ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿ÔÚÓÃÖØ´¸ÏÂÂäÀ´ÑéÖ¤»úеÄÜÊغãʱ£¬Ä³Í¬Ñ§°´ÕÕÕýÈ·µÄ²Ù×÷Ñ¡µÃÖ½´øÈçͼËùʾÆäÖÐOÊÇÆðʼµã£¬A¡¢B¡¢C¡¢D¡¢EÊÇ´òµã¼ÆʱÆ÷Á¬Ðø´òϵÄ5¸öµã£¬´òµãƵÂÊΪ
¸ÃͬѧÓúÁÃ׿̶ȳ߲âÁ¿Oµ½A¡¢B¡¢C¡¢D¡¢E¸÷µãµÄ¾àÀ룬²¢¼Ç¼ÔÚͼÖÐ
µ¥Î»£º
£®
ÕâÎå¸öÊý¾ÝÖв»·ûºÏÓÐЧÊý×Ö¶ÁÊýÒªÇóµÄÊÇ________
Ñ¡Ìî¡°A¡±¡°B¡±¡°C¡±¡°D¡±»ò¡°E¡±
µã¶ÁÊý£®
ÈôOµãµ½Ä³¼ÆÊýµã¾àÀëÓÃh±íʾ£¬ÖØÁ¦¼ÓËÙ¶ÈΪg£¬¸Ãµã¶ÔÓ¦ÖØ´¸µÄ˲ʱËÙ¶ÈΪv£¬ÔòʵÑéÖÐÒªÑéÖ¤µÄµÈʽΪ________£®
ÈôÖØ´¸ÖÊÁ¿
£¬ÖØÁ¦¼ÓËÙ¶È
£¬ÓÉͼÖиø³öµÄÊý¾Ý£¬¿ÉµÃ³ö´ÓOµ½´òÏÂDµã£¬Dµã¶ÔÓ¦µÄÎïÌåµÄËÙ¶È
________
£»ÖØ´¸ÖØÁ¦ÊÆÄܵļõÉÙÁ¿Îª________J£¬¶ø¶¯ÄܵÄÔö¼ÓÁ¿Îª________J
¾ù±£Áô3λÓÐЧÊý×Ö
ʵÑéÖз¢ÏÖÖØÎïÔö¼ÓµÄ¶¯ÄÜÂÔСÓÚ¼õÉÙµÄÖØÁ¦ÊÆÄÜ£¬ÆäÖ÷ÒªÔÒòÊÇ________________________
A.ÖØÎïµÄÖÊÁ¿¹ý´ó B.ÖØÎïµÄÌå»ý¹ýС
C.ʹÓõÄÖ±Á÷µçÔ´ D.ÖØÎï¼°Ö½´øÔÚÏÂÂäʱÊܵ½×èÁ¦£®
¡¾´ð°¸¡¿£¨1£©B£» £¨2£©£» £¨3£©1.94£¬ 0.0380£» 0.0376£» £¨4£©D
¡¾½âÎö¡¿
£¨1£©¿Ì¶È³ß¶ÁÊýÊÇÓ¦ÔÚ×îС¿Ì¶È1mmµÄ»ù´¡ÉÏÏòÏÂһλ¹À¶Á£¬¼´Ó¦µ±±£Áôµ½Ð¡ÊýµãºóµÄÁ½Î»12.40cm£¬ËùÒÔBµã¶ÁÊý²»·ûºÏÒªÇó£®
£¨2£©ÈôOµãµ½Ä³¼ÆÊýµã¾àÀëÓÃh±íʾ£¬ÖØÁ¦¼ÓËÙ¶ÈΪg£¬¸Ãµã¶ÔÓ¦ÖØ´¸µÄ˲ʱËÙ¶ÈΪv£¬ÔòʵÑéÖÐÒªÑéÖ¤µÄµÈʽΪ£ºmgh=mv2£¬¼´gh=
v2£»
£¨3£©¸ù¾ÝÔȱäËÙÖ±ÏßÔ˶¯ÖÐʱ¼äÖеãµÄËٶȵÈÓڸùý³ÌÖеÄƽ¾ùËٶȣ¬¿ÉÒÔÇó³ö´òÖ½´øÉÏDµãʱС³µµÄ˲ʱËٶȴóС£¬
´ÓOµ½Dµã£¬ÖØ´¸ÖØÁ¦ÊÆÄܵļõÉÙÁ¿Îª£ºmghOD=0.0200¡Á9.80¡Á0.1941J=0.0380J
¶¯ÄܵÄÔö¼ÓΪ£ºmvD2-0=0.0376J.
£¨4£©ÊµÑéÖз¢ÏÖÖØÎïÔö¼ÓµÄ¶¯ÄÜÂÔСÓÚ¼õÉÙµÄÖØÁ¦ÊÆÄÜ£¬ÆäÖ÷ÒªÔÒòÊÇÖØÎï¼°Ö½´øÔÚÏÂÂäʱÊܵ½×èÁ¦£¬¹ÊÑ¡D.
![](http://thumb2018.1010pic.com/images/loading.gif)