ÌâÄ¿ÄÚÈÝ

£¨2011?ºþ±±¶þÄ££©Ä³Í¬Ñ§Éè¼ÆÁËÒ»¸ö²â¶¨ÓÍÆáÅçǹÏòÍâÅçÉäÓÍÆáÎíµÎËٶȵÄʵÑ飮Ëû²ÉÓÃͼ£¨1£©ËùʾµÄ×°Ö㬸ÃÓÍÆáÅçǹÄܹ»ÏòÍâÅçÉäËÄÖÖËٶȴóС²»Í¬µÄÓÍÆáÎíµÎ£¬Ò»¸öÖ±¾¶ÎªDµÄÖ½´ø»·£¬°²·ÅÔÚÒ»¸ö¿ÉÒÔ°´ÕÕÒ»¶¨×ªËÙת¶¯µÄ¹Ì¶¨×ªÌ¨ÉÏ£¬Ö½´ø»·ÉÏ¿ÌÓÐÒ»ÌõÏÁ·ìA£¬ÔÚÏÁ·ìAµÄÕý¶ÔÃæ»­Ò»Ìõ±êÖ¾Ïߣ¬ÔÚת̨¿ªÊ¼×ª¶¯´ïµ½Îȶ¨½ÇËٶȦØʱ£¬Ïò²àÃæͬÑù¿ªÓÐÏÁ·ìBµÄÖ½ºÐÖÐÅçÉäÓÍÆáÎíµÎ£¬µ±ÏÁ·ìAתÖÁ¿¿½üÏÁ·ìBÇÒÓë֮ƽÐÐÕý¶Ôʱ£¬ÎíµÎ±ãͨ¹ýÏÁ·ìAÔÚÖ½´øµÄÄÚ²àÃæÁôϺۼ££®¸Ä±äÅçÉäËÙ¶ÈÖظ´ÊµÑ飬ÔÚÖ½´øÉÏÁôÏÂһϵÁеĺۼ£a¡¢b¡¢c¡¢d£®½«Ö½´ø´Óת̨ÉÏÈ¡ÏÂÀ´£¬Õ¹¿ªÆ½·ÅÔڿ̶ȳßÅԱߣ¬Èçͼ£¨2£©Ëùʾ£¬Èç¹û²»¼ÆÎíµÎËùÊܵÄÖØÁ¦ºÍ¿ÕÆø×èÁ¦£®

£¨1£©ÓÃvmin±íʾËÄ´ÎʵÑéÖÐÓÍÆáÎíµÎµÄ×îСËٶȣ¬ÈôÒª±£Ö¤ËÄ´ÎʵÑéÎíµÎ¶¼ÔÚÖ½´ø»·×ª¶¯°ëȦµÄʱ¼äÄÚ´ïµ½Ö½´ø»·£¬ÔòÖ½´ø»·×ª¶¯µÄ½ÇËٶȦØÓ¦Âú×ãµÄÌõ¼þÊÇ£º
¦Ø=
vmin¦Ð
D
¦Ø=
vmin¦Ð
D
£®
£¨2£©ÔÚÂú×㣨1£©µÄÌõ¼þÏ£¬ÈôD=40cm£¬¦Ø=2.4rad/s£¬ÓÉͼ£¨b£©¿ÉÖªËÄ´ÎʵÑéÖÐÅçÉäËÙ¶È×î´óµÄÎíµÎËÙ¶Èvmax=
32
32
m/s£®
·ÖÎö£º£¨1£©ÓÍÆáÎíµÎ½øÈëÏÁ·ìAºóÑØÖ±ÏßÔÈËÙÔ˶¯µ½Ö½´ø»·ÉÏ£¬ÈôÖ½´ø»·²»×ª£¬ÔòÓÍÆáÎíµÎÒ»¶¨´òÔÚ±êÖ¾ÏßÉÏ£¬ÈôÖ½´ø»·ÒÔijһ½ÇËÙ¶Èת¶¯£¬ÔòÓÍÆáÎíµÎÑØÖ±Ïßµ½´ïÖ½´ø»·Ê±£¬±êÖ¾ÏßÔÚÓÍÆáÎíµÎÔ˶¯µ½Ö½´ø»·ÉϵÄÕâ¶Îʱ¼äÄÚ»áת¹ýÒ»¶¨½Ç¶È¦È£»ÔÚÓÍÆáÎíµÎËÙ¶ÈÒ»¶¨µÄÇé¿öÏ£¬ÓÍÆáÎíµÎµ½´ïÖ½´ø»·µÄʱ¼ätÒ²ÊÇÒ»¶¨µÄ£®ËùÒÔÔÚÒ»¶¨Ê±¼äÄÚ¦ØÔ½´ó£¬Ö½´ø»·µÄλÖõ½±êÖ¾ÏߵľàÀë¾ÍÔ¶£»Èô¦Ø×ã¹»´ó£¬ÔòÔÚÏÁ·ìAת¹ý°ëȦµÄʱ¼äÀÓÍÆáÎíµÎ¸ÕºÃÒ²µ½´ïÖ½´ø»·£¬ËùÒÔÓУºt=
¦Ð
¦Ø
=
D
vmin
£»ËùÒÔÓЦØmax=
¦Ðvmin
D
£¬ËùÒÔ£¬ÒªÔÚÓÍÆáÎíµÎµ½´ïÖ½´ø»·Ê±ÏÁ·ìAת¹ýµÄ½Ç¶ÈСÓڦУ¬ËùÒÔֻҪתË٦أ¼¦Ømax¼´¿É£®
£¨2£©ÔÚÖ½´ø»·×ªËÙ¦ØÒ»¶¨µÄÇé¿öÏ£¬ÓÍÆáÎíµÎËÙ¶ÈÔ½´ó£¬µ½´ïÖ½´ø»·µÄʱ¼ätÔ½¶Ì£¬Ôò±êÖ¾Ïßת¹ýµÄ½Ç¶È¦ÈԽС£¬×ª¹ýµÄ»¡³¤sÔ½¶Ì£¬ÓÍÆáÎíµÎµ½´ïÖ½´ø»·µÄλÖþàÀë±êÖ¾ÏßÔ½½ü£¬ËùÒÔµ½´ïdµãµÄÓÍÆáÎíµÎÊÇËÙ¶È×î´óµÄ£®ÓÍÆáÎíµÎ×î´óËÙ¶ÈΪvmax£¬ÓÐt=
D
Vmax
=
¦È
¦Ø
£»ÆäÖЦÈ=
s
D
2
=
2s
D
£¬ËùÒÔ
D
vmax
=
2s
D¦Ø
£¬vmax=
¦ØD2
2S
=32m/s
½â´ð£º½â£º£¨1£©ÓÍÆáÎíµÎµ½´ïÖ½´ø»·µÄʱ¼ätΪt=
D
Vmin

ÏÁ·ìAת¶¯°ëÖܵÄʱ¼äΪ£ºt=
¦Ð
¦Ømax
£»
ÓÉ
D
vmin
=
¦Ð
¦Ømax

µÃ¦Ømax=
¦Ðvmin
D
£»
ËùÒÔÒªÈÃÎíµÎÔÚÏÁ·ìAת¹ý°ëȦǰµ½´ïÖ½´ø»·£¬
¹ÊÓ¦ÓЦأ¼
vmin¦Ð
D
£®
£¨2£©¾­·ÖÎöµ½´ïdµãµÄÎíµÎΪËÙ¶È×î´óµÄ£¬ÉèÆäËÙ¶ÈΪvmax 
ÎíµÎµ½´ïÖ½´ø»·µÄʱ¼äΪt=
D
Vmax
£»
ÏÁ·ìBת¹ýµÄ»¡³¤ÎªS£¬×ª¹ýµÄ½Ç¶ÈΪ¦È£¬ÔòÓÐs=¦È¡Á
D
2
£¬¦È=¦Øt£¬
ËùÒÔt=
¦È
¦Ø
=
2s
D
¦Ø
=
2s
D¦Ø
£¬
¹ÊÓÐ
D
vmax
=
2s
D¦Ø
£¬
ËùÒÔvmax=
¦ØD2
2s
=
2.4¡Á0£®42
2¡Á6¡Á10-3
=32m/s£®
µãÆÀ£º±¾ÌâÎïÀíÇé¾°Éè¼ÆÐÂÓ±£¬µ«ÄѶÈÊÊÖУ®Ö¼ÔÚ¿¼²éÔ²ÖÜÔ˶¯Éæ¼°µÄһЩ¸ÅÄî¼°¹«Ê½£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿

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

¾«Ó¢¼Ò½ÌÍø