ÌâÄ¿ÄÚÈÝ

7£®¼×ÒÒÁ½Á¾³µÍ¬Ê±ÔÚÆ½Ö±µÄ¹«Â·ÉÏͬÏòÐÐÊ»£¬ËÙ¶È·Ö±ðΪ4m/sºÍ10m/s£¬µ±ÒÒ³µÔڼ׳µÇ°7m´¦Ê±£¬ÒÒ³µ¿ªÊ¼ÒÔa=2m/s2µÄ¼ÓËÙ¶È¿ªÊ¼×öÔȼõËÙÔ˶¯£¬ÔòÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£®´ÓÒÒ³µ¼õËÙ¿ªÊ¼¼ÆÊ±£¬¼×³µ×·ÉÏÒÒ³µÐèʱ¼ät=8s
B£®´ÓÒÒ³µ¼õËÙ¿ªÊ¼¼ÆÊ±£¬¼×³µ×·ÉÏÒÒ³µÐèʱ¼ät=7s
C£®¼×³µ×·ÉÏÒÒ³µÇ°£¬Á½³µÖ®¼äµÄ×î´ó¾àÀëΪ9m
D£®¼×³µ×·ÉÏÒÒ³µÇ°£¬Á½³µÖ®¼äµÄ×î´ó¾àÀëΪ16m

·ÖÎö ¸ù¾ÝB¼õËÙµÄÆ½¾ùËÙ¶È´óСÅж¨AÔÚB³µÍ£Ö¹ºó×·ÉÏB³µ£¬ÔÙ¸ù¾ÝÎ»ÒÆ¹ØÏµÇó×·ÉÏËùÓÃʱ¼ä£®

½â´ð ½â£ºAB¡¢B¼õËÙÖÁÍ£Ö¹¹ý³ÌÖÐµÄÆ½¾ùËÙ¶È$\overline{v}=\frac{{v}_{B}^{\;}+0}{2}=\frac{10+0}{2}=5m/s£¾{v}_{A}^{\;}$ËùÒÔA³µÔÚB³µÍ£Ö¹Ô˶¯Ç°×·²»ÉÏB³µ£¬
¹ÊBÍ£³µÎ»ÒÆ${x}_{B}^{\;}=\frac{{v}_{B}^{2}}{2a}=\frac{1{0}_{\;}^{2}}{2¡Á2}=25m$
ËùÒÔA³µ×·ÉÏB³µ¹ý³ÌÖвúÉúµÄÎ»ÒÆxA=xB+x=25+7m=32m
ÓÉA³µ×·ÉÏB³µËùÓÃʱ¼ä$t=\frac{{x}_{A}^{\;}}{{v}_{A}^{\;}}=\frac{32}{4}s=8s$£¬¹ÊAÕýÈ·£¬B´íÎó£»
CD¡¢µ±¼×ÒÒËÙ¶ÈÏàµÈʱ¾àÀë×î´ó
${v}_{¼×}^{\;}={v}_{ÒÒ}^{\;}-at$
4=10-2t
½âµÃt=3s
${x}_{ÒÒ}^{\;}=10¡Á3+\frac{1}{2}¡Á£¨-2£©¡Á{3}_{\;}^{2}=21m$
${x}_{¼×}^{\;}=4¡Á3=12m$
×î´ó¾àÀë¡÷x=21+7-12=16m£¬¹ÊC´íÎó£¬DÕýÈ·£»
¹ÊÑ¡£ºAD

µãÆÀ ×¢Òâɲ³µÊ±Æû³µ×öÔȼõËÙÔ˶¯µÄÍ£³µÊ±¼ä£¬²»ÄÜÖ±½Ó¸ù¾ÝABÁ½³µµÄÎ»ÒÆ¹«Ê½Áз½³ÌÇó½â£¬×¢ÒâÅжÏÔÚʲôʱºò×·ÉÏB³µ

Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿
19£®Ä³Í¬Ñ§Òª²âÁ¿Ò»¾ùÔÈвÄÁÏÖÆ³ÉµÄÔ²ÖùÌåµÄµç×èÂʲ½ÖèÈçÏ£º
£¨1£©ÓÃÂÝÐý²â΢Æ÷²âÁ¿ÆäÖ±¾¶Èçͼ2£¬¿ÉÖªÆäÖ±¾¶Îª4.700mm£»
£¨2£©ÓöàÓõç±íµÄµç×è¡°¡Á10¡±µ²£¬°´ÕýÈ·µÄ²Ù×÷²½Öè²â´ËÔ²ÖùÌåµÄµç×裬±íÅ̵ÄʾÊýÈçͼ1£¬Ôò¸Ãµç×èµÄ×èֵԼΪ220¦¸£®

£¨3£©¸ÃͬѧÏëÓ÷ü°²·¨¸ü¾«È·µØ²âÁ¿Æäµç×èR£¬ÏÖÓÐµÄÆ÷²Ä¼°Æä´úºÅºÍ¹æ¸ñÈçÏ£º
´ý²âÔ²ÖùÌåµç×èR
µçÁ÷±íA1£¨Á¿³Ì0¡«3mA£¬ÄÚ×èÔ¼50¦¸£©
µçÁ÷±íA2£¨Á¿³Ì0¡«10mA£¬ÄÚ×èÔ¼30¦¸£©
µçѹ±íV1£¨Á¿³Ì0¡«3V£¬ÄÚ×èÔ¼10k¦¸£©
µçѹ±íV2£¨Á¿³Ì0¡«15V£¬ÄÚ×èÔ¼25k¦¸£©
Ö±Á÷µçÔ´E£¨µç¶¯ÊÆ3V£¬ÄÚ×è²»¼Æ£©
»¬¶¯±ä×èÆ÷R1£¨×èÖµ·¶Î§0¡«15¦¸£¬ÔÊÐíͨ¹ýµÄ×î´óµçÁ÷2.0A£©
»¬¶¯±ä×èÆ÷R2£¨×èÖµ·¶Î§0¡«2k¦¸£¬ÔÊÐíͨ¹ýµÄ×î´óµçÁ÷0.5A£©
¿ª¹ØS¡¢µ¼ÏßÈô¸É£®
ΪʹʵÑéÎó²î½ÏС£¬ÒªÇó±ãÓÚµ÷½ÚÇÒ²âµÃ¶à×éÊý¾Ý½øÐзÖÎö£¬ËùÑ¡µçÁ÷±íA2£»µçѹ±íV1£»»¬¶¯±ä×èÆ÷R1£¨ÌîËùÑ¡Æ÷²ÄµÄ·ûºÅ£©£¬²¢ÔÚͼ3¿òÖл­³ö²âÁ¿µÄµç·ͼ£®

£¨4£©Èç¹ûʵÑéÖеçÁ÷±íʾÊýΪI£¬µçѹ±íʾÊýΪU£¬²¢²â³ö¸Ã°ôµÄ³¤¶ÈΪL¡¢Ö±¾¶Îªd£¬Ôò¸Ã²ÄÁϵĵç×èÂʦÑ=$\frac{¦ÐU{d}^{2}}{4IL}$£¨Óòâ³öµÄÎïÀíÁ¿µÄ·ûºÅ±íʾ£©£®

Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com

¾«Ó¢¼Ò½ÌÍø