ÌâÄ¿ÄÚÈÝ
20£®ÓÃÂäÌå·¨ÑéÖ¤»úеÄÜÊغ㶨ÂÉ£¬Æ÷²Ä°²×°Èçͼ¼×£º£¨1£©ÇëÖ¸³öͼ¼×ÖеĴíÎó¼°²»Í×Ö®´¦£¨ÖÁÉÙд³öÁ½´¦£©
¢ÙʹÓõÄÊÇÖ±Á÷µçÔ´£¬¢ÚûÓдÓÉÏ·½Ìá×ÅÖ½´ø£¬¶øÊÇÓÃÊÖÍÐ×ÅÖØÎ
£¨2£©¸Ä½øʵÑéÖдíÎó¼°²»Í×Ö®´¦ºó£¬´ò³öÈçͼÒÒËùʾһÌõÖ½´ø£®ÒÑÖª´òµã¼ÆʱÆ÷ƵÂÊΪ50Hz£¬¸ù¾ÝÖ½´øËù¸øÊý¾Ý£¬´òCµãʱÖØÎïµÄËÙ¶ÈΪ2.2m/s£¨½á¹û±£ÁôÁ½Î»ÓÐЧÊý×Ö£©£®
£¨3£©Ä³Í¬Ñ§Ñ¡ÓÃÁ½¸öÐÎ×´ÏàͬÖÊÁ¿²»Í¬µÄÖØÎïaºÍb½øÐÐʵÑé²âµÃ¼¸×éÊý¾Ý£¬»³ö$\frac{{v}^{2}}{2}$-hµÄͼÏóÈçͼ±ûËùʾ£¬Çó³öͼÏßµÄбÂÊk£¬ÓÉͼÏó¿ÉÖªaµÄÖÊÁ¿m1´óÓÚbµÄÖÊÁ¿m2£¨Ñ¡Ìî¡°´óÓÚ¡±»ò¡°Ð¡ÓÚ¡±£©£®
£¨4£©ÊµÑé½á¹û·¢ÏÖ¶¯ÄÜÔöÁ¿×ÜСÓÚ£¨Ìî¡°´óÓÚ¡±¡¢¡°µÈÓÚ¡±»ò¡°Ð¡ÓÚ¡±£©ÖØÁ¦ÊÆÄܵļõСÁ¿£»Ôì³ÉÕâÖÖÏÖÏóµÄÖ÷ÒªÔÒòÊÇC£®
A£®Ñ¡ÓõÄÖØ´¸ÖÊÁ¿¹ý´ó
B£®Êý¾Ý´¦Àíʱ³öÏÖ¼ÆËã´íÎó
C£®¿ÕÆø¶ÔÖØ´¸µÄ×èÁ¦ºÍ´òµã¼ÆʱÆ÷¶ÔÖ½´øµÄ×èÁ¦
D£®ÊµÑéʱ²Ù×÷²»¹»Ï¸£¬ÊµÑéÊý¾Ý²âÁ¿²»×¼È·£®
·ÖÎö £¨1£©¸ù¾ÝʵÑéµÄÔÀíºÍ²Ù×÷ÖеÄ×¢ÒâÊÂÏîÈ·¶¨´íÎóºÍ²»Í×Ö®´¦£®
£¨2£©¸ù¾Ýij¶Îʱ¼äÄÚµÄƽ¾ùËٶȵÈÓÚÖмäʱ¿ÌµÄ˲ʱËÙ¶ÈÇó³öCµãµÄËٶȣ®
£¨3£©¸ù¾Ý¶¯Äܶ¨ÀíµÃ³öͼÏßбÂʵÄÎïÀíÒâÒ壬½áºÏбÂʵĴóС±È½ÏÖÊÁ¿µÄ´óС£®
£¨4£©ÖØÎïÏÂÂä¹ý³ÌÖв»¿É±ÜÃâµÄÊܵ½×èÁ¦×÷Óã¬ÖØÁ¦ÊÆÄܲ»¿ÉÄÜÈ«²¿×ª»¯Îª¶¯ÄÜ£¬ÕâÊÇÎó²îµÄÖ÷ÒªÀ´Ô´£®
½â´ð ½â£º£¨1£©Í¼¼×ÖеĴíÎó¼°²»Í×Ö®´¦£º¢ÙʹÓõÄÊÇÖ±Á÷µçÔ´£»¢ÚÖØÎïÀë´òµã¼ÆʱÆ÷Ì«Ô¶£»¢ÛûÓдÓÉÏ·½Ìá×ÅÖ½´ø£¬¶øÊÇÓÃÊÖÍÐ×ÅÖØÎ
£¨2£©CµãµÄ˲ʱËٶȵÈÓÚBD¶ÎµÄƽ¾ùËٶȣ¬ÔòÓУºvC=$\frac{{x}_{BD}}{2T}$=$\frac{31.23-22.24}{2¡Á0.02}¡Á1{0}^{-2}$m/s=2.2m/s£®
£¨3£©¸ù¾Ý¶¯Äܶ¨ÀíÖª£º£¨mg-f£©h=$\frac{1}{2}$mv2£¬ÔòÓУº$\frac{{v}^{2}}{2}$=$\frac{mg-f}{m}$h£¬ÖªÍ¼ÏßµÄбÂÊk=$\frac{mg-f}{m}$=g-$\frac{f}{m}$£¬bµÄбÂÊС£¬ÖªbµÄÖÊÁ¿Ð¡£¬
ËùÒÔaµÄÖÊÁ¿m1´óÓÚbµÄÖÊÁ¿m2£®
£¨4£©ÔÚ¸ÃʵÑéÖУ¬ÓÉÓÚĦ²ÁÁ¦¡¢¿ÕÆø×èÁ¦µÈ×èÁ¦µÄ´æÔÚ£¬ÖØ´¸¶¯ÄܵÄÔö¼ÓÁ¿×ÜÊÇÉÔÉÔСÓÚ¼õСµÄÖØÁ¦ÊÆÄÜ£»ÈôÖØ´¸¶¯ÄܵÄÔö¼ÓÁ¿×ÜÊÇСÓÚÖØ´¸¼õСµÄÖØÁ¦ÊÆÄÜ£¬¶øÇұȽÏÃ÷ÏÔ£¬¾ÍÒª¿¼ÂÇ×èÁ¦Ì«´óµÄÔÒò£®ÔÚ¸ÃʵÑé¹ý³ÌµÄ²½ÖèÖУ¬Ã»Óмì²é´òµã¼ÆʱÆ÷µÄÁ½¸öÏÞλ¿×ÊÇ·ñÔÚͬһÌõÊúÖ±ÏßÉÏ£¬Ò²»áµ¼ÖÂĦ²ÁÁ¦Ì«´ó£»¹ÊCÕýÈ·£¬ABD´íÎó£®
¹Ê´ð°¸Îª£º£¨1£©¢ÙʹÓõÄÊÇÖ±Á÷µçÔ´£»¢ÚÖØÎïÀë´òµã¼ÆʱÆ÷Ì«Ô¶£¬»òûÓдÓÉÏ·½Ìá×ÅÖ½´ø£¬¶øÊÇÓÃÊÖÍÐ×ÅÖØÎ£¨2£©2.2£»£¨3£©´óÓÚ£»£¨4£©Ð¡ÓÚ£¬C£®
µãÆÀ ½â¾ö±¾ÌâµÄ¹Ø¼üÖªµÀʵÑéµÄÔÀíÒÔ¼°²Ù×÷ÖеÄ×¢ÒâÊÂÏ¶ÔÓÚͼÏóÎÊÌ⣬һ°ãµÄ½âÌâ˼·µÃ³öÎïÀíÁ¿Ö®¼äµÄ¹Øϵʽ£¬½áºÏͼÏßµÄбÂÊ·ÖÎöÅжϣ®ÕýÈ·½â´ðʵÑéÎÊÌâµÄÇ°ÌáÊÇÃ÷ȷʵÑéÔÀí£¬´ÓʵÑéÔÀí³ö·¢½øÐзÖÎöËùÐèʵÑéÆ÷²Ä¡¢Ëù²âÊý¾Ý¡¢Îó²î·ÖÎöµÈ£¬»áÆðµ½Ê°빦±¶µÄЧ¹û£®
A£® | Á£×Ó´øÕýµç | B£® | Á£×ÓËÙ¶ÈÖð½¥¼õС | ||
C£® | AµãµÄ³¡Ç¿Ð¡ÓÚBµã³¡Ç¿ | D£® | Á£×ӵĵçÊÆÄܼõС |
A£® | Ö»½«S1´Ó2²¦Ïò1ʱ£¬µçÁ÷±íʾÊý±äС | |
B£® | Ö»½«S2´Ó4²¦Ïò3ʱ£¬µçÁ÷±íʾÊý±ä´ó | |
C£® | Ö»½«S3´Ó±ÕºÏ±äΪ¶Ï¿ª£¬µç×èR2Á½¶Ëµçѹ²»±ä | |
D£® | Ö»½«±ä×èÆ÷R3µÄ»¬¶¯´¥Í·ÉÏÒÆ£¬±äѹÆ÷µÄÊäÈ빦ÂÊÔö´ó |