ÌâÄ¿ÄÚÈÝ
1£®ÓÐÒ»¿é³¤·½Ìåľ°å±»¾â³ÉÈçͼËùʾµÄA¡¢BÁ½¿é·ÅÔÚˮƽ×ÀÃæÉÏ£¬A¡¢B½ô¿¿ÔÚÒ»Æð£¬Ä¾¿éAµÄ½Ç¶ÈÈçͼËùʾ£®ÏÖÓÃˮƽ·½ÏòµÄÁ¦F´¹Ö±ÓÚ°åµÄ×ó±ßÍÆľ°åB£¬Ê¹Á½¿é°åA¡¢B±£³ÖÔÀ´ÐÎ×´ÕûÌåÑØÁ¦FµÄ·½ÏòÔÈËÙÔ˶¯£¬Ôò£¨¡¡¡¡£©A£® | ľ¿éAÔÚˮƽÃæÄÚÊÜÈý¸öÁ¦µÄ×÷Ó㬺ÏÁ¦ÎªÁã | |
B£® | ľ°åAÖ»ÊÜÒ»¸öĦ²ÁÁ¦ | |
C£® | ľ°åB¶ÔAµÄѹÁ¦Ð¡ÓÚ×ÀÃæ¶Ôľ°åAµÄĦ²ÁÁ¦ | |
D£® | ľ°åBÔÚˮƽÃæÄÚÊÜÈý¸öÁ¦µÄ×÷Óà |
·ÖÎö Á½¿éľ°åÔÚˮƽÃæ×öÔÈËÙÔ˶¯£¬ºÏÁ¦¾ùΪÁ㣬¸ù¾ÝƽºâÌõ¼þ·ÖÎöÊÜÁ¦Çé¿ö£¬·ÖÎöµÄ½á¹û±ØÐëÂú×ãÌõ¼þ£®
½â´ð ½â£ºAB¡¢¶Ôľ°åA·ÖÎöÊÜÁ¦Çé¿ö£ºÄ¾°åAˮƽÃæÊܵ½Ë®Æ½ÃæÏò×óµÄ»¬¶¯Ä¦²ÁÁ¦f£¬BµÄµ¯Á¦NBAºÍĦ²ÁÁ¦fBA£¬ºÏÁ¦ÎªÁ㣬¼´ÖªÄ¾°åAÊÜÁ½¸öĦ²ÁÁ¦£¬¹ÊAÕýÈ·£¬B´íÎó£®
C¡¢ÓÉͼ¿É֪ľ°åB¶ÔAµÄѹÁ¦Ð¡ÓÚ×ÀÃæ¶Ôľ°åAµÄĦ²ÁÁ¦£®¹ÊCÕýÈ·£®
D¡¢Ä¾°åBÔÚˮƽÃæÄÚÊܵ½AµÄµ¯Á¦ºÍĦ²ÁÁ¦£¬Ë®Æ½ÃæµÄĦ²ÁÁ¦ºÍÍÆÁ¦F£¬¹²ËĸöÁ¦µÄ×÷Ó㮹ÊD´íÎó£®
¹ÊÑ¡£ºAC
µãÆÀ ·ÖÎöÊÜÁ¦Ò»°ã°´ÖØÁ¦¡¢µ¯Á¦ºÍĦ²ÁÁ¦Ë³Ðò½øÐУ¬Òª·Àֹ©Á¦£¬¿ÉÒÔÔËÓÃƽºâÌõ¼þ½øÐмìÑ飮
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿
6£®ÈçͼËùʾ£¬ÈËÖØMg=600 N£¬Ä¾°åÖØmg=400N£¬ÈËÓëľ°å¡¢Ä¾°åÓëµØÃæ¼ä¶¯Ä¦²ÁÒòÊý½ÔΪ0.2£¬ÏÖÔÚÈËÓÃˮƽÁ¦FÀÉþ£¬Ê¹ËûÓëľ°åÒ»ÆðÏòÓÒÔÈËÙÔ˶¯£¬Ôò£¨¡¡¡¡£©
A£® | ÈËÊܵ½µÄĦ²ÁÁ¦ÊÇ120 N | B£® | ÈËÀÉþµÄÁ¦ÊÇ100 N | ||
C£® | È˵ĽŸøľ°åµÄĦ²ÁÁ¦Ïò×ó | D£® | ľ°å¸øµØÃæµÄĦ²ÁÁ¦Ïò×ó |
10£®Ò»ÏäÆ»¹ûÔÚÇã½ÇΪ¦ÈµÄбÃæÉÏÔÈËÙÏ»¬£¬ÒÑÖªÏä×ÓÓëбÃæ¼äµÄ¶¯Ä¦²ÁÒòÊýΪ¦Ì£¬ÔÚÏ»¬¹ý³ÌÖд¦ÓÚÏä×ÓÖмäµÄÖÊÁ¿ÎªmµÄÆ»¹ûÊܵ½ÆäËûÆ»¹û¶ÔËüµÄ×÷ÓÃÁ¦´óСºÍ·½ÏòΪ£¨¡¡¡¡£©
A£® | mgsin¦È¡¡ÑØбÃæÏòÏ | B£® | mgcos¦È¡¡´¹Ö±Ð±ÃæÏòÉÏ | ||
C£® | mg¡¡ÊúÖ±ÏòÉÏ | D£® | $\sqrt{1+{¦Ì}^{2}}$mg¡¡ÑØбÃæÏòÉÏ |