ÌâÄ¿ÄÚÈÝ

¡¾ÌâÄ¿¡¿£¨1£©ÈçͼËùʾ£¬Á½Áмòгºá²¨·Ö±ðÑØxÖáÕý·½ÏòºÍ¸º·½Ïò´«²¥£¬Á½²¨Ô´·Ö±ðλÓÚx£½£­0.2mºÍx£½1.2m´¦£¬´«²¥ËٶȾùΪv0£½0.2m/s£¬Õñ·ù¾ùΪA£½2cm¡£Í¼Ê¾Îªt£½0ʱ¿ÌÁ½Áв¨µÄͼÏñ£¨´«²¥·½ÏòÈçͼËùʾ£©£¬´ËʱƽºâλÖô¦ÓÚx£½0.2mºÍx£½0.8mµÄP¡¢QÁ½Öʵã¸Õ¿ªÊ¼Õñ¶¯¡£ÖʵãMµÄƽºâλÖô¦ÓÚx£½0.5m´¦£¬ÔòÏÂÁÐÅжÏÕýÈ·µÄÊÇ__________ ¡£

A£®Á½Áв¨µÄÖÜÆÚ¾ùΪ2s£¬ÇÒÆðÕñ·½Ïò¾ùÑØyÖḺ·½Ïò

B£®t£½0ʱ¿Ì£¬x=0´¦µÄÖʵ㴦ÓÚƽºâλÖÃÏòyÖáÕý·½ÏòÔ˶¯£¬ x=0.1m´¦µÄÖʵ㴦ÓÚƽºâλÖÃÏòyÖḺ·½ÏòÔ˶¯

C£®t£½1.5s¿Ì֮ǰ£¬ÖʵãMʼÖÕ´¦¾²Ö¹×´Ì¬

D£®Mµã¿ªÊ¼Õñ¶¯ºó×öÕñ·ùΪ4cm£¬ÖÜÆÚΪ4sµÄ¼òгÔ˶¯

E£®T=2.5sʱMµã´¦ÓÚƽºâλÖÃÏòyÖáÕý·½ÏòÔ˶¯

£¨2£©Èçͼ£¬½«°ë¾¶ÎªRµÄ͸Ã÷°ëÇòÌå·ÅÔÚˮƽ×ÀÃæÉÏ·½£¬OΪÇòÐÄ£¬Ö±¾¶Ç¡ºÃˮƽ£¬ÖáÏßOO'´¹Ö±ÓÚˮƽ×ÀÃæ.λÓÚOµãÕýÉÏ·½Ä³Ò»¸ß¶È´¦µÄµã¹âÔ´S·¢³öÒ»ÊøÓëOO'£¬¼Ð½Ç¦È=60¡ãµÄµ¥É«¹âÉäÏò°ëÇòÌåÉϵÄAµã£¬ÒÑ֪͸Ã÷°ëÇòÌå¶Ôµ¥É«¹âµÄÕÛÉäÂÊΪ£¬¹âÔÚÕæ¿ÕÖд«²¥ËÙ¶ÈΪc£¬²»¿¼ÂÇ°ëÇòÌåÄÚ¹âµÄ·´É䣬Çó£º

(i)¹âÏßͨ¹ý°ëÇòÌåºóÉäµ½×ÀÃæÉϵÄλÖÃB£¨Í¼ÖÐδ»­³ö£©µ½O'µÄλÖÃ__________£»

(ii)¸Ã¹âÔÚ°ëÇòÌåÄÚ´«²¥µÄʱ¼ät ___________¡£

¡¾´ð°¸¡¿ACE

¡¾½âÎö¡¿

£¨1£©ÓÉͼ֪²¨³¤¦Ë=0.4m£¬ÓÉ £¬¸Ã²¨µÄÖÜÆÚΪ £¬Óɲ¨µÄ´«²¥·½Ïò¸ù¾Ý²¨ÐÎƽÒÆ·¨¿ÉÅжϳöÖʵãµÄÕñ¶¯·½Ïò£ºÁ½Áмòгºá²¨·Ö±ðÑØxÖáÕý·½ÏòºÍ¸º·½Ïò´«²¥£¬ÔòÖʵãP¡¢QµÄÆðÕñ·½Ïò¾ùÑØyÖḺ·½ÏòÔ˶¯£¬¹ÊAÕýÈ·£»t£½0ʱ¿Ì£¬x=0´¦µÄÖʵ㴦ÓÚƽºâλÖÃÏòyÖáÕý·½ÏòÔ˶¯£¬ x=0.1m´¦µÄÖʵ㴦ÓÚ¸ºÏòλÒÆ×î´óµÄλÖ㬴Ëʱ¿ÌµÄÕñ¶¯ËÙ¶ÈΪÁ㣬ѡÏîB´íÎó£»Á½Áв¨´«µ½MµãËùÐèµÄʱ¼ä £¬¹Êt£½1.5s¿Ì֮ǰ£¬ÖʵãMʼÖÕ´¦¾²Ö¹×´Ì¬£¬Ñ¡ÏîCÕýÈ·£» Mµã¿ªÊ¼Õñ¶¯ºó£¬Á½Áв¨µþ¼ÓÕñ¶¯¼ÓÇ¿£¬¹Ê×öÕñ·ùΪ4cm£¬ÖÜÆÚÈÔΪ2sµÄ¼òгÔ˶¯ £¬Ñ¡ÏîD´íÎó£»Mµã¿ªÊ¼ÆðÕñµÄ·½ÏòÑØyÖḺÏò£¬T=2.5sʱMµãÒѾ­Õñ¶¯ÁË1s=0.5T£¬´Ëʱ´¦ÓÚƽºâλÖÃÏòyÖáÕý·½ÏòÔ˶¯£¬Ñ¡ÏîEÕýÈ·£»¹ÊÑ¡ACE.

£¨2£©£¨i£©¹â´Ó¹âÔ´SÉä³ö¾­°ëÇòÌåµ½´ïˮƽ×ÀÃæµÄ¹â·Èçͼ£®

¹âÓÉ¿ÕÆøÉäÏò°ëÇòÌ壬ÈëÉä½Ç ¦È=60¡ã
°ëÇòÌåµÄÕÛÉäÂÊ£ºn=
ÓÉÕÛÉ䶨ÂÉ£¬ÓÐ
´úÈëÊý¾Ý½âµÃ£º¦Á=30¡ã
¹âÓÉ°ëÇòÉäÈë¿ÕÆø£¬Óɼ¸ºÎ¹Øϵ¿ÉÖª¦Á+¦Â=60¡ã£¬¹ÊÓУº¦Á=¦Â=30¡ã
ÓÖÓÉÕÛÉ䶨ÂÉ£¬ÓÐ

½âµÃÕÛÉä½ÇΪ£º¦Ã=60¡ã
Óɼ¸ºÎ¹Øϵ¿ÉÖª£¬³öÉä¹âÏßƽÐÐÓÚÖáÏßOO¡ä£¬´¹Ö±É䵽ˮƽ×ÀÃæÉϵÄBµã£¬Ôò

£¨ii£©¹âÔÚ°ëÇòÌåÖд«²¥µÄËÙ¶ÈΪ£º
Óɼ¸ºÎ֪ʶµÃ2ACcos30¡ã=R
µÃ£º

ËùÒÔ¹âÔÚ°ëÇòÌåÖд«²¥µÄʱ¼äΪ£º

Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿

Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com

¾«Ó¢¼Ò½ÌÍø