ÌâÄ¿ÄÚÈÝ
2£®ÀûÓÃÆøµæµ¼¹ìÑéÖ¤»úеÄÜÊغ㶨ÂÉ£¬ÊµÑé×°ÖÃÈçͼ¼×Ëùʾ£®½«Æøµæµ¼¹ìˮƽ·ÅÖã¬ÔÚÆøµæµ¼¹ìÉÏÏà¸ôÒ»¶¨¾àÀë°²×°Á½¸ö¹âµçÃÅAºÍB£¬»¬¿éÉϹ̶¨ÓÐÕÚ¹âÌõ£¬Í¨¹ýÊý×Ö¼ÆʱÆ÷£¨Í¼ÖÐδ»³ö£©¿ÉÒÔ·Ö±ð¶Á³öÕÚ¹âÌõͨ¹ý¹âµçÃÅAºÍ¹âµçÃÅBËùÓõÄʱ¼ä¡÷t1ºÍ¡÷t2£»¢Ù¿ªÊ¼ÊµÑéÇ°£¬½«»¬¿é£¨²»¹Ò¹³Â룩ÖÃÓÚÆøµæµ¼¹ìÉÏ£¬ÇáÍÆ»¬¿é£¬Èô²âµÃ¡÷t1ºÍ¡÷t2Âú×ã¡÷t1=¡÷t2¹Øϵ£¬Ôò˵Ã÷Æøµæµ¼¹ìÒѾˮƽ
¢ÚÓÃÓα꿨³ß²âÁ¿ÕÚ¹âÌõµÄ¿í¶Èd£¬½á¹ûÈçͼÒÒËùʾ£¬Óɴ˶Á³öd=2.55mm£»
¢ÛÓÃϸÏßͨ¹ýÆøµæµ¼¹ìÓҶ˵Ķ¨»¬ÂÖ½«»¬¿éÓëÖÊÁ¿ÎªmµÄ¹³ÂëÏàÁ¬£¬½«»¬¿éÓÉͼÖÐλÖÃÊÍ·Å£¬Èô¡÷t1¡¢¡÷t2¡¢ÕÚ¹âƬ¿í¶ÈdÒѲâ³ö£¬¹³ÂëÖÊÁ¿mÒÑÖª£¬ÒªÑéÖ¤»úеÄÜÊغ㣬»¹Ðè²â³öµÄÎïÀíÁ¿ÊÇ»¬¿éµÄÖÊÁ¿M£¬Á½¹âµçÃżäµÄ¾àÀëL£¨Ð´³öÎïÀíÁ¿µÄÃû³Æ¼°·ûºÅ£©£¬ÈôÉÏÊöÎïÀíÁ¿¼äÂú×ã¹Øϵʽ$mgL=\frac{1}{2}£¨M+m£©{£¨\frac{d}{{¡÷{t_2}}}£©^2}-\frac{1}{2}£¨M+m£©{£¨\frac{d}{{¡÷{t_1}}}£©^2}$£¬Ôò±íÃ÷ÔÚ»¬¿éºÍ¹³ÂëµÄÔ˶¯ÖУ¬ÏµÍ³µÄ»úеÄÜÊغ㣮
·ÖÎö £¨1£©Èç¹ûÕÚ¹âÌõͨ¹ý¹âµçÃŵÄʱ¼äÏàµÈ£¬ËµÃ÷ÕÚ¹âÌõ×öÔÈËÙÔ˶¯£¬¼´ËµÃ÷Æøµæµ¼¹ìÒѾˮƽ£®
£¨2£©ÕÆÎÕÓα꿨³ß¶ÁÊýµÄ·½·¨£¬Ö÷³ß¶ÁÊý¼ÓÉÏÓαê¶ÁÊý£¬²»Ðè¹À¶Á£®
£¨3£©ÒªÑéÖ¤»¬¿éºÍíÀÂë×é³ÉµÄϵͳ»úеÄÜÊÇ·ñÊغ㣬¾ÍÓ¦¸ÃÈ¥Çó³ö¶¯ÄܵÄÔö¼ÓÁ¿ºÍÖØÁ¦ÊÆÄܵļõСÁ¿£¬¸ù¾ÝÕâÁ½¸öÁ¿Çó½â£®
£¨4£©»¬¿éºÍíÀÂë×é³ÉµÄϵͳ»úеÄÜÊغãÁгö¹Øϵʽ£®
½â´ð ½â£º£¨1£©Èç¹ûÕÚ¹âÌõͨ¹ý¹âµçÃŵÄʱ¼äÏàµÈ£¬ËµÃ÷ÕÚ¹âÌõ×öÔÈËÙÔ˶¯£¬¼´ËµÃ÷Æøµæµ¼¹ìÒѾˮƽ£®
£¨2£©Óα꿨³ßµÄÖ÷³ß¶ÁÊýΪ£º0.2cm=2mm£¬Óαê³ßÉϵÚ11¸ö¿Ì¶ÈºÍÖ÷³ßÉÏijһ¿Ì¶È¶ÔÆ룬
ËùÒÔÓαê¶ÁÊýΪ11¡Á0.05mm=0.55mm£¬ËùÒÔ×îÖÕ¶ÁÊýΪ£º2mm+0.55mm=2.55mm£®
£¨3£©ÒªÑéÖ¤»¬¿éºÍíÀÂë×é³ÉµÄϵͳ»úеÄÜÊÇ·ñÊغ㣬¾ÍÓ¦¸ÃÈ¥Çó³ö¶¯ÄܵÄÔö¼ÓÁ¿ºÍÖØÁ¦ÊÆÄܵļõСÁ¿£¬
¹âµçÃŲâÁ¿Ë²Ê±ËÙ¶ÈÊÇʵÑéÖг£Óõķ½·¨£®ÓÉÓÚ¹âµçÃŵĿí¶ÈºÜС£¬ËùÒÔÎÒÃÇÓúܶÌʱ¼äÄÚµÄƽ¾ùËٶȴúÌæ˲ʱËٶȣ®
vB=$\frac{d}{¡÷{t}_{2}}$£¬vA=$\frac{d}{¡÷{t}_{1}}$
»¬¿éºÍíÀÂë×é³ÉµÄϵͳ¶¯ÄܵÄÔö¼ÓÁ¿¡÷Ek=$\frac{1}{2}$£¨m+M£©£¨$\frac{d}{¡÷{t}_{2}}$£©2-$\frac{1}{2}$£¨m+M£©£¨$\frac{d}{¡÷{t}_{1}}$£©2£®
»¬¿éºÍíÀÂë×é³ÉµÄϵͳ¶¯ÄܵÄÖØÁ¦ÊÆÄܵļõСÁ¿¡÷Ep=mgL
ËùÒÔ»¹Ó¦²â³ö»¬¿éÖÊÁ¿M£¬Á½¹âµçÃżä¾àÀëL£®
£¨4£©Èç¹ûϵͳ¶¯ÄܵÄÔö¼ÓÁ¿µÈÓÚϵͳÖØÁ¦ÊÆÄܵļõСÁ¿£¬ÄÇô»¬¿éºÍíÀÂë×é³ÉµÄϵͳ»úеÄÜÊغ㣮
¼´£º$mgL=\frac{1}{2}£¨M+m£©{£¨\frac{d}{{¡÷{t_2}}}£©^2}-\frac{1}{2}£¨M+m£©{£¨\frac{d}{{¡÷{t_1}}}£©^2}$£»
¹Ê´ð°¸Îª£º¢Ù¡÷t1=¡÷t2£»¢Ú2.55£» ¢Û»¬¿éµÄÖÊÁ¿M£¬Á½¹âµçÃżäµÄ¾àÀëL£»$mgL=\frac{1}{2}£¨M+m£©{£¨\frac{d}{{¡÷{t_2}}}£©^2}-\frac{1}{2}£¨M+m£©{£¨\frac{d}{{¡÷{t_1}}}£©^2}$£®
µãÆÀ ÕÆÎÕÓα꿨³ßµÄ¹¤×÷ÔÀí£¬¼°¶ÁÊý·½·¨£®
Á˽â¹âµçÃŲâÁ¿Ë²Ê±ËٶȵÄÔÀí£®
ʵÑéÖÐÎÒÃÇÒªÇå³þÑо¿¶ÔÏóºÍÑо¿¹ý³Ì£¬¶ÔÓÚϵͳÎÒÃÇÒª¿¼ÂÇÈ«Ã森
ÍäµÀ°ë¾¶r£¨m£© | 660 | 330 | 220 | 165 | 132 | 110 |
ÄÚÍâ¹ì¸ß¶È²îh£¨mm£© | 50 | 100 | 150 | 200 | 250 | 300 |
£¨2£©ÒÑÖªÎÒ¹úÌú·ÄÚÍâ¹ìµÄ¼ä¾àÉè¼ÆֵΪL=1435mm£¬Ëã³öÎÒ¹ú»ð³µµÄתÍäËٶȴóС£»
£¨3£©µ±Ò»½ÚÖÊÁ¿M=100tµÄ³µÏáÒÔv=72km/h£¬ÔÚr=440mÍäµÀ´¦¹ÕÍäʱ£¬Çó³ö»ð³µ³µÂÖÖ®¼ä²àÏò¼·Ñ¹Á¦FNµÄ´óС£®
A£® | ¿ÕÆøÖеķÊÔíÅݳÊÏÖÎåÑÕÁùÉ«ÊǹâµÄÉ«É¢ÏÖÏó | |
B£® | Ò»Êøµ¥É«¹âÓÉ¿ÕÆøбÉäÈëË®ÖÐʱ£¬ÆµÂʲ»±ä£¬²¨³¤±äС£¬´«²¥ËٶȱäС | |
C£® | Ò»Êø¸´ºÏ¹âÓÉË®ÖÐбÉäÈë¿ÕÆøʱ£¬ÔÚË®Öд«²¥ËÙ¶ÈÔ½´óµÄµ¥É«¹âÔ½ÈÝÒ×·¢ÉúÈ«·´Éä | |
D£® | Èúì¹âºÍ×Ϲâ·Ö±ðͨ¹ýͬһµ¥·ìÑÜÉä×°ÖÃʱ£¬¾ùÄܲúÉúµÈ¼ä¾àµÄÃ÷°µÏà¼äÌõÎÆ£¬ÇÒºì¹âµÄÌõÎƼä¾à½Ï´ó |
A£® | ÔÚÖÐÐÔÃæʱ£¬Í¨¹ýÏßȦµÄ´ÅͨÁ¿×î´ó | |
B£® | ÔÚÖÐÐÔÃæʱ£¬¸ÐÓ¦µç¶¯ÊÆ×î´ó | |
C£® | ÔÚÒ»¸öÖÜÆÚÄÚµçÁ÷µÄ·½Ïò¸Ä±äÁ½´Î | |
D£® | ´©¹ýÏßȦµÄ´ÅͨÁ¿ÎªÁãʱ£¬´ÅͨÁ¿µÄ±ä»¯ÂÊҲΪÁã |
A£® | ¼×Êǵçѹ»¥¸ÐÆ÷£¬ÊäµçÏßÁ½¶ËµçѹÊÇ2.2¡Á105V | |
B£® | ÒÒÊǵçѹ»¥¸ÐÆ÷£¬ÊäµçÏßÁ½¶ËµçѹÊÇ2.2¡Á103 V | |
C£® | ¼×ÊǵçÁ÷»¥¸ÐÆ÷£¬Í¨¹ýÊäµçÏߵĵçÁ÷ÊÇ100A | |
D£® | ÒÒÊǵçÁ÷»¥¸ÐÆ÷£¬Í¨¹ýÊäµçÏߵĵçÁ÷ÊÇ0.01A |
A£® | СÇòÔÚa¡¢bλÖõļÓËٶȿÉÄÜÏàͬ | B£® | СÇòÓÉaÔ˶¯µ½b¹ý³Ì»úеÄÜÊغã | ||
C£® | ³¡Ç¿´óС¹Øϵһ¶¨ÊÇEa£¼Eb | D£® | µçÊƹØϵһ¶¨ÊǦÕa£¾¦Õb |
A£® | µçÔ´µÄÄÚ×èΪ$\frac{2}{3}$¦¸ | |
B£® | °ÑµÆÅÝL1»»³ÉL2£¬L2¿ÉÄÜÕý³£·¢¹â | |
C£® | °ÑµÆÅÝL1»»³ÉL2£¬µçÔ´µÄÊä³ö¹¦ÂÊ¿ÉÄÜÏàµÈ | |
D£® | °ÑµÆÅÝL1»»³ÉL2£¬µçÔ´µÄÊä³ö¹¦ÂÊÒ»¶¨±äС |