ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿¡°Ì½¾¿¹¦ÓëËٶȱ仯µÄ¹Øϵ¡±µÄʵÑé×°ÖÃÈçÏÂͼËùʾ£¬µ±Ð¡³µÔÚÒ»ÌõÏðƤ½î×÷ÓÃϵ¯³öʱ£¬ÏðƤ½î¶ÔС³µ×öµÄ¹¦¼ÇΪW£»µ±ÓÃ2Ìõ¡¢3Ìõ¡¢4Ìõ¡¡ÍêÈ«ÏàͬµÄÏðƤ½î²¢ÔÚÒ»Æð½øÐеÚ2´Î¡¢µÚ3´Î¡¢µÚ4´Î¡¡ÊµÑéʱ£¬ÏðƤ½î¶ÔС³µ×öµÄ¹¦¼ÇΪ2W¡¢3W¡¢4W¡¡Ã¿´ÎʵÑéÖÐС³µ»ñµÃµÄ×î´óËٶȿÉÓÉ´òµã¼ÆʱÆ÷Ëù´ò³öµÄÖ½´ø²â³ö.
(1)¹ØÓÚ¸ÃʵÑ飬ÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ(¶àÑ¡)_____.
A.ΪÁËƽºâĦ²ÁÁ¦£¬ÊµÑéÖпÉÒÔ½«³¤Ä¾°åµÄÒ»¶ËÊʵ±µæ¸ß£¬Ê¹Ð¡³µÀ×Å´©¹ý´òµã¼ÆʱÆ÷µÄÖ½´ø×ÔÓÉÏ»¬Ê±Äܱ£³ÖÔÈËÙÔ˶¯
B.ʵÑéÒÇÆ÷°²×°Ê±£¬¿ÉÒÔ²»Æ½ºâĦ²ÁÁ¦
C.ÿ´ÎʵÑéС³µ±ØÐë´ÓͬһλÖÃÓɾ²Ö¹µ¯³ö
D.ʵÑéÖÐÒªÏȽÓͨ´òµã¼ÆʱÆ÷µÄµçÔ´ÔÙÊÍ·ÅС³µ
(2)ÏÂͼ¸ø³öÁËij´ÎʵÑé´ò³öµÄÖ½´ø£¬´ÓÖнØÈ¡Á˲âÁ¿Ð¡³µ×î´óËÙ¶ÈËùÓõÄÒ»¶ÎÖ½´ø£¬²âµÃA¡¢B¡¢C¡¢D¡¢EÏàÁÚÁ½µã¼äµÄ¾àÀë·Ö±ðΪAB£½1.48 cm£¬BC£½1.60 cm£¬CD£½1.62 cm£¬DE£½1.62 cm£»ÒÑÖªÏàÁÚÁ½µã´òµãʱ¼ä¼ä¸ôΪ0.02 s£¬ÔòС³µ»ñµÃµÄ×î´óËÙ¶Èvm£½________m/s.(½á¹û±£ÁôÁ½Î»ÓÐЧÊý×Ö)
¡¾´ð°¸¡¿ (1)ACD (2)0.81
¡¾½âÎö¡¿ (1) µ±Ð¡³µÀ×Å´©¹ý´òµã¼ÆʱÆ÷µÄÖ½´ø×öÔÈËÙÔ˶¯Ê±£¬Ñس¤Ä¾°å·½ÏòµÄÖØÁ¦µÄ·ÖÁ¦´óСµÈÓÚĦ²ÁÁ¦£¬¼´ÔÚʵÑéÖпÉÏû³ýĦ²ÁÁ¦µÄÓ°Ï죬AÕýÈ·£»ÊµÑéÒÇÆ÷°²×°Ê±£¬±ØÐëƽºâĦ²ÁÁ¦£¬BÏî´íÎó£»Ã¿´ÎʵÑéС³µ±ØÐë´ÓͬһλÖÃÓɾ²Ö¹µ¯³ö£¬CÏîÕýÈ·£»Ê¹Óôòµã¼ÆʱÆ÷ʱ¶¼±ØÐëÏȽÓͨµçÔ´ÔÙÊÍ·ÅС³µ£¬DÏîÕýÈ·.×ÛÉϱ¾ÌâÑ¡ACD.
(2)С³µ»ñµÃµÄ×î´óËÙ¶Èv£½£½m/s£½0.81 m/s.