·ÖÎö £¨1£©¶ÔP¡¢Q¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉÁз½³ÌÇóPÎïÌå¸Õ¿ªÊ¼ÔÚ´«ËÍ´øÉÏÔ˶¯µÄ¼ÓËÙ¶È´óС
£¨2£©PÏÈÒÔ¼ÓËÙ¶Èa1Ïò×ó×öÔȼõËÙÔ˶¯£¬Ö±µ½ËٶȼõΪ${v}_{1}^{\;}$£¬¸ù¾ÝËÙ¶Èʱ¼ä¹ØÏµÇó³öʱ¼ä${t}_{1}^{\;}$£¬ÔÙÓÉ$x=\frac{{v}_{1}^{\;}+{v}_{2}^{\;}}{2}{t}_{1}^{\;}$ÇóÏòÓÒÔ˶¯µÄÎ»ÒÆ´óС
£¨3£©ËÙ¶ÈÏàµÈÒÔºó½Ó×ÅÒÔ¼ÓËÙ¶Èa2Ïò×ó×öÔȼõËÙÔ˶¯£¬ÓÉÅ£¶ÙµÚ¶þ¶¨ÂÉÇó³ö${a}_{2}^{\;}$£¬ÓÉËÙ¶ÈÎ»ÒÆ¹«Ê½Çó³öÎï¿éµ½´«ËÍ´øÓҶ˵ÄËÙ¶È£¬¸ù¾ÝËÙ¶Èʱ¼ä¹ØÏµÇó³öËÙ¶ÈÏàµÈºóÔ˶¯µÄʱ¼ä${t}_{2}^{\;}$£¬¼´¿ÉÇó³ö×Üʱ¼ä
½â´ð ½â£º£¨1£©ÉèP¿ªÊ¼×ö¼õËÙÔ˶¯µÄ¼ÓËÙ¶ÈΪa1£¬¶ÔPÓÐ T+¦Ìmg=ma1
¶ÔQÓÐ mg-T=ma1
½âµÃa1=6m/s2
£¨2£©¾Ê±¼ät1Óë´«ËÍ´ø´ïÏàͬËÙ¶È£¬${t}_{1}^{\;}=\frac{{v}_{2}^{\;}-{v}_{1}^{\;}}{{a}_{1}^{\;}}=\frac{9-6}{6}s=0.5s$
ÔÚʱ¼ät1ÄÚPµÄÎ»ÒÆ${x}_{1}^{\;}=\frac{{v}_{1}^{\;}+{v}_{2}^{\;}}{2}{t}_{1}^{\;}=\frac{6+9}{2}¡Á0.5=3.75m$
£¨3£©´ï¹²Í¬ËٶȺóÏòÓÒ¼õËÙÔ˶¯£¬¼ÓËÙ¶È´óСΪa2£¬¶ÔPÓÐ T¡ä-¦Ìmg=ma2
¶ÔQÓÐ mg-T¡ä=ma2
½âµÃa2=4m/s2
Pµ½´ï´«ËÍ´øµÄÓÒ¶ËËÙ¶ÈΪ$v=\sqrt{{v}_{1}^{2}-2{a}_{2}^{\;}£¨L-{x}_{1}^{\;}£©}$=$\sqrt{{6}_{\;}^{2}-2¡Á4¡Á£¨7.75-3.75£©}$=2m/s
PÔËËÍʱ¼äΪ${t}_{2}^{\;}=\frac{{v}_{1}^{\;}-v}{{a}_{2}^{\;}}=\frac{6-2}{4}=1s$
×Üʱ¼äΪt=t1+t2=1.5s
´ð£º£¨1£©PÎïÌå¸Õ¿ªÊ¼ÔÚ´«ËÍ´øÉÏÔ˶¯µÄ¼ÓËÙ¶È´óС6m/s2£»
£¨2£©PÎïÌåËÙ¶ÈÓë´«ËÍ´øËÙ¶ÈÏàµÈʱÆäÏòÓÒÔ˶¯µÄÎ»ÒÆ´óСΪ3.75m
£¨3£©PÎïÌåÔÚ´«ËÍ´øÉÏÔ˶¯µÄʱ¼äΪ1.5s£®
µãÆÀ ±¾ÌâÖ÷Òª¿¼²éÁËÎïÌåÔÚ´«ËÍ´øÉϵÄÔ˶¯¹ý³Ì£¬·ÖÇå¹ý³ÌÊǹؼü£¬Ìرð×¢ÒâĦ²ÁÁ¦·½ÏòµÄ¸Ä±ä
| Äê¼¶ | ¸ßÖÐ¿Î³Ì | Äê¼¶ | ³õÖÐ¿Î³Ì |
| ¸ßÒ» | ¸ßÒ»Ãâ·Ñ¿Î³ÌÍÆ¼ö£¡ | ³õÒ» | ³õÒ»Ãâ·Ñ¿Î³ÌÍÆ¼ö£¡ |
| ¸ß¶þ | ¸ß¶þÃâ·Ñ¿Î³ÌÍÆ¼ö£¡ | ³õ¶þ | ³õ¶þÃâ·Ñ¿Î³ÌÍÆ¼ö£¡ |
| ¸ßÈý | ¸ßÈýÃâ·Ñ¿Î³ÌÍÆ¼ö£¡ | ³õÈý | ³õÈýÃâ·Ñ¿Î³ÌÍÆ¼ö£¡ |
¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º¼ÆËãÌâ
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º½â´ðÌâ
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º¶àÑ¡Ìâ
| A£® | СÇòÏòÏÂÔ˶¯0.05 mʱËÙ¶È×î´ó | B£® | СÇòÏòÏÂÔ˶¯0.01 mʱÓëµ²°å·ÖÀë | ||
| C£® | СÇòËÙ¶È×î´óʱÓëµ²°å·ÖÀë | D£® | СÇò´ÓÒ»¿ªÊ¼Ô˶¯¾ÍÓëµ²°å·ÖÀë |
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º½â´ðÌâ
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º½â´ðÌâ
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º½â´ðÌâ
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ
| A£® | 40m | B£® | 80 m | C£® | 120 m | D£® | 160 m |
²é¿´´ð°¸ºÍ½âÎö>>
¹ú¼ÊѧУÓÅÑ¡ - 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