ÌâÄ¿ÄÚÈÝ
8£®Í¼£¨¼×£©Îª¡¶ÓÃDISÑо¿»úеÄÜÊغ㶨ÂÉ¡·µÄʵÑ飮£¨1£©£¨¶àÑ¡Ì⣩ÏÂÁÐ˵·¨ÖÐÕýÈ·µÄÊÇ£ºAC
£¨A£©±ØÐë²â¶¨°Ú´¸µÄÖ±¾¶
£¨B£©¶¨Î»µ²Æ¬µÄ×÷ÓÃÊǸıä°Ú´¸µÄ»úеÄÜ
£¨C£©°Ú´¸ÏÂÂäµÄ¸ß¶È¿ÉÓɱê³ßÅÌÖ±½Ó²â¶¨
£¨D£©°Ú´¸Ã¿´Î¶¼±ØÐë´Ó°Ú´¸ÊÍ·ÅÆ÷µÄλÖÃÒÔ²»Í¬µÄËÙ¶ÈÏòÏÂÔ˶¯
£¨2£©Ä³Í¬Ñ§ÊµÑéµÃµ½µÄÊý¾Ý½çÃæÈçͼ£¨ÒÒ£©Ëùʾ£¬Ôò°Ú´¸¾¹ýCµãµÄ»úеÄÜԼΪ0.03J£¬¸ù¾Ý¸÷µãµÄÊý¾Ý·ÖÎö£¬¿ÉÒԵóö½áÂÛ£ºÔÚÖ»ÓÐÖØÁ¦×ö¹¦µÄÇé¿öÏ£¬ÎïÌåµÄ¶¯ÄܺÍÊÆÄÜÏ໥ת»¯£¬µ«»úеÄܵÄ×ÜÁ¿±£³Ö²»±ä£®
·ÖÎö £¨1£©Ã÷ȷʵÑéÔÀíÒÔ¼°¸Ã×°Öõĸ÷¸ö²¿·Ö×÷Óü´¿ÉÕýÈ·½â´ð±¾Ì⣮
£¨2£©Í¨¹ýËù¸øÊý¾Ý¼ÆËã°Ú´¸ÔÚ²»Í¬Î»ÖõĻúеÄÜ£¬ÅжÏÔÚÎó²î·¶Î§ÄÚ»úеÄÜÊÇ·ñÊغ㼴¿É£®
½â´ð ½â£º£¨1£©A¡¢ÎªÁËÇó³ö°ÚÇòͨ¹ý¹âµçÃŵÄËٶȣ¬±ØÐë²âÁ¿Ð¡ÇòµÄÖ±¾¶£¬¹ÊAÕýÈ·£»
B¡¢¶¨Î»µ²Æ¬µÄ×÷ÓÃÊÇÈðڴ¸Í£Ï£¬²¢·Ç¸Ä±äÆä»úеÄÜ£¬¹ÊB´íÎó£»
C¡¢¸ù¾Ý¸Ã×°Öù¹Ôì¿ÉÖª£¬°Ú´¸ÏÂÂäµÄ¸ß¶È¿ÉÓɱê³ßÅÌÖ±½Ó²â¶¨£¬¹ÊCÕýÈ·£»
D¡¢ÎªÁËÑéÖ¤¹ý³ÌÖлúеÄÜÊÇ·ñÊغ㣬ҪÇó°Ú´¸Ã¿´ÎͬͬһλÖþ²Ö¹£¨»òÏàͬËٶȣ©Ï°ڣ¬¹ÊD´íÎó£®
¹ÊÑ¡£ºAC£®
£¨2£©¸ù¾Ý±íÖÐÊý¾Ý£¬°Ú´¸¾¹ýCµãµÄ¶¯ÄÜEk=$\frac{1}{2}m{v}_{c}^{2}$=$\frac{1}{2}¡Á0.02¡Á1.4{1}^{2}$=0.02J£»
¶øÖØÁ¦ÊÆÄÜEp=mgh=0.02¡Á10¡Á0.05=0.01J
Òò´ËCµãµÄ»úеÄÜE=Ek+Ep=0.03J£»
ͬÀí£¬¿ÉÒÔ¼ÆËã³ö°Ú´¸ÔÚA¡¢B¡¢DÈýµãµÄ»úеÄÜ·Ö±ðΪ£º0.0297J¡¢0.0299J¡¢0.0296J£¬
¹Ê¸÷µã»úеÄÜ´óС»ù±¾Ò»Ö£®
¹ÊµÃ³öµÄ½áÂÛÊÇ£ºÔÚÖ»ÓÐÖØÁ¦×ö¹¦µÄÇé¿öÏ£¬ÎïÌåµÄ¶¯ÄܺÍÊÆÄÜÏ໥ת»¯£¬µ«»úеÄܵÄ×ÜÁ¿±£³Ö²»±ä£®
¹Ê´ð°¸Îª£º£¨1£©AC£»
£¨2£©0.03J£¬ÔÚÖ»ÓÐÖØÁ¦×ö¹¦µÄÇé¿öÏ£¬ÎïÌåµÄ¶¯ÄܺÍÊÆÄÜÏ໥ת»¯£¬µ«»úеÄܵÄ×ÜÁ¿±£³Ö²»±ä£®
µãÆÀ ÑéÖ¤»úеÄÜÊغãµÄ·½·¨ºÜ¶à£¬µ«ÊÇÆäÔÀíÊÇÒ»ÑùµÄ£¬Òò´ËÃ÷ȷʵÑéÔÀíÊǽâ¾öʵÑéµÄ¹Ø¼ü£®
A£® | ΪÁËÔö¼ÓÎïÌåµÄÄÚÄÜ£¬Ö»ÄܶÔÎïÌå×ö¹¦£¬´Ó¶øÏòËü´«µÝÈÈÁ¿ | |
B£® | ²»¿ÉÄÜʹÈÈÁ¿´ÓµÍÎÂÎïÌå´«Ïò¸ßÎÂÎïÌå | |
C£® | ¹¦×ª±äΪÈȵÄʵ¼Êºê¹Û¹ý³ÌÊDz»¿ÉÄæµÄ | |
D£® | ÎïÌåµÄ·Ö×ÓÊÆÄÜÖ»ÓëÎïÌåµÄÌå»ýÓÐ¹Ø |
A£® | ÈËÔìµØÇòÎÀÐÇ×îСÔËÐÐËÙ¶ÈÊÇ7.9km/s | |
B£® | ËùÓеØÇòͨѶÎÀÐǶ¼Î»ÓÚµØÇò³àµÀƽÃæÉÏ | |
C£® | ¾µäÁ¦Ñ§ÄܽâÊÍÒ»ÇÐ΢¹ÛÁ£×ÓÔ˶¯µÄ¹æÂÉ | |
D£® | Ïà¶ÔÂÛÈÏΪͬһ¹ý³ÌµÄλÒƺÍʱ¼äµÄ²âÁ¿ÔÚ²»Í¬²Î¿¼ÏµÖÐÊDz»Í¬µÄ |
A£® | Å£¶Ù´´Á¢ÁË΢»ý·Ö | B£® | ·¨ÀµÚ×îÔç·¢ÏÖÁ˵çÁ÷µÄ´ÅЧӦ | ||
C£® | ¿âÂØ×îÏÈ׼ȷ²â³öÁ˵ç×ӵĵçÁ¿ | D£® | ÑÇÀïÊ¿¶àµÂÊ×ÏÈÌá³öÁ˹ßÐԵĸÅÄî |
A£® | ïÑ241Éä³öµÄÊǦÁÁ£×Ó£¬ÓÐÑÌÎíʱµçÁ÷ÔöÇ¿ | |
B£® | ïÑ241Éä³öµÄÊǦÁÁ£×Ó£¬ÓÐÑÌÎíʱµçÁ÷¼õÈõ | |
C£® | ïÑ241Éä³öµÄÊǦÂÁ£×Ó£¬ÓÐÑÌÎíʱµçÁ÷ÔöÇ¿ | |
D£® | ïÑ241Éä³öµÄÊǦÂÁ£×Ó£¬ÓÐÑÌÎíʱµçÁ÷¼õÈõ |
A£® | ·¢Éú¹âµçЧӦʱ£¬ÈëÉä¹âԽǿ£¬¹â×ÓµÄÄÜÁ¿¾ÍÔ½´ó | |
B£® | ²»Í¬½ðÊô²úÉú¹âµçЧӦµÄÈëÉä¹âµÄ×îµÍƵÂÊÊÇÏàͬµÄ | |
C£® | ½ðÊôÄÚµÄÿ¸öµç×Ó¿ÉÒÔÎüÊÕÒ»¸ö»òÒ»¸öÒÔÉϵĹâ×Ó£¬µ±Ëü»ýÀ۵Ķ¯ÄÜ×ã¹»´óʱ£¬¾ÍÄÜ·¢Éú¹âµçЧӦ | |
D£® | Èç¹ûÈëÉä¹â×ÓµÄÄÜÁ¿Ð¡ÓÚ½ðÊô±íÃæµÄµç×Ó¿Ë·þÔ×Ӻ˵ÄÒýÁ¦¶øÒݳöʱËùÐè×öµÄ×îС¹¦£¬±ã²»ÄÜ·¢Éú¹âµçЧӦ |
A£® | µ±ÈëÉä½Ç¦ÂÊʵ±¼õСʱ£¬¹âÏßc¡¢d¶¼¿ÉÄÜ»áÏûʧ | |
B£® | µ±ÈëÉä½Ç¦ÂÊʵ±Ôö´óʱ£¬¹âÏßc¡¢d¶¼¿ÉÄÜ»áÏûʧ | |
C£® | ¶ÔÓÚÈýÖÖ½éÖÊ£¬¹âÔÚ½éÖÊ¢òÖеĴ«²¥ËÙ¶È×îС | |
D£® | ³öÉä¹âÏßb¡¢c¡¢d²»Ò»¶¨Æ½ÐÐ |