ijͬѧΪÁ˲ⶨÆøµæµ¼¹ìÉÏ»¬¿éµÄ¼ÓËٶȣ¬ËûÔÚ»¬¿éÉÏ°²×°ÁË¿í¶ÈΪ2cmµÄÕÚ¹â°å£¬ÈçͼËùʾ£®È»ºóËûÀûÓÃÆøµæµ¼¹ìºÍÊý×ÖºÁÃë¼Æ¼Ç¼ÁËÕÚ¹â°åͨ¹ýµÚÒ»¸ö¹âµçÃÅËùÓõÄʱ¼äΪ¡÷t1=0.20s£¬Í¨¹ýµÚ¶þ¸ö¹âµçÃŵÄʱ¼äΪ¡÷t2=0.10s£¬ÕÚ¹â°å´Ó¿ªÊ¼ÕÚסµÚÒ»¸ö¹âµçÃŵ½¿ªÊ¼ÕÚסµÚ¶þ¸ö¹âµçÃŵÄʱ¼äΪ2.50s£¬ÇëÄã¸ù¾ÝÉÏÃæËûͨ¹ýʵÑéµÃµ½µÄÊý¾Ý£¬Çó£º
£¨1£©»¬¿ìͨ¹ýÁ½¸ö¹âµçÃÅʱµÄËÙ¶Èv1ºÍv2£»
£¨2£©»¬¿éµÄ¼ÓËÙ¶Èa£»
£¨3£©µÚÒ»¸ö¹âµçÃŵ½µÚ¶þ¸ö¹âµçÃÅÖ®¼äµÄ¾àÀëL£®
·ÖÎö£º¸ù¾Ý˲ʱËٶȵĸÅÄîÇó³ö»¬¿éͨ¹ýÁ½¸ö¹âµçÃÅʱµÄËٶȣ¬È»ºóÔÙ¸ù¾Ý¼ÓËٶȵĶ¨Òå¼´¿ÉÇó½â£®
ÔÙ¸ù¾ÝÔ˶¯Ñ§¹«Ê½Çó½âµÚÒ»¸ö¹âµçÃŵ½µÚ¶þ¸ö¹âµçÃÅÖ®¼äµÄ¾àÀ룮
½â´ð£º½â£º£¨1£©¸ù¾ÝÕÚ¹âÌõͨ¹ý¹âµçÃŵÄËٶȿÉÒÔÓÃƽ¾ùËٶȴúÌæµÃ
ͨ¹ýµÚÒ»¸ö¹âµçÃŵÄËÙ¶È
v1=
d
¡÷t1
=
0.02
0.20
=0.1m/s
ͨ¹ýµÚ¶þ¸ö¹âµçÃŵÄËÙ¶È
v2=
d
¡÷t2
=
0.02
0.10
=0.2m/s
£¨2£©¸ù¾Ý¼ÓËٶȵĶ¨Òåʽa=
¡÷v
¡÷t
£¬
»¬¿éµÄ¼ÓËÙ¶ÈΪ£ºa=
0.2-0.1
2.5
=0.04m/s2
£¨3£©¸ù¾ÝÔ˶¯Ñ§ÍÆÂ۵ãº
µÚÒ»¸ö¹âµçÃŵ½µÚ¶þ¸ö¹âµçÃÅÖ®¼äµÄ¾àÀëL=
v1+v2
2
t
=0.375m
´ð£º£¨1£©»¬¿ìͨ¹ýÁ½¸ö¹âµçÃÅʱµÄËÙ¶Èv1ºÍv2·Ö±ðÊÇ0.1m/sºÍ0.2m/s£®
£¨2£©»¬¿éµÄ¼ÓËÙ¶ÈÊÇ0.04m/s2£»
£¨3£©µÚÒ»¸ö¹âµçÃŵ½µÚ¶þ¸ö¹âµçÃÅÖ®¼äµÄ¾àÀëÊÇ0.375m£®
µãÆÀ£º±¾Ì⿼²é¼ÓËٶȵļÆË㹫ʽ£¬¹Ø¼üÊǸù¾ÝÌõ¼þÇó³ö»¬¿éͨ¹ýÁ½¸ö¹âµçÃŵÄ˲ʱËٶȣ¬¸ù¾Ý¼ÓËٶȶ¨ÒåÇó½â£¬»ù´¡Ì⣮
Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

ijͬѧΪÁ˲ⶨÆøµæµ¼¹ìÉÏ»¬¿éµÄ¼ÓËٶȣ¬ËûÔÚ»¬¿éÉÏ°²×°ÁË¿í¶Èd=2cmµÄÕÚ¹â°å£®È»ºóËûÀûÓÃÆøµæµ¼¹ìºÍÊý×ÖºÁÃë¼Æ¼Ç¼ÁËÕÚ¹â°åͨ¹ýµÚÒ»¸ö¹âµçÃÅËùÓõÄʱ¼äΪ¡÷t1=0.1s£¬Í¨¹ýµÚ¶þ¸ö¹âµçÃŵÄʱ¼ä¡÷t2=0.05s£¬ÕÚ¹â°å´Ó¿ªÊ¼ÕÚסµÚÒ»¸ö¹âµçÃŵ½¿ªÊ¼ÕÚסµÚ¶þ¸ö¹âµçÃŵÄʱ¼äΪt=2.00s£¬ÇëÄã¸ù¾ÝÉÏÃæËûͨ¹ýʵÑéµÃµ½µÄÊý¾Ý£¬ÎªËû¼ÆËã³ö»¬¿éµÄ¼ÓËٶȣ®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

ijͬѧΪÁ˲ⶨÆøµæµ¼¹ìÉÏ»¬¿éµÄ¼ÓËٶȣ¬ËûÔÚ»¬¿éÉÏ°²×°ÁË¿í¶ÈΪ2cmµÄÕÚ¹â°å£®È»ºóËûÀûÓÃÆøµæµ¼¹ìºÍÊýÖµºÁÃë¼Æ¼Ç¼ÁËÕÚ¹â°åͨ¹ýµÚÒ»¸ö¹âµçÃÅËùÓõÄʱ¼äΪ¡÷t1=0.31s£¬Í¨¹ýµÚ¶þ¸ö¹âµçÃŵÄʱ¼ä¡÷t2=0.13s£¬ÕÚ¹â°å´Ó¿ªÊ¼ÕÚסµÚÒ»¸ö¹âµçÃŵ½¿ªÊ¼ÕÚסµÚ¶þ¸ö¹âµçÃŵÄʱ¼äΪ3.0s£¬ÇëÄã¸ù¾ÝÉÏÃæËûͨ¹ýʵÑéµÃµ½µÄÊý¾Ý£¬ÎªËû¼ÆËã³ö»¬¿éµÄ¼ÓËٶȣ®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º2010ÄêÕã½­Ê¡º¼ÖÝÊÐÎ÷ºþ¸ß¼¶ÖÐѧ¸ßÒ»ÉÏѧÆÚµÚÒ»´ÎÔ¿¼ÎïÀíÊÔÌâ ÌâÐÍ£º¼ÆËãÌâ

ijͬѧΪÁ˲ⶨÆøµæµ¼¹ìÉÏ»¬¿éµÄ¼ÓËٶȣ¬ËûÔÚ»¬¿éÉÏ°²×°ÁË¿í¶ÈΪ2cmµÄÕÚ¹â°å¡£È»ºóËûÀûÓÃÆøµæµ¼¹ìºÍÊýÖµºÁÃë¼Æ¼Ç¼ÁËÕÚ¹â°åͨ¹ýµÚÒ»¸ö¹âµçÃÅËùÓõÄʱ¼äΪ¦¤t1=0.20s,ͨ¹ýµÚ¶þ¸ö¹âµçÃŵÄʱ¼ä¦¤t2=0.10s,ÕÚ¹â°å´Ó¿ªÊ¼ÕÚסµÚÒ»¸ö¹âµçÃŵ½¿ªÊ¼ÕÚסµÚ¶þ¸ö¹âµçÃŵÄʱ¼äΪ2.50s,ÇëÄã¸ù¾ÝÉÏÃæËûͨ¹ýʵÑéµÃµ½µÄÊý¾Ý,
£¨1£©¼ÆËã³ö»¬¿éµÄͨ¹ýÁ½¸ö¹âµçÃŵĻ¬¿éµÄËÙ¶ÈV1ºÍV2.£¿
£¨2£©¼ÆË㻬¿éµÄ¼ÓËٶȣ¿

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º2010ÄêÕã½­Ê¡º¼ÖÝÊиßÒ»ÉÏѧÆÚµÚÒ»´ÎÔ¿¼ÎïÀíÊÔÌâ ÌâÐÍ£º¼ÆËãÌâ

ijͬѧΪÁ˲ⶨÆøµæµ¼¹ìÉÏ»¬¿éµÄ¼ÓËٶȣ¬ËûÔÚ»¬¿éÉÏ°²×°ÁË¿í¶ÈΪ2cmµÄÕÚ¹â°å¡£È»ºóËûÀûÓÃÆøµæµ¼¹ìºÍÊýÖµºÁÃë¼Æ¼Ç¼ÁËÕÚ¹â°åͨ¹ýµÚÒ»¸ö¹âµçÃÅËùÓõÄʱ¼äΪ¦¤t1=0.20s,ͨ¹ýµÚ¶þ¸ö¹âµçÃŵÄʱ¼ä¦¤t2=0.10s,ÕÚ¹â°å´Ó¿ªÊ¼ÕÚסµÚÒ»¸ö¹âµçÃŵ½¿ªÊ¼ÕÚסµÚ¶þ¸ö¹âµçÃŵÄʱ¼äΪ2.50s,ÇëÄã¸ù¾ÝÉÏÃæËûͨ¹ýʵÑéµÃµ½µÄÊý¾Ý,

£¨1£©¼ÆËã³ö»¬¿éµÄͨ¹ýÁ½¸ö¹âµçÃŵĻ¬¿éµÄËÙ¶ÈV1ºÍV2.£¿

£¨2£©¼ÆË㻬¿éµÄ¼ÓËٶȣ¿

 

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸