ÌâÄ¿ÄÚÈÝ
£¨16·Ö£©ÈçͼËùʾ£¬º½¿Õĸ½¢ÉϵÄÆð·ÉÅܵÀÓɳ¤¶ÈΪl1="160" mµÄˮƽÅܵÀºÍ³¤¶ÈΪl2 =" 20" mµÄÇãбÅܵÀÁ½²¿·Ö×é³É¡£Ë®Æ½ÅܵÀÓëÇãбÅܵÀÄ©¶ËµÄ¸ß¶È²îh =" 4.0" m¡£Ò»¼ÜÖÊÁ¿Îªm = 2.0¡Á104 kgµÄ·É»ú,ÆäÅçÆø·¢¶¯»úµÄÍÆÁ¦´óСºãΪF = 1.2¡Á105 N£¬·½ÏòÓëËٶȷ½ÏòÏàͬ£¬ÔÚÔ˶¯¹ý³ÌÖзɻúÊܵ½µÄƽ¾ù×èÁ¦´óСΪ·É»úÖØÁ¦µÄ0.1±¶¡£¼ÙÉ躽ĸ´¦ÓÚ¾²Ö¹×´Ì¬£¬·É»úÖÊÁ¿ÊÓΪ²»±ä²¢¿É¿´³ÉÖʵã,È¡g =" 10" m/s2¡£
£¨1£©Çó·É»úÔÚˮƽÅܵÀÔ˶¯µÄʱ¼ä¼°µ½´ïÇãбÅܵÀÄ©¶ËʱµÄËٶȴóС£»
£¨2£©ÎªÁËʹ·É»úÔÚÇãбÅܵÀµÄÄ©¶Ë´ïµ½Æð·ÉËÙ¶È100 m/s£¬Íâ½ç»¹ÐèÒªÔÚÕû¸öˮƽ¹ìµÀ¶Ô·É»úÊ©¼ÓÖúÍÆÁ¦£¬ÇóÖúÍÆÁ¦FÍƵĴóС¡£
£¨1£©£¨2£©
½âÎöÊÔÌâ·ÖÎö£º£¨1£©·É»úÔÚˮƽÅܵÀÉÏÔ˶¯Ê±£¬Ë®Æ½·½ÏòÊܵ½ÍÆÁ¦Óë×èÁ¦×÷Óã¬Éè¼ÓËٶȴóСΪa1¡¢Ä©ËٶȴóСΪv1£¬Ô˶¯Ê±¼äΪt1£¬ÓÐ ¢Ù
¢Ú
¢Û
×¢Òâµ½v0 =" 0," £¬´úÈëÒÑÖªÊý¾Ý¿ÉµÃ
a1 =" 5.0" m/s2£¬v1 =" 40" m/s£¬t1 =" 8.0" s ¢Ü
·É»úÔÚÇãбÅܵÀÉÏÔ˶¯Ê±£¬ÑØÇãбÅܵÀÊܵ½ÍÆÁ¦¡¢×èÁ¦ÓëÖØÁ¦ÑØбÃæ·ÖÁ¦×÷Óã¬ÉèÑØбÃæ·½ÏòµÄ¼ÓËٶȴóСΪa2¡¢Ä©ËٶȴóСΪv2£¬ÑØбÃæ·½ÏòÓÐ ¢Ý
¢Þ
¢ß
×¢Òâµ½v1 =" 40" m/s ,´úÈëÒÑÖªÊý¾Ý¿ÉµÃ
a2 =" 3.0" m/s2£¬ ¢à
£¨2£©·É»úÔÚˮƽÅܵÀÉÏÔ˶¯Ê±£¬Ë®Æ½·½ÏòÊܵ½ÍÆÁ¦¡¢ÖúÍÆÁ¦Óë×èÁ¦×÷Óã¬Éè¼ÓËٶȴóСΪa´1¡¢Ä©ËٶȴóСΪv´1£¬ÓÐ ¢á
¢â
·É»úÔÚÇãбÅܵÀÉÏÔ˶¯Ê±£¬ÑØÇãбÅܵÀÊܵ½ÍÆÁ¦¡¢×èÁ¦ÓëÖØÁ¦ÑØбÃæ·ÖÁ¦×÷ÓÃûÓб仯£¬¼ÓËٶȴóСÈÔÓÐa´2=" 3.0" m/s2 11
¸ù¾ÝÌâÒ⣬v´2 =" 100" m/s£¬´úÈëÊý¾Ý½âµÃ
±¾ÌâÒªÇó¿¼Éú׼ȷ½øÐÐÊÜÁ¦·ÖÎö¡¢ÊìÁ·Ó¦ÓÃÅ£¶ÙµÚ¶þ¶¨ÂÉ¡¢Áé»îÓ¦ÓÃÔȱäËÙÖ±ÏßÔ˶¯¹æÂÉ¡£±¾Ì⻹¿ÉÒÔÔËÓö¯Äܶ¨ÀíÀ´Çó½â£¬¶¯Á¦Ñ§ÎÊÌâµÄ½âÌâ˼·ÊÇ£ºÊ×ÏÈ¿¼ÂǶ¯Äܶ¨Àí£¬Æä´ÎÊÇÅ£¶ÙÔ˶¯¶¨ÂÉ¡£
¿¼µã£º±¾Ìâ×ۺϿ¼²é¶¯Á¦Ñ§ÎÊÌâµÄÇó½â¡£
![](http://thumb2018.1010pic.com/images/loading.gif)
A¡¢µÚ5sÄ©ÊÇʱ¼äµÄ¸ÅÄÒѾÀúÁË5s | B¡¢µÚ4sÊÇʱ¼äµÄ¸ÅÄ¹²¾ÀúÁË4s | C¡¢×îºó2sÊÇʱ¼äµÄ¸ÅÄ¹²¾ÀúÁË2s | D¡¢3sÄ©ÊÇʱ¼äµÄ¸ÅÄ¹²¾ÀúÁË3s |
A¡¢Æ½¾ùËÙ¶ÈÊÇÖ¸ÎïÌåͨ¹ýµÄ·³ÌÓëËùÓÃʱ¼äµÄ±ÈÖµ | B¡¢Æ½¾ùËÙÂʾÍÊÇƽ¾ùËٶȵĴóС | C¡¢Ë²Ê±Ëٶȣ¬Æä´óС¾ÍÊÇ˲ʱËÙÂÊ£¬Æä·½Ïò¾ÍÊÇÎïÌåÔ˶¯µÄ·½Ïò | D¡¢Æ½¾ùËٶȵķ½Ïò¾ÍÊÇÎïÌåÔ˶¯µÄ·½Ïò£¬ÇÒÆäÓëλÒƵķ½Ïò×ÜÊÇÒ»Ö嵀 |
×ÔÈ»½çµÄµç¡¢ÈȺʹŵÈÏÖÏó¶¼ÊÇÏ໥ÁªÏµµÄ£¬ºÜ¶àÎïÀíѧ¼ÒΪѰÕÒËüÃÇÖ®¼äµÄÁªÏµ×ö³öÁ˹±Ï×£®ÏÂÁÐ˵·¨´íÎóµÄÊÇ (¡¡ )
A£®°Â˹ÌØ·¢ÏÖÁ˵çÁ÷µÄ´ÅЧӦ£¬½ÒʾÁ˵çÏÖÏóºÍ´ÅÏÖÏóÖ®¼äµÄÁªÏµ |
B£®Å·Ä··¢ÏÖÁËÅ·Ä·¶¨ÂÉ£¬ËµÃ÷ÁËÈÈÏÖÏóºÍµçÏÖÏóÖ®¼ä´æÔÚÁªÏµ |
C£®·¨ÀµÚ·¢ÏÖÁ˵ç´Å¸ÐÓ¦ÏÖÏ󣬽ÒʾÁË´ÅÏÖÏóºÍµçÏÖÏóÖ®¼äµÄÁªÏµ |
D£®½¹¶ú·¢ÏÖÁ˵çÁ÷µÄÈÈЧӦ£¬¶¨Á¿¸ø³öÁ˵çÄܺÍÈÈÄÜÖ®¼äµÄת»»¹Øϵ |
ÏÂÁÐÎïÀíÁ¿ÖУ¬ÊôÓÚʸÁ¿£¬Í¬Ê±Æ䵥λÊôÓÚ»ù±¾µ¥Î»µÄÊÇ
A£®ËÙ¶È | B£®Á¦ | C£®Î»ÒÆ | D£®ÖÊÁ¿ |
ÏÂÁÐËĸöÑ¡ÏîÖУ¬ÊôÓÚ¹ú¼Êµ¥Î»ÖÆÖлù±¾µ¥Î»µÄÊÇ
A£®m | B£®N | C£®J | D£®W |
ÏÂÁм¼ÊõÓ¦ÓÃÖУ¬²»ÊÇÀûÓõç´Å²¨¹¤×÷µÄÊÇ
A£®ÀûÓÃ΢²¨À×´ï¸ú×Ù·ÉÐÐÄ¿±ê |
B£®ÀûÓÃÉùÄÅϵͳ̽²âº£µ×Éî¶È |
C£®ÀûÓñ±¶·µ¼º½ÏµÍ³½øÐж¨Î»ºÍµ¼º½ |
D£®ÀûÓÃÒƶ¯Í¨ÐÅÆÁ±ÎÆ÷ÆÁ±ÎÊÖ»úÐźŠ|