÈµÄ±ä»¯Ïà²î»áС£¨Ñ¡Ìî¡°´ó¡±»ò¡°Ð¡¡±£©£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ

8£®2013Äê4ÔÂ20ÈÕ8ʱ08·ÖËÄ´¨Â«É½·¢Éú7.0¼¶µØÕ𣬵ØÕð·¢Éúºó£¬ÎÒ½â·Å¾üѸËٸϸ°ÔÖÇø£¬¶¯ÓÃÍÚ¾ò»úÍÚÍÁÇÀ¾ÈÈËÔ±£¬ÈôÍÚ¾ò»ú¶·ÈÝΪ0.5Á¢·½Ã×£¬ÒÑÖªÄàÍÁµÄÃܶÈΪ1.3¡Á103kg/m3£¬ÔòÍÚ¾ò»úÍÚÂúÄàÍÁʱÄàÍÁµÄÖÊÁ¿Îª650kg£¬½«ËüÃÇÍÚµ½2Ã׸ߵĵط½£¬ÍÚ¾ò»ú¶ÔÄàÍÁËù×öµÄ¹¦Îª1.3¡Á104J£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ

9£®µç·¹ìÒÊdz£¼ûµÄ¼ÒÓõçÆ÷£¬ËüÊǸù¾ÝµçÁ÷µÄÈÈЧӦ¹¤×÷µÄ£»´Ó°²È«½Ç¶È¿¼ÂÇ£¬µç·¹ìÒӦʹÓÃÈý¿×²å×ù£¬ÕâÑù×öÊÇΪÁËÈÃËüµÄ½ðÊôÍâ¿ÇÓëµØÏßÏàÁ¬£¬·ÀÖ¹´¥µç£®

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸