ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿ÈçͼËùʾ£¬ÓÃÖÊÁ¿ÎªmµÄ¹³Âëͨ¹ý»¬ÂÖÇ£ÒýС³µ£¬Ê¹ËüÔÚ³¤Ä¾°åÉÏÔ˶¯£¬´òµã¼ÆʱÆ÷ÔÚÖ½´øÉϼÇ¼С³µµÄÔ˶¯Çé¿ö¡£ÀûÓøÃ×°ÖÿÉÍê³É¡°Ì½¾¿¶¯Äܶ¨Àí¡±µÄʵÑé¡£
£¨1£©ÓÐÁ½ÖÖ¹¤×÷ƵÂʾùΪ50HzµÄ´òµã¼ÆʱÆ÷¹©ÊµÑéÑ¡Óãº
A.µç´Å´òµã¼ÆʱÆ÷ B.µç»ð»¨´òµã¼ÆʱÆ÷
Ϊʹֽ´øÔÚÔ˶¯Ê±Êܵ½µÄ×èÁ¦½ÏС£¬Ó¦Ñ¡Ôñ____________£¨Ñ¡Ìî¡°A¡±»ò¡°B¡±£©¡£
£¨2£©ÊµÑéÖУ¬Óù³ÂëµÄÖØÁ¦±íʾºÏÁ¦£¬ÐèҪƽºâĦ²ÁÁ¦ºÍÆäËû×èÁ¦¡£Çë¼òÊö²Ù×÷²½Ö裺_____________________¡£
£¨3£©¼ÙÉèÒѾƽºâÁËĦ²ÁÁ¦ºÍÆäËû×èÁ¦µÄÓ°Ï죬ÈôEk1=£¬Ek2=£¬ÆäÖÐmΪ¹³ÂëÖÊÁ¿£¬MΪС³µÖÊÁ¿£¬mºÍMÊýÖµÏà²î²»¶à£¬vΪ¹³ÂëÏÂÂäµÄËٶȣ¬È¡±íʾ¹³ÂëËÙ¶È×ÔÁãµ½v¹ý³ÌÖÐÖØÁ¦×öµÄ¹¦£¬Ôò´ÓÀíÂÛÉÏ·ÖÎö£¬Í¼ÖÐÕýÈ·µÄÊÇ___________¡£
A. B.
C. D.
¡¾´ð°¸¡¿B Êʵ±µæ¸ß³¤Ä¾°åÓҶˣ¬ÇáÍÆС³µ£¬Ð¡³µ¿ÉÔÈËÙÔ˶¯£¬´òµã¼ÆʱÆ÷´ò³öµÄµã¾ù¾ä·Ö²¼ AD
¡¾½âÎö¡¿
£¨1£©[1]£®µç´Å´òµã¼ÆʱÆ÷ÊÇͨ¹ý»úеÕñ¶¯´òµãµÄ£¬¶øµç»ð»¨´òµã¼ÆʱÆ÷ÊÇͨ¹ýµç»ð»¨À´´òµã£¬Óõç»ð»¨´òµã¼ÆʱÆ÷ÄÜʹֽ´øÔÚÔ˶¯Ê±Êܵ½µÄ×èÁ¦½ÏС£¬Ñ¡B£»
£¨2£©[2]£®Æ½ºâĦ²ÁÁ¦µÄ·½·¨ÊÇ£º°Ñľ°åÒ»¶Ëµæ¸ß£¬ÈÃС³µ»¬Ï£¬µ±Ð¡³µÔÈËÙÔ˶¯Ê±£¬¾ÍÒâζ×ÅĦ²ÁÁ¦µÖÏûÁË£»
£¨3£©[3]£®¹³ÂëÖÊÁ¿²»±ä£¬Í¨¹ý¸Ä±äϽµ¸ß¶È¸Ä±äW£¬ÓÖÒòΪEk1£½mgh=W£¬ÔòAÕýÈ·£¬B´íÎó¡£Èç¹ûʵÑéÖÐÍêÈ«Ïû³ýÁËĦ²ÁÁ¦ºÍÆäËü×èÁ¦£¬ÄÇôÖØÁ¦×öµÄ¹¦¾ÍµÈÓÚÖØ´¸ºÍС³µ¶¯ÄܵÄÔö¼ÓÁ¿£¬mgh=(M+m)v2£¬ËùÒÔEk2ÓëW³ÉÕý±È£¬ÔòC´íÎó£¬DÕýÈ·.