ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿Ò»³¤Ä¾°å¾²Ö¹ÔÚÇã½ÇΪ¦È µÄбÃæÉÏ,³¤Ä¾°åÉÏÒ»ÈËÓÃÁ¦ÍƳ¤Ä¾°åÉÏÎï¿é,ʹÎï¿éÓ볤ľ°å¼äµÄĦ²ÁÁ¦¸ÕºÃΪÁã,ÒÑÖªÈË¡¢Îï¿é¡¢³¤Ä¾°åµÄÖÊÁ¿¾ùΪm,ÈË¡¢Îï¿éÓ볤ľ°å¼äµÄ¶¯Ä¦²ÁÒòÊýΪ¦Ì1,³¤Ä¾°åÓëбÃæ¼äµÄ¶¯Ä¦²ÁÒòÊýΪ¦Ì2,ÔòÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ( )
A. бÃæ¶Ô³¤Ä¾°åµÄĦ²ÁÁ¦Îªmgsin
B. бÃæ¶Ô³¤Ä¾°åµÄĦ²ÁÁ¦Îª3¦Ì2mgcos
C. ³¤Ä¾°å¶ÔÈ˵ÄĦ²ÁÁ¦Îª2mgsin
D. ³¤Ä¾°å¶ÔÈ˵ÄĦ²ÁÁ¦Îª2¦Ì1mgcos
¡¾´ð°¸¡¿C
¡¾½âÎö¡¿ÊÔÌâ·ÖÎö£ºÏȶÔÕûÌå½øÐÐÊÜÁ¦·ÖÎö£¬¸ù¾ÝƽºâÌõ¼þ¿ÉÃ÷ȷĦ²ÁÁ¦µÄ´óС£¬ÔÙ¶ÔÈ˺ÍÎï¿éÕûÌå½øÐзÖÎö£¬¸ù¾ÝƽºâÌõ¼þ¿ÉÇóµÃÈËÊܵ½µÄĦ²ÁÁ¦´óС£®
¶ÔÈË£¬Îï¿é£¬³¤Ä¾°åÈýÕßÕûÌåÑо¿£¬Ð±Ãæ¶ÔËüÃǵÄĦ²ÁÁ¦Îª¾²Ä¦²ÁÁ¦£¬Æä´óСΪ£¬¹ÊAB´íÎ󣻶ÔÈË£¬Îï¿éÕûÌåÑо¿£¬ÓÉÓÚÎï¿éÓ볤ľ°å¼äµÄĦ²ÁÁ¦¸ÕºÃΪÁ㣬Òò´Ë³¤Ä¾°å¶ÔÈ˵ľ²Ä¦²ÁÁ¦´óСΪ£¬¹ÊCÕýÈ·D´íÎó£®
¡¾ÌâÄ¿¡¿Í¼Ëùʾ£¬±ÕºÏ¿ª¹Ø£¬¸Ä±äR1×èÖµ£¬ÔÚ±í2ÖмÇϼ¸×éµçÁ÷±í¡¢µçѹ±íµÄ¶ÁÊý¡£Í¼ÒÑ×÷³öR2µÄU-IͼÏß¡£
µçÁ÷/A | 0.1 | 0.3 | 0.4 | 0.5 |
µçѹ/V | 2.5 | 1.5 | 1.0 | 0.5 |
£¨1£©ÇóR2µÄ×èÖµ_______¡£
£¨2£©¸ù¾Ý±íÊý¾ÝÔÚͼÖÐÃèµã²¢Á¬Ïß_______¡£
£¨3£©µçÁ÷±íʾÊýΪ0.2Aʱ£¬µçѹUDB=___________¡¢µçѹUEF=____________¡£
£¨4£©µçÁ÷±íʾÊýΪ0.4Aʱ£¬µçѹ±íUDF= _______,Çó50sÄÚR1¡¢R2ÏûºÄµÄ×ܵçÄÜ________¡£