ÌâÄ¿ÄÚÈÝ
11£®Ò»Áмòгºá²¨ÑØxÖáÕý·½Ïò´«²¥£¬Ä³Ê±¿Ì£¨t=0£©Æ䲨ÐÎÈçͼËùʾ£¬a¡¢b¡¢c¡¢dÊÇËĸöÖʵ㣬Õñ·ùΪA£®ÏÂÁÐ˵·¨ÖÐÕýÈ·µÄÊÇ£¨¡¡¡¡£©A£® | ¸Ãʱ¿ÌÒÔºó£¬Öʵãa±ÈÖʵãbÏȵ½´ïƽºâλÖà | |
B£® | ¸Ãʱ¿ÌÒÔºóµÄ$\frac{1}{4}$ÖÜÆÚÄÚ£¬Öʵãdͨ¹ýµÄ·³ÌµÈÓÚA | |
C£® | ¸Ãʱ¿ÌÒÔºóµÄ$\frac{1}{4}$ÖÜÆÚÄÚ£¬ÖʵãaÑز¨µÄ´«²¥·½ÏòÒƶ¯1m | |
D£® | ¸Ãʱ¿ÌÒÔºóµÄ$\frac{1}{4}$ÖÜÆÚÄÚ£¬Öʵãbͨ¹ýµÄ·³Ì±ÈÖʵãcͨ¹ýµÄ·³Ì´ó |
·ÖÎö ¸ù¾Ý²¨´«²¥·½ÏòÅжÏa¡¢bµÄÕñ¶¯·½Ïò£¬ÔÙ·ÖÎö»Øµ½Æ½ºâλÖõÄÏȺ󣮸ù¾ÝÖÊÔªËٶȹØϵ£¬ÅжϸÃʱ¿ÌÒÔºóµÄ$\frac{1}{4}$ÖÜÆÚÄÚ£¬Í¨¹ý·³ÌµÄ´óС£®¸Ãʱ¿ÌÒÔºóµÄ$\frac{1}{4}$ÖÜ˹ÄÚ£¬ÖÊÔªdͨ¹ýµÄ·³ÌµÈÓÚA£®
½â´ð ½â£ºA¡¢¼òгºá²¨ÑØxÖáÕý·½Ïò´«²¥£¬Í¼Ê¾Ê±¿ÌÖÊÔªa¡¢b¾ùÑØyÖáÕý·½ÏòÔ˶¯£¬ÖÊÔªa±ÈÖÊÔªb³Ùµ½´ïƽºâλÖ㮹ÊA´íÎó£®
B¡¢´Ëʱ¿ÌdÔÚ²¨·å£¬¸Ãʱ¿ÌÒÔºóµÄ$\frac{1}{4}$ÖÜÆÚÄÚ£¬dµ½´ïƽºâλÖã¬Í¨¹ýµÄλÒÆ´óСµÈÓÚA£®¹ÊBÕýÈ·£®
C¡¢ÖÊÔªaÖ»×Ô¼ºÆ½ºâλÖø½½üÉÏÏÂÕñ¶¯£¬¹ÊC´íÎó£®
D¡¢Í¼Ê¾Ê±¿ÌbÏòƽºâλÖÃÔ˶¯£¬ËÙ¶ÈÔö´ó£¬cÏò²¨¹ÈÔ˶¯£¬ËٶȼõС£¬ËùÒÔ¸Ãʱ¿ÌÒÔºóµÄ$\frac{1}{4}$ÖÜÆÚÄÚ£¬ÖÊÔªbͨ¹ýµÄ·³Ì±ÈÖÊÔªcͨ¹ýµÄ·³Ì´ó£®¹ÊDÕýÈ·£®
¹ÊÑ¡£ºBD
µãÆÀ ¸ù¾Ý²¨µÄ´«²¥·½ÏòÅжÏÖʵãµÄÕñ¶¯·½ÏòÊÇ»ù±¾ÄÜÁ¦£®Ö»Óд¦ÓÚƽºâλÖûò×î´óλÒÆ´¦Öʵ㣬¾¹ý$\frac{1}{4}$ÖÜÆÚʱ¼äʱͨ¹ýµÄ·³Ì²ÅµÈÓÚA£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿
1£®Ô˶¯Ô±ÊÖ³ÖÍøÇòÅÄÍÐÇòÑØˮƽÃæÔȼÓËÙÅÜ£¬ÉèÇòÅĺÍÇòÖÊÁ¿·Ö±ðΪM¡¢mÇòÅÄƽÃæºÍˮƽÃæÖ®¼äµÄ¼Ð½ÇΪ¦È£¬ÇòÅÄÓëÇò±£³ÖÏà¶Ô¾²Ö¹£¬ËüÃǼäĦ²Á¼°¿ÕÆø×èÁ¦²»¼Æ£¬Ôò£¨¡¡¡¡£©
A£® | Ô˶¯Ô±µÄ¼ÓËÙ¶ÈΪgcot¦È | |
B£® | ÇòÅĶÔÇòµÄ×÷ÓÃÁ¦$\frac{mg}{cos¦È}$ | |
C£® | Ô˶¯Ô±¶ÔÇòÅĵÄ×÷ÓÃÁ¦ÎªMgcos¦È | |
D£® | Èô¼ÓËٶȴóÓÚgsin¦È£¬ÇòÒ»¶¨ÑØÇòÅÄÏòÉÏÔ˶¯ |
16£®´ÓÅ£¶ÙµÚ¶þ¶¨ÂÉÖªµÀ£¬ÎÞÂÛÔõÑùСµÄÁ¦¶¼¿ÉÒÔʹÎïÌå²úÉú¼ÓËٶȣ®¿ÉÊǵ±ÎÒÃÇÓÃÒ»¸öºÜСµÄˮƽÁ¦È¥ÍƺÜÖصÄ×À×Óʱ£¬È´ÍƲ»¶¯Ëü£¬ÕâÊÇÒòΪ£¨¡¡¡¡£©
A£® | Å£¶ÙµÚ¶þ¶¨Âɲ»ÊÊÓÃÓÚ¾²Ö¹ÎïÌå | |
B£® | ×À×ӵļÓËٶȺÜС£¬ËÙ¶ÈÔöÁ¿ºÜС£¬ÑÛ¾¦²»ÈÝÒ×¾õ²ìµ½ | |
C£® | ÍÆÁ¦Ð¡ÓÚ×î´ó¾²Ä¦²ÁÁ¦£¬¼ÓËÙ¶ÈÊǸºÖµ | |
D£® | ×À×ÓËùÊܵĺÏÁ¦µÈÓÚÁ㣬Òò¶ø¼ÓËÙ¶ÈÒ²µÈÓÚÁ㣬ËùÒÔÔÀ´¾²Ö¹µÄ×À×Ó»¹ÊǾ²Ö¹µÄ |