ÌâÄ¿ÄÚÈÝ
6£®Ë®Æ½ÃæÉϾ²Ö¹·ÅÖÃÒ»ÖÊÁ¿Îªm=0.2kgµÄÎï¿é£¬¹Ì¶¨ÔÚͬһˮƽÃæÉϵÄСÐ͵綯»úͨ¹ýˮƽϸÏßÇ£ÒýÎï¿é£¬Ê¹Îï¿éÓɾ²Ö¹¿ªÊ¼×öÔȼÓËÙÖ±ÏßÔ˶¯£¬2ÃëÄ©µ½´ï¶î¶¨¹¦ÂÊ£¬Æäv-tͼÏßÈçͼËùʾ£¬Îï¿éÓëˮƽÃæ¼äµÄ¶¯Ä¦²ÁÒòÊýΪ¦Ì=0.1£¬g=10m/s2£¬µç¶¯»úÓëÎï¿é¼äµÄ¾àÀë×ã¹»Ô¶£¬Ç󣺣¨1£©Îï¿é×öÔȼÓËÙÖ±ÏßÔ˶¯Ê±Êܵ½µÄÇ£ÒýÁ¦´óС£»
£¨2£©µç¶¯»úµÄ¶î¶¨¹¦ÂÊ£»
£¨3£©Îï¿éÔڵ綯»úÇ£ÒýÏ£¬×îÖÕÄÜ´ïµ½µÄ×î´óËٶȣ®
·ÖÎö £¨1£©¸ù¾ÝͼÏóÖª¼ÓËٶȣ¬¸ù¾ÝÅ£¶ÙÔ˶¯¶¨ÂÉ֪ǣÒýÁ¦£»
£¨2£©¸ù¾ÝP=FVÇó¶î¶¨¹¦ÂÊ£»
£¨3£©µ±F=fʱ£¬Ëٶȴï×î´ó£¬vm=$\frac{P}{f}$£®
½â´ð ½â£º£¨1£©¸ù¾ÝͼÏóÖªÔȼÓËٵļÓËÙ¶ÈΪa=$\frac{0.4}{1}$m/s2=0.4m/s2
f=¦Ìmg=0.1¡Á0.2¡Á10=0.2N
¸ù¾ÝF=f+ma=0.2+0.2¡Á0.4=0.28N
£¨2£©2sÄ©µç¶¯»ú´ïµ½¶î¶¨¹¦ÂÊP=Fv2=0.28¡Á0.8=0.224W
£¨3£©µ±F=fʱ£¬Ëٶȴï×î´ó£¬vm=$\frac{P}{f}$=$\frac{0.224}{0.2}$m/s=1.12m/s
´ð£º£¨1£©Îï¿é×öÔȼÓËÙÖ±ÏßÔ˶¯Ê±Êܵ½µÄÇ£ÒýÁ¦´óСΪ0.28N£»
£¨2£©µç¶¯»úµÄ¶î¶¨¹¦ÂÊΪ0.224W£»
£¨3£©Îï¿éÔڵ綯»úÇ£ÒýÏ£¬×îÖÕÄÜ´ïµ½µÄ×î´óËÙ¶ÈΪ1.12m/s£®
µãÆÀ ±¾Ì⽫¹¦Âʹ«Ê½ÓëÅ£¶ÙµÚ¶þ¶¨ÂÉ×ÛºÏÓ¦Ó㬵±¼ÓËÙ¶ÈΪÁãʱ£¬Ç£ÒýÁ¦Óë×èÁ¦ÏàµÈ£¬ËÙ¶È×î´ó£®¼´Ê¹¼ÓËٶȱ仯£¬Ò²¿ÉÒÔÓÉÅ£¶ÙµÚ¶þ¶¨ÂÉÀ´±í´ï³öËÙ¶ÈÓë¼ÓËٶȵĹØϵ£®×¢ÒâÆû³µÓÐÁ½ÖÖÆô¶¯£¬Ò»ÊǼÓËٶȺ㶨£¬Ôò¹¦ÂÊÔÚ²»¶ÏÔö¼Ó£¬¶þÊǹ¦Âʺ㶨£¬Ôò¼ÓËٶȲ»¶Ï±ä»¯£®
A£® | ÏßȦÖиÐÓ¦µçÁ÷µÄ·½ÏòΪABCDA | |
B£® | ÏßȦÖеĸÐÓ¦µç¶¯ÊÆΪ2nBL2¦Ø | |
C£® | ´©¹ýÏßȦµÄ´ÅͨÁ¿µÄ±ä»¯ÂÊ×î´ó | |
D£® | ÏßȦAD±ßËùÊÜ°²ÅàÁ¦µÄ´óСΪ$\frac{{n}^{2}{B}^{2}{L}_{1}{L}_{2}¦Ø}{R}$£¬·½Ïò´¹Ö±Ö½ÃæÏòÀï |
A£® | ¦Á¡¢¦ÂºÍ¦ÃÈýÖÖÉäÏßÖУ¬¦ÃÉäÏߵĴ©Í¸ÄÜÁ¦×îÇ¿ | |
B£® | ·ÅÉäÐÔÔªËصİëË¥ÆÚÓëÍâ½çµÄζÈÎÞ¹Ø | |
C£® | ·ÅÉäÐÔÔªËØÓë±ðµÄÔªËØÐγɻ¯ºÏÎïʱÈÔ¾ßÓзÅÉäÐÔ | |
D£® | ËùÓÐÔªËض¼ÓпÉÄÜ·¢ÉúË¥±ä | |
E£® | Ò»¸öÔ×ÓºËÔÚÒ»´ÎË¥±äÖпÉͬʱ·Å³ö¦Á¡¢¦ÂºÍ¦ÃÈýÖÖÉäÏß |
A£® | СÇò·µ»Ø¹ìµÀºóÄÜÑعìµÀÒ»Ö±Ô˶¯£¬²¢ÉÏÉýµ½Nµã | |
B£® | СÇò·µ»Ø¹ìµÀºóÑعìµÀÔ˶¯¿ÉÄܵ½²»ÁËCµã | |
C£® | СÇò·µ»Ø¹ìµÀºóÑعìµÀÔ˶¯µ½Cµãʱ£¬ËÙ¶ÈÒ»¶¨´óÓÚÁã | |
D£® | Èô½«Ð¡Çò´ÓNµã¾²Ö¹ÊÍ·Å£¬ÔòСÇòÇ¡ÄÜÔ˶¯µ½×ó¶Ë¿ÚA´¦ |
A£® | ÎïÌåËùÊÜÖØÁ¦×öµÄ¹¦Îªmgh | |
B£® | ºãÁ¦FÓëĦ²ÁÁ¦µÄºÏÁ¦×ö¹¦Îªmgh | |
C£® | ÎïÌåËùÊܵÄÖ§³ÖÁ¦ÓëĦ²ÁÁ¦µÄºÏÁ¦×ö¹¦Îªmgh | |
D£® | ÎïÌåËùÊܸ÷Á¦µÄºÏÁ¦×ö¹¦Îªmgh |
A£® | AµãµçÊƵÍÓÚBµãµçÊÆ | |
B£® | PÔÚÓÉAÏòCÔ˶¯µÄ¹ý³ÌÖУ¬µçÊÆÄÜÒ»Ö±Ôö´ó | |
C£® | ÔÚBµãPËùÊܵĻ¬¶¯Ä¦²ÁÁ¦µÈÓÚ¿âÂØÁ¦ | |
D£® | ´ÓBµ½CµÄ¹ý³ÌÖУ¬PµÄ¶¯ÄÜÈ«²¿×ª»¯ÎªµçÊÆÄÜ |