ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾ£¬ÖÊÁ¿Îªm0µÄÌõÐδÅÌúÓëÖÊÁ¿ÎªmµÄÂÁ»·¶¼¾²Ö¹Ôڹ⻬µÄˮƽÃæÉÏ£®ÔÚ¼«¶ÌµÄʱ¼äÄÚ¸øÂÁ»·ÒÔˮƽÏòÓҵijåÁ¿I£¬Ê¹»·ÏòÓÒÔ˶¯£¬ÔÚÒÔºóµÄÔ˶¯ÖУ¬±£³ÖÂÁ»·Æ½ÃæÓë´ÅÌúµÄÖáÏß´¹Ö±ÇÒÂÁ»·Óë´ÅÌúûÓз¢ÉúÅöײ£®ÔòÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£®ÔÚÂÁ»·ÏòÓÒÔ˶¯¹ý³ÌÖдÅÌúÏò×óÔ˶¯ | ||
B£®´ÅÌúÔ˶¯µÄ×î´óËÙ¶ÈΪ
| ||
C£®ÂÁ»·ÔÚÔ˶¯¹ý³ÌÖÐÄܲúÉúµÄÈÈÁ¿Îª
| ||
D£®ÂÁ»·ÔÚÔ˶¯¹ý³ÌÖУ¬¶¯ÄÜ×îСֵΪ
|
A¡¢ÓÉÌâÒâ¿ÉÖª£¬ÂÁ»·ÏòÓÒ×ö¼ÓËٶȼõСµÄ¼õËÙÔ˶¯£¬Ö±µ½Á½ÕßËÙ¶ÈÏàµÈʱ£¬Ïà¶Ô¾²Ö¹£¬Ã»Óдų¡Á¦£¬´Ó¶ø×öÔÈËÙÖ±ÏßÔ˶¯£¬¹ÊA´íÎó£®
B¡¢ÏÔÈ»µ±ÂÁ»·ºÍ´ÅÌúͬËÙʱ£¬ÂÁ»·µÄËÙ¶È×îС£¨´ËʱÂÁ»·µÄ¼ÓËÙ¶ÈΪ0£©
¸ù¾Ý¶¯Á¿Êغ㣬ÓУº
I=£¨m+mo£©Vmin
½â³ö£¬Vmin=
ËùÒÔ£¬ÂÁ»·µÄ×îС¶¯ÄÜΪ£º
m
=
ÏÔÈ»£¬´ÅÌúµÄ×î´óËٶȾÍÊÇÂÁ»·µÄ×îСËٶȣ¬ËùÒÔ£¬BÑ¡Ïî´íÎó¡¢DÕýÈ·£®
C£®ÏµÍ³²úÉúµÄÈÈÁ¿µÈÓÚϵͳµÄ»úеÄܼõÉÙ
ËùÒÔ£¬Q=
-
²»¿ÉÄܵÈÓÚ
£¬·ñÔò£¬¾ÍÊÇ˵ÂÁ»·µÄ»úеÄÜÍêȫת»¯ÎªÈÈÁ¿£¬ÕâÊDz»¿ÉÄܵģ®
ËùÒÔ£¬CÑ¡Ïî´íÎó£®
¹ÊÑ¡D
B¡¢ÏÔÈ»µ±ÂÁ»·ºÍ´ÅÌúͬËÙʱ£¬ÂÁ»·µÄËÙ¶È×îС£¨´ËʱÂÁ»·µÄ¼ÓËÙ¶ÈΪ0£©
¸ù¾Ý¶¯Á¿Êغ㣬ÓУº
I=£¨m+mo£©Vmin
½â³ö£¬Vmin=
I |
m+m0 |
ËùÒÔ£¬ÂÁ»·µÄ×îС¶¯ÄÜΪ£º
1 |
2 |
v | 2min |
mI2 |
2(m+m0)2 |
ÏÔÈ»£¬´ÅÌúµÄ×î´óËٶȾÍÊÇÂÁ»·µÄ×îСËٶȣ¬ËùÒÔ£¬BÑ¡Ïî´íÎó¡¢DÕýÈ·£®
C£®ÏµÍ³²úÉúµÄÈÈÁ¿µÈÓÚϵͳµÄ»úеÄܼõÉÙ
ËùÒÔ£¬Q=
I2 |
2m |
mI2 |
2(m+m0)2 |
²»¿ÉÄܵÈÓÚ
I2 |
2m |
ËùÒÔ£¬CÑ¡Ïî´íÎó£®
¹ÊÑ¡D
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿