ÎÒ¹úÊ×ËÒÏÖ´úº½Ä¸¡°ÁÉÄþ¡±ºÅÓÚ2012Äê9Ô£¬½»¸¶ÖйúÈËÃñ½â·Å¾üº£¾ü£¬2012Äê11ÔÂ23ÈÕ½¢ÔØ»ú³É¹¦Ê×½µ¡°ÁÉÄþ¡±ºÅ£®²¢ÔÚ¡°ÁÉÄþ¡±ºÅ³É¹¦Æð·É£®º½Ä¸µÄ·ÉÐмװ峤300m£¬¿í70m£®Èç¹û½¢ÔØ»úÔÚÆð·ÉѵÁ·Ê±£¬º½Ä¸ÕýÒÔ10m/sµÄËÙ¶ÈÔÈËÙº½ÐУ¬½¢ÔØ»ú¶ÔµØÆð·ÉËÙ¶ÈÖÁÉÙÒª´ïµ½70m/s£¬²ÅÄÜÆð·É£¬¼ÙÉè¼×°åÊÇˮƽµÄ£¬Ôò½¢ÔØ»úÔÚ¼×°åÉÏÔȼÓËÙÔ˶¯µÄ¼ÓËÙ¶ÈÖÁÉÙΪ¶à´ó£¿£¨¡¡¡¡£©
·ÖÎö£º½áºÏ½¢ÔØ»úºÍº½Ä¸µÄλÒƹØϵ£¬½áºÏÔ˶¯Ñ§¹«Ê½Çó³öÔ˶¯µÄʱ¼ä£¬´Ó¶ø¸ù¾ÝËÙ¶Èʱ¼ä¹«Ê½Çó³ö½¢ÔØ»úµÄ¼ÓËٶȣ®
½â´ð£º½â£ºÉè¾­¹ýtʱ¼ä½¢ÔØ»úËٶȴﵽ70m/s£®
Ôò½¢ÔØ»úµÄλÒÆx1=
v
2
t

º½Ä¸µÄλÒÆx2=v1t
Ôò
v
2
t-v1t=L
£¬
´úÈëÊý¾Ý½âµÃt=12s
½áºÏËÙ¶Èʱ¼ä¹«Ê½µÃ£¬½¢ÔØ»úµÄ¼ÓËÙ¶ÈÖÁÉÙΪa=
v
t
=
70
12
¡Ö6m/s2
£®¹ÊDÕýÈ·£¬A¡¢B¡¢C´íÎó£®
¹ÊÑ¡£ºD£®
µãÆÀ£º½â¾ö±¾ÌâµÄ¹Ø¼üÕÆÎÕÔȱäËÙÖ±ÏßÔ˶¯µÄÔ˶¯Ñ§¹«Ê½ºÍÍÆÂÛ£¬²¢ÄÜÁé»îÔËÓã®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

2013Äê1ÔÂ26ÈÕ£¬ÖйúÊ×ËÒº£¾üº½Ä¸¡°ÁÉÄþ½¢¡±½ðÒø¼ÍÄî±ÒÔÚºÓÄÏÁÁÏ࣬ÈçͼËùʾ£®¾ÝÁ˽⺽ĸÔÚË®Öк½ÐÐʱÊܵ½Ë®µÄ×èÁ¦ÓëÔËÐÐËٶȵÄÁ¢·½³ÉÕý±È£¬¼´f=kv3£¬kÊÇ×èÁ¦ÒòÊý£®¼ÙÉè¡°ÁÉÄþ½¢¡±4̨TB-12ÕôÆûÂÖ»úµÄ×ܹ¦ÂÊΪP0£¬º½ÐеÄ×î´óËÙ¶ÈΪvm£¬ÔòÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º²»Ïê ÌâÐÍ£ºµ¥Ñ¡Ìâ

2013Äê1ÔÂ26ÈÕ£¬ÖйúÊ×ËÒº£¾üº½Ä¸¡°ÁÉÄþ½¢¡±½ðÒø¼ÍÄî±ÒÔÚºÓÄÏÁÁÏ࣬ÈçͼËùʾ£®¾ÝÁ˽⺽ĸÔÚË®Öк½ÐÐʱÊܵ½Ë®µÄ×èÁ¦ÓëÔËÐÐËٶȵÄÁ¢·½³ÉÕý±È£¬¼´f=kv3£¬kÊÇ×èÁ¦ÒòÊý£®¼ÙÉè¡°ÁÉÄþ½¢¡±4̨TB-12ÕôÆûÂÖ»úµÄ×ܹ¦ÂÊΪP0£¬º½ÐеÄ×î´óËÙ¶ÈΪvm£¬ÔòÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£®×èÁ¦ÒòÊý²»±ä£¬·¢¶¯»úµÄ¹¦ÂÊÔö´óµ½2P0£¬º½ÐÐ×î´óËÙ¶ÈΪ2vm
B£®·¢¶¯»ú¹¦Âʲ»±ä£¬Ê¹×èÁ¦ÒòÊý¼õСµ½
k
16
£¬º½ÐÐ×î´óËÙ¶ÈΪ2v
C£®ÈôҪʹº½Ä¸ÔȼÓËÙº½ÐУ¬Ôò·¢¶¯»úÐèÌṩºã¶¨µÄ¶¯Á¦
D£®ÈôҪʹº½Ä¸ÔȼÓËÙº½ÐУ¬Ôò·¢¶¯»úÐèÌṩËæʱ¼ä¾ùÔÈÔö¼ÓµÄ¶¯Á¦
¾«Ó¢¼Ò½ÌÍø

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

¡¡¡¡ ÓÉÔ­ËÕÁª½¨ÔìµÄÍßÁ¼¸ñºÅº½¿Õĸ½¢£¬¾­ÎÒ¹ú¸ÄÔìÖؽ¨£¬ÓÚ2012Äê9Ô¸üÃûΪÁÉÄþºÅ£¬½»¸¶ÖйúÈËÃñ½â·Å¾üº£¾ü£¬³ÉΪÖйúµÚÒ»ËÒÏÖ´úº½Ä¸£¬Îª½¨Á¢Ò»Ö§Ç¿´óµÄÉîÀ¶º£¾üʵÏÖÁËÒ»´Î´ó¿çÔ½¡£ÁÉÄþ½¢½¢³¤304Ã×£¬½¢¿í70.5Ã×£¬½¢Ê×»¬Ô¾Ê½Æð·É¼×°åÑö½ÇΪ14 0£¬×î¸ßº½ËÙ32½Ú(1½ÚÔ¼µÈÓÚ0.5m/s)¡£2012Äê11ÔÂ25ÈÕ£¬·ÉÐÐÔ±´÷Ã÷Ã˼ÝÊ»ÎÒ¹ú×ÔÐÐÑÐÖƵıàºÅΪ552µÄ¼ß-15½¢ÔØ»úÔÚº½Ä¸¡°ÁÉÄþ½¢¡±Éϳɹ¦×Ž¢²¢Æð·É£¬ÔÙÒ»´Î±íÃ÷ÎÒ¹úµÄº£·ÀÁ¦Á¿µÃµ½½øÒ»²½µÄÌáÉý¡£¼ß£­15½¢ÔØÕ½¶·»ú·¢¶¯»úµÄÍÆÁ¦¿É´ï132ǧţ£¬×î¸ßËٶȿɴï2.4ÂíºÕ£¨1ÂíºÕÏ൱ÓÚ330m/s£©¡£

¡¡ Èç¹û¼ß-15½¢ÔØ»úÔÚº½Ä¸Æð·Éʱ·¢¶¯»úµÄÍÆÁ¦Îª1.3¡Á10 5N£¬º½Ä¸¼×°åÓÐЧ»¬ÐÐˮƽÅܵÀ³¤250m£¨²»°üÀ¨»¬Ô¾Ê½¼×°åµÄ³¤¶È£©,·É»úµÄ×ÜÖÊÁ¿Îª2.4¡Á10 4kg£¬·É»úÀ뽢ʱµÄËÙÂÊ´ïµ½50m/s, ·É»úͨ¹ý»¬Ô¾Ê½Æð·É¼×°åʱËٶȴóС²»±ä¡£

£¨1£©·É»úÆð·Éʱ£¬ÁÉÄþ½¢¾²Ö¹ÔÚº£ÃæÉÏ£¬·É»úÔÚ¼×°åÉÏÆð·Éˮƽ»¬ÐÐʱËùÊܵÄ×èÁ¦Îª¶à´ó£¨Éè×èÁ¦´óС²»±ä£©£¿

£¨2£©Èç¹û·É»úÆð·ÉʱÏà¶Ô½¢µÄËÙÂʲ»±ä£¬ÁÉÄþ½¢ÕýÒÔ20½ÚµÄËÙÂÊÑØ·É»úÆð·ÉµÄ·½Ïòº½ÐУ¬ÄÇô£¬·É»úÀ뽢ʱµÄËٶȷ½ÏòÓëˮƽ·½Ïò¼ÐÈñ½ÇµÄÕýÇÐֵΪ¶à´ó£¿£¨¼ÆËã½á¹û±£ÁôÈýλÓÐЧÊý×Ö¡££©£¨sin140=0.2419,cos140 =0.9703.£©

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º2013Äê¸ß¿¼ÎïÀí¸´Ï°¾íC£¨Î壩£¨½âÎö°æ£© ÌâÐÍ£ºÑ¡ÔñÌâ

2013Äê1ÔÂ26ÈÕ£¬ÖйúÊ×ËÒº£¾üº½Ä¸¡°ÁÉÄþ½¢¡±½ðÒø¼ÍÄî±ÒÔÚºÓÄÏÁÁÏ࣬ÈçͼËùʾ£®¾ÝÁ˽⺽ĸÔÚË®Öк½ÐÐʱÊܵ½Ë®µÄ×èÁ¦ÓëÔËÐÐËٶȵÄÁ¢·½³ÉÕý±È£¬¼´f=kv3£¬kÊÇ×èÁ¦ÒòÊý£®¼ÙÉè¡°ÁÉÄþ½¢¡±4̨TB-12ÕôÆûÂÖ»úµÄ×ܹ¦ÂÊΪP£¬º½ÐеÄ×î´óËÙ¶ÈΪvm£¬ÔòÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨ £©

A£®×èÁ¦ÒòÊý²»±ä£¬·¢¶¯»úµÄ¹¦ÂÊÔö´óµ½2P£¬º½ÐÐ×î´óËÙ¶ÈΪ2vm
B£®·¢¶¯»ú¹¦Âʲ»±ä£¬Ê¹×èÁ¦ÒòÊý¼õСµ½£¬º½ÐÐ×î´óËÙ¶ÈΪ2v
C£®ÈôҪʹº½Ä¸ÔȼÓËÙº½ÐУ¬Ôò·¢¶¯»úÐèÌṩºã¶¨µÄ¶¯Á¦
D£®ÈôҪʹº½Ä¸ÔȼÓËÙº½ÐУ¬Ôò·¢¶¯»úÐèÌṩËæʱ¼ä¾ùÔÈÔö¼ÓµÄ¶¯Á¦

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸