ÌâÄ¿ÄÚÈÝ
4£®![](http://thumb.1010pic.com/pic3/quiz/images/201504/184/208c814a.png)
£¨1£©Ó͵εijõËÙ¶Èv0Ϊ¶à´ó£¿
£¨2£©ºÏÉÏSºó£¬ÒªÊ¹Ó͵ÎÈÔÒÔÔÀ´µÄËٶȴÓpµã·ÉÈëʱ£¬Ç¡ºÃ´ÓN°åÓÒ±ßÔµÉä³ö£¬ÇóM¡¢NÁ½°å¼äµçÊƲ
£¨3£©ºÏÉÏSºó£¬ÒªÊ¹Ó͵ÎÈÔÒÔÔÀ´µÄËٶȴÓpµã·ÉÈëʱ£¬×îÖÕÄܹ»´òÔÚM°åÉÏ£¬µçÔ´µÄµçѹӦȡʲô·¶Î§£¿
·ÖÎö £¨1£©Ó͵ηÉÈëµç³¡ºó×öƽÅ×Ô˶¯£¬Ë®Æ½·½Ïò×öÔÈËÙÖ±ÏßÔ˶¯£¬ÊúÖ±·½Ïò×ö³õËÙ¶ÈΪÁãµÄÔȼÓËÙÖ±ÏßÔ˶¯£¬ÓÉˮƽ¾àÀëdºÍˮƽ¾àÀë$\frac{L}{2}$¿ÉÇó³öÓ͵εijõËÙ¶Èv0£®
£¨2£©ºÏÉÏSºó£¬ÒªÊ¹Ó͵ÎÈÔÒÔÔÀ´µÄËٶȴÓpµã·ÉÈëʱ£¬Ç¡ºÃ´ÓN°åÓÒ±ßÔµÉä³ö£¬ÀûÓÃÀàƽÅ×Ô˶¯¼´¿ÉÇóµÃµçѹ£®
£¨3£©ºÏÉÏSºó£¬ÒªÊ¹Ó͵ÎÈÔÒÔÔÀ´µÄËٶȴÓpµã·ÉÈëʱ£¬×îÖÕÄܹ»´òÔÚM°åÉÏ£¬Ñо¿Ó͵θպôòM°åÓÒ±ßÔµµÄÇé¿ö£¬ÓÉÀàƽÅ×Ô˶¯µÄ֪ʶÇó½âµçѹ£¬µÃµ½·¶Î§
½â´ð ½â£º
£¨1£©Ó͵ηÉÈëµç³¡ºó×öƽÅ×Ô˶¯£¬Ë®Æ½·½Ïò×öÔÈËÙÖ±ÏßÔ˶¯£¬ÊúÖ±·½Ïò×ö³õËÙ¶ÈΪÁãµÄÔȼÓËÙÖ±ÏßÔ˶¯£¬ÔòÓÐ
ˮƽ·½Ïò£º$\frac{1}{2}$L=v0t
ÊúÖ±·½Ïò£ºd=$\frac{1}{2}g{t}^{2}$
½âµÃ£ºv0=$\frac{L}{2}\sqrt{\frac{g}{2d}}$
£¨2£©Á£×ÓÔÚƫתµç³¡ÖÐ×öÀàƽÅ×Ô˶¯£¬¹Ê
ˮƽ·½Ïò£ºL=v0t
ÊúÖ±·½Ïò£ºd=$\frac{1}{2}£¨g+\frac{qU}{2dm}£©{t}^{2}$
ÁªÁ¢½âµÃ$U=-\frac{3mgd}{4q}$
£¨3£©ºÏÉÏSºó£¬ÒªÊ¹Ó͵ÎÈÔÒÔÔÀ´µÄËٶȴÓpµã·ÉÈëʱ£¬¸ÕºÃ´òM°åÓÒ±ßԵʱ£¬ÉèµçÔ´µÄµçѹΪU£¬
ÔòÓУºd=$\frac{1}{2}at{¡ä}^{2}$£¬L=v0t¡ä
½âµÃ£¬¼ÓËٶȣºa=$\frac{1}{4}$
¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨Âɵãºq$\frac{U}{2d}$-mg=ma
½âµÃ£ºU=$\frac{5mgd}{2q}$
¹ÊҪʹÓ͵ÎÈÔÒÔÔÀ´µÄËٶȴÓpµã·ÉÈëʱ£¬×îÖÕÄܹ»´òÔÚM°åÉÏ£¬µçÔ´µÄµçѹ´óÓÚµÈÓÚ$\frac{5mgd}{2q}$£®
´ð£º£¨1£©Ó͵εijõËÙ¶Èv0Ϊ$\frac{L}{2}\sqrt{\frac{g}{2d}}$
£¨2£©ºÏÉÏSºó£¬ÒªÊ¹Ó͵ÎÈÔÒÔÔÀ´µÄËٶȴÓpµã·ÉÈëʱ£¬Ç¡ºÃ´ÓN°åÓÒ±ßÔµÉä³ö£¬M¡¢NÁ½°å¼äµçÊƲîΪ$-\frac{3mgd}{4q}$£»
£¨3£©ºÏÉÏSºó£¬ÒªÊ¹Ó͵ÎÈÔÒÔÔÀ´µÄËٶȴÓpµã·ÉÈëʱ£¬×îÖÕÄܹ»´òÔÚM°åÉÏ£¬µçÔ´µÄµçѹӦ´óÓÚµÈÓÚ$\frac{5mgd}{2q}$£®
µãÆÀ ±¾ÌâÖ÷Òª¿¼²éÁËƽÅ×Ô˶¯ºÍÀàƽÅ×Ô˶¯£¬ÔÚƫתµç³¡ÖÐÒª¿¼ÂÇÓ͵εÄÖØÁ¦£¬ÔÚˮƽ·½ÏòÔÈËÙÔ˶¯£¬ÊúÖ±·½Ïò×ö³õËÙ¶ÈΪÁãµÄÔȼÓËÙÔ˶¯¼´¿É
![](http://thumb2018.1010pic.com/images/loading.gif)
![](http://thumb.1010pic.com/pic3/quiz/images/201504/182/3ce9fc3f.png)
A£® | F2£¾F£¬F1=0 | B£® | F1£¾F£¬F2=0 | C£® | F£¾F1£¬F2=0 | D£® | F£¾F2£¬F1=0 |
![](http://thumb.1010pic.com/pic3/quiz/images/201504/184/7136a9d0.png)
A£® | AËùÊÜÂåÂ××ÈÁ¦´óС | B£® | AÎï¿é¼ÓËٶȴóС | ||
C£® | A¶ÔBѹÁ¦´óС | D£® | A¶ÔBµÄĦ²ÁÁ¦´óС |
A£® | Òº¾§¾ßÓÐÁ÷¶¯ÐÔ£¬¹âѧÐÔÖʸ÷ÏòÒìÐÔ | |
B£® | ÆøÌåÀ©É¢ÏÖÏó±íÃ÷ÆøÌå·Ö×Ó¼ä´æÔÚ³âÁ¦ | |
C£® | ÈÈÁ¿×ÜÊÇ×Ô·¢µÄ´Ó·Ö×Óƽ¾ù¶¯ÄÜ´óµÄÎïÌå´«µÝµ½·Ö×Óƽ¾ù¶¯ÄÜСµÄÎïÌå | |
D£® | »úеÄܲ»¿ÉÄÜÈ«²¿×ª»¯ÎªÄÚÄÜ£¬ÄÚÄÜÒ²ÎÞ·¨È«²¿ÓÃÀ´×ö¹¦ÒÔת»¯³É»úеÄÜ | |
E£® | ÒºÌå±íÃæ²ã·Ö×Ó¼ä¾àÀë´óÓÚÒºÌåÄÚ²¿·Ö×Ó¼ä¾àÀ룬ËùÒÔÒºÌå±íÃæ´æÔÚ±íÃæÕÅÁ¦ |
A£® | սʿ½«ÈËËÍÉÏ°¶µÄ×î¶Ìʱ¼äÒ»¶¨Îª$\frac{d}{{\sqrt{v_2^2-v_1^2}}}$ | |
B£® | ÈôսʿÔÚ×î¶Ìʱ¼äÄÚ½«ÈËËÍÉÏ°¶£¬ÆäµÇ½µØµãÀëOµãµÄ¾àÀëΪ$\frac{{d{v_1}}}{v_2}$ | |
C£® | սʿ½«ÈËËÍÉÏ°¶Ëùͨ¹ýµÄλÒÆÒ»¶¨Îªd | |
D£® | Èôսʿ¼ÝÊ»µÄĦÍÐͧµÄº½ÏòʼÖÕÖ¸ÏòÕý¶Ô°¶£¬ÆäµÇ½µØµãÒ»¶¨ÊÇOµã |