9£®Ð¡»ªÑ§Ï°×ö·¹µÄ¹ý³ÌÖУ¬¾­³£¼ÓÈÈÓͺÍË®£¬Ëý²ÂÏëÓ͵ıÈÈÈÈݱÈˮС£®
£¨1£©ÎªÁËÑéÖ¤²ÂÏ룬С»ªÏòÁ½¸öͬÑùµÄÉÕ±­Àï·Ö±ðµ¹ÈëÏàͬµÄË®ºÍÓÍ£¬²¢²âÁ¿ËüÃǵijõʼζȣ®Á½Î¶ȼÆʾÊýÏàͬ£¬ÈçͼËùʾ£¬ËüÃǵijõʼζÈΪ20¡æ£®
£¨2£©ÔÚͬÑùÌõ¼þϼÓÈÈÏàͬʱ¼äºó£¬Ë®µÄζȴﵽ25¡æ£¬Ó͵Äζȴﵽ30¡æ£¬Óɴ˿ɵÃÓ͵ıÈÈÈÈÝΪ$2.1¡Á1{0}_{\;}^{3}$J/£¨kg•¡æ£©[Ë®µÄ±ÈÈÈÈÝΪ4.2¡Á103 J/£¨kg•¡æ£©]£®

·ÖÎö £¨1£©±È½ÏÎïÖʵÄÎüÈÈÄÜÁ¦ÓÐÁ½ÖÖ·½·¨£º¿ØÖÆËüÃǵÄÖÊÁ¿ºÍÎüÈȶàÉÙÏàͬ£¬±È½ÏËüÃÇÉý¸ßµÄζȣ¬±È½ÏËüÃÇÎüÈȶàÉÙ£®Î¶ȼƶÁÊýÒªÏÈÅжÏÁãÉÏ»¹ÊÇÁãÏ£¬¶ÁÊýʱ£¬ÊÓÏߺÍÒºÖùÉϱíÃæÏàƽ£»
£¨2£©ÏàͬÌõ¼þ¼ÓÈÈÏàͬʱ¼ä£¬±íʾˮºÍÓÍÎüÊÕµÄÈÈÁ¿Ïàͬ£¬Ë®µÄ±ÈÈÈÈÝÊÇÒÑÖªµÄ£¬¸ù¾Ý¹«Ê½${c}_{Ë®}^{\;}{m}_{Ë®}^{\;}£¨{t}_{Ë®}^{\;}-{t}_{0}^{\;}£©={c}_{ÓÍ}^{\;}{m}_{ÓÍ}^{\;}£¨{t}_{ÓÍ}^{\;}-{t}_{0}^{\;}£©$

½â´ð ½â£º£¨1£©ÖÊÁ¿ÏàͬµÄÓͺÍË®£¬ÓÃͬһÈÈÔ´¼ÓÈÈÏàͬµÄʱ¼ä£¬¿ÉÒÔ±£Ö¤²»Í¬ÒºÌåÎüÊÕµÄÈÈÁ¿ÏàµÈ£»ÓÉͼ֪£¬ÊýÖµÏòÉÏÊÇÔö´óµÄ£¬ÏÖÔÚÊÇÁãÉϵÄζȣ¬ËùÒÔËüÃǵijõʼζÈΪ20¡æ
£¨2£©ÒòΪ${Q}_{Ë®Îü}^{\;}={Q}_{ÓÍÎü}^{\;}$
ËùÒÔ${c}_{Ë®}^{\;}{m}_{Ë®}^{\;}£¨{t}_{Ë®}^{\;}-{t}_{0}^{\;}£©$=${c}_{ÓÍ}^{\;}{m}_{ÓÍ}^{\;}£¨{t}_{ÓÍ}^{\;}-{t}_{0}^{\;}£©$
´úÈëÊý¾ÝµÃ£¬$4.2¡Á1{0}_{\;}^{3}¡Á{m}_{Ë®}^{\;}¡Á£¨25-20£©$=${c}_{ÓÍ}^{\;}{m}_{ÓÍ}^{\;}¡Á£¨30-20£©$
ÆäÖÐ${m}_{Ë®}^{\;}={m}_{ÓÍ}^{\;}$
½âµÃ£º${c}_{ÓÍ}^{\;}=2.1¡Á1{0}_{\;}^{3}$J/£¨kg•¡æ£©
¹Ê´ð°¸Îª£º£¨1£©20        £¨2£©$2.1¡Á1{0}_{\;}^{3}$

µãÆÀ ±ÈÈÈÈÝÃèÊöµÄÊÇÎïÖʵÄÎüÈȱ¾Á죬±È½Ï±ÈÈÈÈݵĴóСʱ£¬ÒªÔÚÎüÊÕÏàͬµÄÈÈÁ¿Ê±£¬±Èζȵı仯Á¿£»»òÔÚζȱ仯Ïàͬʱ£¬±È½ÏÎüÊÕµÄÈÈÁ¿µÄ¶àÉÙ£¬Òª×¢Òâ¿ØÖƱäÁ¿Ë¼ÏëµÄÌåÏÖ£®

Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÊµÑéÌâ

19£®£¨1£©Ä³Í¬Ñ§ÔÚÓÃÓÍĤ·¨¹À²â·Ö×ÓÖ±¾¶ÊµÑéÖУ¬¼ÆËã½á¹ûÃ÷ÏÔÆ«´ó£¬¿ÉÄÜÊÇÓÉÓÚAC£®
A£®ÓÍËáδÍêÈ«É¢¿ª
B£®ÓÍËáÖк¬ÓдóÁ¿µÄ¾Æ¾«
C£®¼ÆËãÓÍĤÃæ»ýʱÉáÈ¥ÁËËùÓв»×ãÒ»¸ñµÄ·½¸ñ
D£®ÇóÿµÎÌå»ýʱ£¬Îó½«1mLµÄÈÜÒºµÄµÎÊý¶à¼ÇÁË10 µÎ
£¨2£©ÔÚ×ö¡°ÓÃÓÍĤ·¨¹À²â·Ö×Ó´óС¡±µÄʵÑéÖУ¬½«4mLµÄ´¿ÓÍËáÈÜÒºµÎÈë20LÎÞË®¾Æ¾«ÈÜÒºÖгä·Ö»ìºÏ£®×¢ÉäÆ÷ÖÐ1mLµÄÉÏÊö»ìºÏÈÜÒº¿É·Ö50 µÎ¾ùÔȵγö£¬½«ÆäÖеÄ1 µÎµÎÈëʢˮµÄdzÅÌÀ´ýË®ÃæÎȶ¨ºó£¬½«²£Á§°å·ÅÔÚdzÅÌÉÏ£¬ÔÚ²£Á§°åÉÏÃè³öÓÍĤµÄÂÖÀª£¬Ëæºó°Ñ²£Á§°å·ÅÔÚ×ø±êÖ½ÉÏ£¬ÆäÐÎ×´ÈçͼËùʾ£¬×ø±êÖ½ÉÏÕý·½ÐÎС·½¸ñµÄ±ß³¤Îª1cm£®ÊÔ½â´ðÏÂÁÐÎÊÌ⣺
£¨ÒÔϽá¹û¾ùȡһλÓÐЧÊý×Ö£©
¢ÙÓÍËáĤµÄÃæ»ýÊÇ8¡Á10-3m2£»
¢ÚÿһµÎÓÍËá¾Æ¾«ÈÜÒºÖк¬Óд¿ÓÍËáµÄÌå»ýÊÇ4¡Á10-6mL£»
¢Û¸ù¾ÝÉÏÊöÊý¾Ý£¬¹À²â³öÓÍËá·Ö×ÓµÄÖ±¾¶ÊÇ5¡Á10-10m£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÊµÑéÌâ

20£®ÔÚ×ö¡°Ñо¿Æ½Å×ÎïÌåµÄÔ˶¯¡±µÄʵÑéÖУ¬ÎªÁËÈ·¶¨Ð¡ÇòÔÚ²»Í¬Ê±¿ÌÔÚ¿ÕÖÐËùͨ¹ýµÄλÖã¬ÊµÑéʱÓÃÁËÈçͼËùʾµÄ×°Öã®ÏȽ«Ð±²ÛÄ©¶Ëµ÷Õûˮƽ£¬ÔÚÒ»¿éƽÕûµÄľ°å±íÃ涤ÉÏ°×Ö½ºÍ¸´Ð´Ö½£®½«¸Ãľ°åÊúÖ±Á¢ÓÚˮƽµØÃ棬²¢´¹Ö±ÓÚб²ÛÄ©¶Ë²¿·ÖËùÔÚÖ±Ïߣ»Ê¹Ð¡Çò´Óб²ÛÉϽô¿¿µ²°å´¦Óɾ²Ö¹ÊÍ·Å£¬Ð¡Çòײµ½Ä¾°åÉϲ¢ÔÚ°×Ö½ÉÏÁôϺۼ£A£»½«Ä¾°åÏòÔ¶Àë²Û¿ÚƽÒÆÒ»¶Î¾àÀëx£¬ÔÙʹСÇò´Óб²ÛÉϽô¿¿µ²°å´¦Óɾ²Ö¹ÊÍ·Å£¬Ð¡Çòײµ½Ä¾°åÉϵõ½ºÛ¼£B£»ÓÖ½«Ä¾°åÏòÔ¶Àë²Û¿ÚƽÒÆÒ»¶Î¾àÀëx£¬Ð¡ÇòÔÙ´Óб²ÛÉϽô¿¿µ²°å´¦Óɾ²Ö¹ÊÍ·Å£¬Ð¡Çòײµ½Ä¾°åÉϵõ½ºÛ¼£C£®Èô²âµÃľ°åÿ´ÎÒƶ¯µÄ¾àÀëx=15.00cm£¬A¡¢B¼äµÄ¾àÀëy1=15.00cm£¬B¡¢C¼äµÄ¾àÀëy2=25.00cm£®£¨gÈ¡10m/s2£©£®»Ø´ðÏÂÁÐÎÊÌ⣺
£¨1£©ÊµÑéÖÐÏÂÁÐ˵·¨ÕýÈ·µÄÊÇBC£¨ÌîÑ¡ÏîÇ°µÄ×Öĸ´úºÅ£©
A£®Ð¡Çòÿ´Î±ØÐë´ÓͬһλÖÃÓɾ²Ö¹¹öÏ£¬ÊÇΪÁ˱£Ö¤Ã¿´ÎСÇòÔÚ¿ÕÖÐÔ˶¯µÄʱ¼äÏàµÈ
B£®Ä¾°åÿ´ÎÏòÓÒÒƶ¯µÄ¾àÀëxÏàµÈÊÇΪÁ˱£Ö¤ÏàÁÚÁ½µã¼äµÄʱ¼ä¼ä¸ôÏàµÈ
C£®Ä¾°åÒƶ¯ºó±ØÐëÊúÖ±ÇÒ´¹Ö±ÓÚб²Û¹ìµÀÄ©¶Ë²¿·ÖËùÔÚÖ±Ïß
D£®Ð±²Û¹ìµÀ±ØÐë¹â»¬
£¨2£©Èç¹û±¾ÊµÑéÖн¨Á¢Ö±½Ç×ø±êϵ£¬×ø±êÔ­µãOÒÔ²Û¿ÚÄ©¶ËΪ×ø±êÔ­µãʱ£¬¼ÆËãƽÅ×Ô˶¯µÄ³õËÙ¶Èʱ½«Ê¹²âÁ¿½á¹û²»±ä£¨Ìî¡°Æ«´ó¡±¡¢¡°Æ«Ð¡¡±¡¢¡°²»±ä¡±»ò¡°ÎÞ·¨È·¶¨¡±£©£®
£¨3£©¸ù¾ÝÒÔÉÏÖ±½Ó²âµÃµÄÎïÀíÀíÀ´ÇóµÃСÇò³õËٶȵıí´ïʽΪv0=x$\sqrt{\frac{g}{{y}_{2}-{y}_{1}}}$£¨ÓÃÌâÖÐËù¸ø×Öĸ±íʾ£©£¬Ð¡ÇòµÄ³õËٶȵÄֵΪv0=1.5m/s£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

17£®ÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£®ÇâÔ­×Ó´Ó¼¤·¢Ì¬Ïò»ù̬ԾǨֻÄÜ·øÉäÌض¨ÆµÂʵĹâ×Ó
B£®Ô­×Ӻ˷¢ÉúË¥±äʱҪ×ñÊصçºÉÊغãºÍÖÊÁ¿ÊغãµÄ¹æÂÉ
C£®·¢Éú¹âµçЧӦʱ¹âµç×ӵĶ¯ÄÜÖ»ÓëÈëÉä¹âµÄÇ¿¶ÈÓйØ
D£®¦ÁÉäÏß¡¢¦ÂÉäÏß¡¢¦ÃÉäÏ߶¼ÊǸßËÙÔ˶¯µÄ´øµçÁ£×ÓÁ÷

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

4£®·¢µç»úºÍµç¶¯»úµÄÏà¼ÌÎÊÊÀ£¬Ê¹µçÄܵĴó¹æÄ£Éú²úºÍÀûÓóÉΪÏÖʵ£¬ÈçͼËùʾËÄ·ùͼÖÐÊôÓÚµç´Å¸ÐÓ¦ÏÖÏóÓ¦ÓõÄÊÇ£¨¡¡¡¡£©
A£®B£®
C£®D£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º¶àÑ¡Ìâ

14£®¹ØÓÚµÈÊÆÃ棬ÕýÈ·µÄ˵·¨ÊÇ£¨¡¡¡¡£©
A£®Á½µÈÊÆÃæ²»ÄÜÏཻ
B£®µÈÊÆÃæÉϸ÷µãµÄ³¡Ç¿´óСÏàµÈ
C£®µÈÊÆÃæÒ»¶¨¸úµç³¡Ïß´¹Ö±
D£®µçºÉÔÚµÈÊÆÃæÉÏÒƶ¯Ê±²»Êܵ糡Á¦×÷Óã¬ËùÒÔ²»×ö¹¦

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º¶àÑ¡Ìâ

1£®¹ØÓÚλÒƺÍ·³Ì£¬ÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£®ÖʵãµÄÊÇ·³ÌʸÁ¿£¬Î»ÒÆÊDZêÁ¿
B£®Öʵãͨ¹ýµÄ·³Ì¿ÉÒÔ²»µÈ£¬µ«Î»ÒÆ¿ÉÄÜÏàͬ
C£®Öʵãͨ¹ýµÄ·³Ì²»ÎªÁ㣬µ«Î»ÒÆ¿ÉÄÜÊÇÁã
D£®Öʵã×öÖ±ÏßÔ˶¯Ê±£¬Ëüͨ¹ýµÄ·³Ì¾ÍÊÇλÒÆ´óС

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

18£®¹ØÓÚÔ˶¯Ñ§µÄÀúÊ·ºÍ¸ÅÄÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£®Ù¤ÀûÂÔͨ¹ý¶ÔµõµÆµÄ¹Û²ì£¬·¢ÏÖÁ˵õµÆ°Ú¶¯µÄµÈʱÐÔ£¬²¢·¢Ã÷ÁË°ÚÖÓ
B£®Ù¤ÀûÂÔÈÏΪ¿ÕÖÐÏÂÂäµÄÎïÌ壬ÖصıÈÇáµÄÏÂÂä¿ì
C£®Öʵ㡢×ÔÓÉÂäÌåÔ˶¯¶¼ÊÇÀíÏ뻯ģÐÍ
D£®Ñо¿ÎïÌåÔ˶¯Ö»ÄÜÒÔµØÃæΪ²Î¿¼Ïµ

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÊµÑéÌâ

19£®ÈçͼΪÑéÖ¤»úеÄÜÊغ㶨ÂɵÄʵÑé×°ÖÃʾÒâͼ£®ÏÖÓеÄÆ÷²Ä£º´øÌú¼ÐµÄÌú¼Ų̈¡¢µç»ð»¨´òµã¼ÆʱÆ÷¡¢Ö½´ø¡¢´ø¼Ð×ÓµÄÖØ´¸¡¢Ììƽ£®»Ø´ðÏÂÁÐÎÊÌ⣺
£¨1£©ÎªÍê³É´ËʵÑ飬³ýÁËËù¸øµÄÆ÷²Ä£¬»¹ÐèÒªµÄÆ÷²ÄÓÐAD£®£¨ÌîÈëÕýÈ·Ñ¡ÏîÇ°µÄ×Öĸ£©
A£®ºÁÃ׿̶ȳß
B£®Ãë±í
C.0¡«12VµÄ¿Éµ÷½ÚÖ±Á÷µçÔ´
D.0¡«220VµÄ¿Éµ÷½Ú½»Á÷µçÔ´
£¨2£©Óôòµã¼ÆʱÆ÷´ò³öÒ»ÌõÖ½´ø£¬Ç°ºóÒªÁ¬Ðø½øÐÐһϵÁеIJÙ×÷£¬ÄãÈÏΪÐèÒª²¢ºÏÀíµÄ²½ÖèÊÇBADC£®£¨Ñ¡³öÏÂÁм¸µãÖÐÐèÒªµÄ×Öĸºó°´ºÏÀí˳ÐòÅÅÁУ©
A£®ÊÍ·ÅÖ½´ø   B£®½ÓͨµçÔ´
C£®È¡ÏÂÖ½´ø    D£®ÇжϵçÔ´
£¨3£©ÊÍ·ÅÖ½´øÇ°µÄ˲¼ä£¬ÖØ´¸ºÍÊÖµÄλÖúÏÀíµÄÊDZû£®£¨Ìî¡°¼×¡±¡¢¡°ÒÒ¡±»ò¡°±û¡±£©
£¨4£©ÏÂÁÐËù˵µÄʵÑéÖÐÉæ¼°µÄ´¦Àí·½·¨»òʵÑé½á¹û£¬ÆäÖÐÕýÈ·µÄÊÇAE£®
A£®¸ÃʵÑéÖм´Ê¹²»ÓÃÌìƽ²âÖØ´¸µÄÖÊÁ¿£¬Í¬ÑùÒ²¿ÉÒÔÑéÖ¤»úеÄÜÊغ㶨ÂÉ
B£®¸ÃʵÑéÑ¡È¡µÄÖ½´ø£¬²âÁ¿·¢ÏÖËù´òµÄµÚÒ»ºÍµÚ¶þµã¼äµÄ¾àÀëÔ¼1.7mm£¬±íÃ÷´òµã¼ÆʱÆ÷´òµÚÒ»µãʱÖØ´¸µÄËٶȲ»ÎªÁã
C£®±¾ÊµÑéÖÐÐèÒªÖ±½Ó²âÁ¿µÃµ½µÄÎïÀíÁ¿ÊÇÖØ´¸ÏÂÂäµÄ¸ß¶È£¬Í¨¹ý¼ÆËãµÃµ½µÄÊǵ±µØµÄÖØÁ¦¼ÓËÙ¶ÈÖµºÍËÙ¶ÈÖµ
D£®ÎªÁ˼ÆËã·½±ã£¬±¾ÊµÑéÖÐÏÈÑ¡Ò»Ìõ´òµã¼ÆʱÆ÷´òµÚÒ»µãʱÖØ´¸µÄËÙ¶ÈΪÁãµÄÇåÎúÖ½´ø£¬È»ºóͨ¹ý¶ÔÖ½´øµÄ²âÁ¿¡¢·ÖÎö£¬Çó³öµ±µØµÄÖØÁ¦¼ÓËٶȵÄÖµ£¬ÔÙ´úÈë±í´ïʽ£ºmgh=$\frac{1}{2}$mv2½øÐÐÑéÖ¤
E£®±¾ÊµÑéÖУ¬ÊµÑé²Ù×÷·Ç³£¹æ·¶£¬Êý¾Ý´¦Àí×ã¹»¾«È·£¬ÊµÑé½á¹ûÒ»¶¨ÊÇmghÂÔ´óÓÚ$\frac{1}{2}$mv2£¬²»¿ÉÄܳöÏÖ$\frac{1}{2}$mv2ÂÔ´óÓÚmgh£®

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸