ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾ£¬Ò»ÖÊÁ¿Îª1kgµÄ»¬¿éÔÚÇã½ÇΪ30¡ãµÄбÃæÉÏ£¬´ÓaµãÓɾ²Ö¹¿ªÊ¼Ï»¬£¬µ½bµã½Ó´¥µ½Ò»¸öÇᵯ»É£¬»¬¿éѹËõµ¯»Éµ½cµã¿ªÊ¼µ¯»Ø£¬²âµÃcµãµ¯»ÉµÄµ¯ÐÔÊÆÄÜΪ6J£¬ab=1m£¬bc=0.2m£¬g=10m/s2£¬ÄÇôÔÚa¡úcµÄÕâÒ»¹ý³ÌÖУ¨¡¡¡¡£©
A£®»¬¿éµÄ¶¯ÄÜÔÚcµã×î´ó |
B£®»¬¿éÖØÁ¦ÊÆÄܼõÉÙÁË6J |
C£®»¬¿éºÍµ¯»ÉϵͳµÄ»úеÄÜÊغã |
D£®»¬¿é¿Ë·þµ¯»ÉµÄµ¯Á¦×öÁË-6JµÄ¹¦ |
A¡¢»¬¿éѹËõµ¯»Éµ½cµã¿ªÊ¼µ¯»Ø£¬ËµÃ÷cµãËÙ¶ÈΪÁ㣬¹ÊA´íÎó£»
B¡¢´Óaµ½cµÄ¹ý³ÌÖУ¬ÖØÁ¦×ö¹¦ÎªWG=mgh=10¡Á1.2¡Á
=6J£¬ËùÒÔ»¬¿éÖØÁ¦ÊÆÄܼõÉÙÁË6J£¬¹ÊBÕýÈ·£»
C¡¢´Óaµ½cµÄ¹ý³ÌÖУ¬»¬¿éÖØÁ¦ÊÆÄܼõÉÙÁË6J£¬cµãµ¯»ÉµÄµ¯ÐÔÊÆÄÜΪ6J£¬¶¯ÄÜûÓб䣬ÖØÁ¦ÊÆÄܵļõСÁ¿µÈÓÚµ¯ÐÔÊÆÄܵÄÔö¼ÓÁ¿£¬ÏµÍ³»úеÄÜÊغ㣬¹ÊCÕýÈ·£»
D¡¢µ¯»ÉµÄµ¯ÐÔÊÆÄÜÔö¼Ó6J£¬»¬¿é¿Ë·þµ¯»ÉµÄµ¯Á¦×öÁË6JµÄ¹¦£¬¹ÊD´íÎó£»
¹ÊÑ¡£ºBC£®
B¡¢´Óaµ½cµÄ¹ý³ÌÖУ¬ÖØÁ¦×ö¹¦ÎªWG=mgh=10¡Á1.2¡Á
1 |
2 |
C¡¢´Óaµ½cµÄ¹ý³ÌÖУ¬»¬¿éÖØÁ¦ÊÆÄܼõÉÙÁË6J£¬cµãµ¯»ÉµÄµ¯ÐÔÊÆÄÜΪ6J£¬¶¯ÄÜûÓб䣬ÖØÁ¦ÊÆÄܵļõСÁ¿µÈÓÚµ¯ÐÔÊÆÄܵÄÔö¼ÓÁ¿£¬ÏµÍ³»úеÄÜÊغ㣬¹ÊCÕýÈ·£»
D¡¢µ¯»ÉµÄµ¯ÐÔÊÆÄÜÔö¼Ó6J£¬»¬¿é¿Ë·þµ¯»ÉµÄµ¯Á¦×öÁË6JµÄ¹¦£¬¹ÊD´íÎó£»
¹ÊÑ¡£ºBC£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿