ÌâÄ¿ÄÚÈÝ
9£®ÈçͼËùʾ£¬¹â»¬Æ½Ðе¼¹ì£¨µç×è²»¿ÉºöÂÔ£©Ë®Æ½·ÅÖ㬵¼¹ì×ó¶Ëͨ¹ý¿ª¹ØSÓëÄÚ×è²»¼Æ¡¢µç¶¯ÊÆΪEµÄµçÔ´ÏàÁ¬£¬Ò»¸ùÖÊÁ¿ÎªmµÄµ¼Ìå°ôabÓó¤ÎªlµÄ¾øԵϸÏßÐü¹Ò£¬ÐüÏßÊúֱʱµ¼Ìå°ôÇ¡ºÃÓëµ¼¹ìÁ¼ºÃ½Ó´¥ÇÒϸÏß´¦ÓÚÕŽô״̬£¬ÏµÍ³¿Õ¼äÓÐÔÈÇ¿´Å³¡£®µ±±ÕºÏ¿ª¹ØSʱ£¬µ¼Ìå°ô±»ÏòÓÒ°Ú³ö£¬°Úµ½×î´ó¸ß¶Èʱ£¬Ï¸ÏßÓëÊúÖ±·½Ïò³É¦È½Ç£¬Ôò£¨¡¡¡¡£©A£® | ´Å³¡·½ÏòÒ»¶¨ÊúÖ±ÏòÏ | |
B£® | µ¼Ìå°ôab¸ÕÒªÀ뿪µ¼¹ìʱ£¬¾øԵϸÏßµÄÀÁ¦¿ÉÄÜΪÁã | |
C£® | µ¼Ìå°ôÀ뿪µ¼¹ìÇ°µçÔ´ÌṩµÄµçÄÜ´óÓÚmgl£¨1-cos¦È£© | |
D£® | µ¼Ìå°ôËùÊܴų¡Á¦µÄ³åÁ¿´óСһ¶¨µÈÓÚm$\sqrt{2gl£¨1-cos¦È£©}$ |
·ÖÎö °ôÔÚͨµç˲¼äÊܵ½°²ÅàÁ¦µÄ×÷Ó㬻ñµÃ¶¯ÄÜ£¬½Óןù¾Ý»úеÄÜÊغ㣬¶¯ÄÜת»¯ÎªÖØÁ¦ÊÆÄÜ£¬µ±´Å³¡ÊúÖ±ÏòÏ£¬¼´Óа²ÅàÁ¦µÄ·½Ïò£¬´Ó¶øµÃ³ö»ñµÃͬÑù¸ß¶Èʱ£¬´Ëʱ°²ÅàÁ¦×îС£»¸ù¾ÝÄÜÁ¿×ª»¯ÓëÊغ㶨ÂÉ£¬ÔòÓеçÔ´ÌṩµÄµçÄܲ¿·Öת»¯Îª¶¯ÄÜ£¬ÁíÒ»²¿·Öת»¯Îªµç×è²úÉúÄÚÄÜ£¬´Ó¶øÈ·¶¨£»ÓÉ»úеÄÜÊغãÇó³ö°ôÔÚ×îµÍµãµÄËٶȣ¬×îºóÓɶ¯Á¿¶¨ÀíÇó³ö³åÁ¿µÄ´óС£®
½â´ð ½â£ºA¡¢µ±¿ª¹ØS±ÕºÏʱ£¬µ¼Ìå°ôÏòÓÒ°ÚÆð£¬ËµÃ÷ÆäËùÊÜ°²ÅàÁ¦Ë®Æ½ÏòÓÒ»òˮƽÏòÓҵķÖÁ¿£¬µ«°²ÅàÁ¦ÈôÓÐÊúÖ±ÏòÉϵķÖÁ¿£¬Ó¦Ð¡ÓÚµ¼Ìå°ôËùÊÜÖØÁ¦£¬·ñÔòµ¼Ìå°ô»áÏòÉÏÌøÆð¶ø²»ÊÇÏòÓÒ°ÚÆð£¬ÓÉ×óÊÖ¶¨Ôò¿ÉÖª£¬´Å³¡·½ÏòбÏòÏ»òÊúÖ±Ïò϶¼³ÉÁ¢£¬¹ÊA´íÎó£»
B¡¢°²ÅàÁ¦ÈôÓÐÊúÖ±ÏòÉϵķÖÁ¿£¬Ó¦Ð¡ÓÚµ¼Ìå°ôËùÊÜÖØÁ¦£¬¶øµ¼Ìå°ôab¸ÕÒªÀ뿪µ¼¹ìʱ»¹ÐèÒªÏòÐÄÁ¦£¬ÔòÓÉÖØÁ¦¡¢°²ÅàÁ¦¡¢ÓëÉþ×ÓµÄÀÁ¦µÄºÏÌṩ£¬ËùÒÔÉþ×ÓµÄÀÁ¦²»¿ÉÄÜΪ0£®¹ÊB´íÎó£»
C¡¢Éèµ¼¹ì°ôÓҶ˵ijõ¶¯ÄÜΪEk£¬°Ú¶¯¹ý³ÌÖлúеÄÜÊغ㣬ÓÐEk=mgl£¨1-cos¦È£©£¬µ¼Ìå°ôµÄ¶¯ÄÜÊǵçÁ÷×ö¹¦¶ø»ñµÃµÄ£¬Èô»Ø·µç×è²»¼Æ£¬ÔòµçÁ÷Ëù×öµÄ¹¦È«²¿×ª»¯Îªµ¼Ìå°ôµÄ¶¯ÄÜ£¬´ËʱÓÐW=IEt=Ek£¬µÃW=mgl£¨1-cos¦È£©£¬ÌâÉèÌõ¼þÓеçÔ´ÄÚ×è²»¼Æ¶øûÓС°ÆäËûµç×è²»¼Æ¡±µÄÏà¹Ø±íÊö£¬Òò´ËÆäËûµç×è²»¿ÉºöÂÔ£¬ÄÇôµçÁ÷×öµÄ¹¦¾Í´óÓÚmgl£¨1-cos¦È£©£¬¹ÊCÕýÈ·£»
D¡¢°ôÏòÉÏÔ˶¯µÄ¹ý³ÌÖлúеÄÜÊغ㣬Ôò£º$\frac{1}{2}m{v}^{2}$=mgl£¨1-cos¦È£©£¬°ô»ñµÃµÄˮƽ·½ÏòµÄ³åÁ¿Ìṩ°ôÑØˮƽ·½ÏòµÄËٶȣ¬¼´£ºI=mv-0£®
ÁªÁ¢µÃ£ºI=$m\sqrt{2gl£¨1-cos¦È£©}$
ÓÉÓÚ°²ÅàÁ¦µÄ·½Ïò²»Ò»¶¨ÑØˮƽ·½Ïò£¬¼´°²ÅàÁ¦ÑØˮƽ·½ÏòµÄ³åÁ¿µÈÓÚ$m\sqrt{2gl£¨1-cos¦È£©}$£¬Ôò°²ÅàÁ¦µÄ×ܳåÁ¿Ò»¶¨´óÓÚµÈÓÚ$m\sqrt{2gl£¨1-cos¦È£©}$£®¹ÊD´íÎó
¹ÊÑ¡£ºC
µãÆÀ ¿¼²é×óÊÖ¶¨ÔòÀ´Åж¨°²ÅàÁ¦µÄ·½Ïò£¬²¢ÔËÓÃÁ¦µÄƽÐÐËıßÐζ¨ÔòÀ´µÃ³ö°²ÅàÁ¦×îСֵµÄ·½Ïò£¬Í¬Ê±ÕÆÎÕÄÜÁ¿×ª»¯ÓëÊغ㶨ÂÉ£¬×¢ÒâµçÁ÷×ö¹¦´óÓÚ°ô»ñµÃµÄ¶¯ÄÜ£®
A£® | ÔÚ0¡«t0ʱ¼äÄÚ¼ÓËٶȲ»±ä£¬ÔÚt0¡«3t0ʱ¼äÄÚ¼ÓËٶȼõС | |
B£® | ½µÂäÉ¡´ò¿ªÇ°£¬½µÂäÉ¡ºÍÉ¡±øµÄ¼ÓËÙ¶ÈÔ½À´Ô½´ó | |
C£® | ÔÚt0¡«3t0µÄʱ¼äÄÚ£¬Æ½¾ùËٶȣ¾$\frac{1}{2}$£¨v1+v2£© | |
D£® | ÈôµÚÒ»¸öÉ¡±øÔÚ¿ÕÖдò¿ª½µÂäɡʱµÚ¶þ¸öÉ¡±øÁ¢¼´ÌøÏ£¬ÔòËûÃÇÔÚ¿ÕÖеľàÀëÏÈÔö´óºó¼õС |
A£® | Éþ×ÓµÄÕÅÁ¦½«Ôö´ó | |
B£® | ÎïÌåA¶ÔбÃæµÄѹÁ¦½«Ôö´ó | |
C£® | Éþ×ÓµÄÕÅÁ¦¼°AÊܵ½µÄ¾²Ä¦²ÁÁ¦¶¼²»±ä | |
D£® | ÎïÌåAÊܵ½µÄ¾²Ä¦²ÁÁ¦ÏȼõСºóÔö´ó |
A£® | ¼×²»ÊÜĦ²ÁÁ¦×÷Óà | |
B£® | ÒÒ¶Ô¼×µÄ×÷ÓÃÁ¦´óÓÚF | |
C£® | ÒÒÊÜĦ²ÁÁ¦µÄºÏÁ¦²»ÎªÁã | |
D£® | ÒԼס¢ÒÒÁ½ÎïÌåΪÕûÌ壬ÕûÌåÊܵ½µÄĦ²ÁÁ¦ÎªÁã |
A£® | ÎïÌåP½«¼õËÙÏ»¬ | B£® | ÎïÌåP½«¼ÌÐøÔÈËÙÏ»¬ | ||
C£® | µØÃæ¶ÔбÃæµÄ¾²Ä¦²ÁÁ¦Ë®Æ½Ïò×ó | D£® | µØÃæ¶ÔбÃæµÄ¾²Ä¦²ÁÁ¦Ë®Æ½ÏòÓÒ |