A£® | ÎïÌåm1ËùÊÜĦ²ÁÁ¦µÄ·½ÏòÒ»¶¨Ë®Æ½Ïò×ó | |
B£® | ÎïÌåm1ËùÊÜĦ²ÁÁ¦µÄ·½Ïò¿ÉÄÜˮƽÏò×ó | |
C£® | Èƹý¶¨»¬ÂÖµÄϸÉþµÄÀÁ¦Ò»¶¨µÈÓÚm3µÄÖØÁ¦ | |
D£® | ÎÞÂÛm3¶à´ó£¬m1¡¢m2¼ä¶¼²»»á·¢ÉúÏà¶Ô»¬¶¯ |
·ÖÎö ËÉÊÖÊÍ·Å${m}_{3}^{\;}$ºó£¬${m}_{3}^{\;}$ÏòÏÂ×öÔȼÓËÙÔ˶¯£¬¼ÓËÙ¶ÈÏòÏ£¬´¦ÓÚʧÖØ״̬£¬ËùÒÔÈƹý¶¨»¬ÂÖµÄϸÉþµÄÀÁ¦Ò»¶¨Ð¡ÓÚ${m}_{3}^{\;}$µÄÖØÁ¦£¬ÓÉ${m}_{1}^{\;}$µÄÊÜÁ¦Çé¿ö¼°Ô˶¯Çé¿ö·ÖÎöĦ²ÁÁ¦·½Ïò£¬¸ôÀë${m}_{1}^{\;}$¡¢${m}_{2}^{\;}$¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉ·ÖÎö${m}_{1}^{\;}$Óë${m}_{2}^{\;}$Ö®¼äÄÜ·ñ·¢ÉúÏà¶Ô»¬¶¯£®
½â´ð ½â£º${m}_{3}^{\;}$Óɾ²Ö¹ÂäϺó×ö¼ÓËÙÔ˶¯£¬¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉ£¬ÓÐ${{m}_{3}^{\;}g-F}_{T}^{¡ä}={m}_{3}^{\;}a$£¬Èƹý¶¨»¬ÂÖµÄϸÉþµÄÀÁ¦Ò»¶¨Ð¡ÓÚ${m}_{3}^{\;}g$£¬¹ÊC´íÎ󣻶Ô${m}_{1}^{\;}$¶øÑÔ£¬ÒòΪÓÐÏòÓҵļÓËٶȣ¬ºÏÁ¦ÏòÓÒ£¬¼ÙÉè${m}_{1}^{\;}$ËùÊܵÄĦ²ÁÁ¦Ë®Æ½Ïò×󣬸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉ£¬ÓÐ$\frac{{F}_{T}^{¡ä}}{2}-f={m}_{1}^{\;}a$£¬Èç¹ûa½ÏС£¬f£¾0£¬Èç¹ûa½Ï´ó£¬f¿ÉÄÜ¡Ü0£¬ËùÒÔ${m}_{1}^{\;}$ËùÊܵÄĦ²ÁÁ¦·½Ïò¿ÉÄÜˮƽÏò×ó£¬Ò²¿ÉÄÜˮƽÏòÓÒ£®¹ÊA´íÎó£¬BÕýÈ·
${m}_{3}^{\;}$ÏÂÂä¹ý³ÌÖУ¬¶Ô${m}_{1}^{\;}$¡¢${m}_{2}^{\;}$ÊÜÁ¦·ÖÎöÈçͼ£¬¼ÙÉè${m}_{1}^{\;}={m}_{2}^{\;}=m$£¬Í¬Ê±¼ÙÉè${m}_{1}^{\;}$ËùÊÜĦ²ÁÁ¦Ë®Æ½Ïò×󣬸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉ£¬ÓÐ
¶Ô${m}_{1}^{\;}$£º$\frac{{F}_{T}^{\;}}{2}-f=m{a}_{1}^{\;}$
¶Ô${m}_{2}^{\;}$£º$\frac{{F}_{T}^{\;}}{2}+f=m{a}_{2}^{\;}$
${a}_{1}^{\;}¡Ù{a}_{2}^{\;}$£¬ËùÒÔ${m}_{1}^{\;}$¡¢${m}_{2}^{\;}$»á·¢ÉúÏà¶Ô»¬¶¯£¬¹ÊD´íÎó£®
×ÛÉÏËùÊö£ºBÕýÈ·
¹ÊÑ¡£ºB
µãÆÀ ±¾ÌâÊÇÁ¬½ÓÌåÎÊÌ⣬¹Ø¼üÒªÀíÇåÎïÌåµÄÔ˶¯Çé¿ö£¬×¥×¡ÁÙ½çÌõ¼þ£¬Îï¿ém1Óëm2·¢ÉúÏà¶ÔÔ˶¯Ê±£¬Á½ÕßÖ®¼äµÄ¼ÓËٶȲ»ÏàµÈ£¬Í¬Ê±Òª×¢ÒâÇ¡µ±Ñ¡ÔñÑо¿¶ÔÏó£¬Ò»°ãÓÃÕûÌå·¨»ò¸ôÀë·¨¶ÔÎïÌåÊÜÁ¦·ÖÎö£¬È»ºóÔËÓÃÅ£¶ÙµÚ¶þ¶¨ÂÉÁÐʽ¼ÆË㣮
Ä꼶 | ¸ßÖÐ¿Î³Ì | Ä꼶 | ³õÖÐ¿Î³Ì |
¸ßÒ» | ¸ßÒ»Ãâ·Ñ¿Î³ÌÍƼö£¡ | ³õÒ» | ³õÒ»Ãâ·Ñ¿Î³ÌÍƼö£¡ |
¸ß¶þ | ¸ß¶þÃâ·Ñ¿Î³ÌÍƼö£¡ | ³õ¶þ | ³õ¶þÃâ·Ñ¿Î³ÌÍƼö£¡ |
¸ßÈý | ¸ßÈýÃâ·Ñ¿Î³ÌÍƼö£¡ | ³õÈý | ³õÈýÃâ·Ñ¿Î³ÌÍƼö£¡ |
¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ
A£® | 20m | B£® | 50m | C£® | 80m | D£® | 100m |
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÊµÑéÌâ
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º¶àÑ¡Ìâ
A£® | Îï¿éÏÈ×öÔȼÓËÙÔ˶¯£¬ºó×öÔÈËÙÔ˶¯ | |
B£® | ÔÚСÇòÓëÎï¿é·ÖÀëÇ°£¬µ±Çá¸ËÓëˮƽÃæµÄ¼Ð½ÇΪ¦È£¬Ð¡ÇòµÄËٶȴóСΪvʱ£¬ÔòMµÄËÙ¶ÈΪvsin¦È | |
C£® | СÇòÓëÎï¿é·ÖÀëʱ£¬Ð¡ÇòÒ»¶¨Ö»ÊÜÖØÁ¦×÷Óà | |
D£® | СÇòÒ»Ö±¶ÔÎï¿éÓÐ×÷ÓÃÁ¦£¬Ö±µ½Ð¡ÇòÂäµØµÄ˲¼äÓëÎï¿é·ÖÀëΪֹ |
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º¶àÑ¡Ìâ
A£® | ·Ö×Ó¼ä¾àÀëÔö´óʱ£¬·Ö×Ó¼äµÄÒýÁ¦ºÍ³âÁ¦¶¼¼õС | |
B£® | À©É¢ÏÖÏóµÄÔÒòÊÇ·Ö×Ó¼ä´æÔÚ×ųâÁ¦ | |
C£® | µÚ¶þÀàÓÀ¶¯»úË䲻Υ±³ÄÜÁ¿Êغ㶨ÂÉ£¬µ«Ò²ÊDz»¿ÉÄÜÖÆ³ÉµÄ | |
D£® | ÈÈ´«µÝµÄ¹ý³Ì×ÜÊÇ×Ô·¢µØÓÉÈÈÁ¿½Ï¶àµÄÎïÌå´«µÝ¸øÈÈÁ¿½ÏÉÙµÄÎïÌå | |
E£® | ÌìȻʯӢ±íÏÖΪ¸÷ÏòÒìÐÔ£¬Æä·Ö×ÓÊÇ°´Ò»¶¨¹æÔòÅÅÁÐµÄ |
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÊµÑéÌâ
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º¶àÑ¡Ìâ
A£® | Îï¿é×ö¼ÓËÙÔ˶¯ | B£® | Îï¿é×ö¼õËÙÔ˶¯ | ||
C£® | Éþ×ÓÀÁ¦´óÓÚÖØÁ¦ | D£® | Éþ×ÓÀÁ¦Ð¡ÓÚÖØÁ¦ |
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ
A£® | e=nBS¦Øcos2¦Øt | B£® | e=nBS¦Øcos¦Øt | C£® | e=nBS2¦Øcos2¦Øt | D£® | e=nBS$\frac{¦Ø}{2}$cos$\frac{1}{2}$¦Øt |
²é¿´´ð°¸ºÍ½âÎö>>
°Ù¶ÈÖÂÐÅ - Á·Ï°²áÁбí - ÊÔÌâÁбí
ºþ±±Ê¡»¥ÁªÍøÎ¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨Æ½Ì¨ | ÍøÉÏÓк¦ÐÅÏ¢¾Ù±¨×¨Çø | µçÐÅթƾٱ¨×¨Çø | ÉæÀúÊ·ÐéÎÞÖ÷ÒåÓк¦ÐÅÏ¢¾Ù±¨×¨Çø | ÉæÆóÇÖȨ¾Ù±¨×¨Çø
Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com