ÌâÄ¿ÄÚÈÝ
18£®º½Ìì·É»úÔÚÍê³É¶Ô¹þ²ª¿Õ¼äÍûÔ¶¾µµÄάÐÞÈÎÎñºó£¬ÔÚAµã´ÓÔ²ÐιìµÀI½øÈëÍÖÔ²¹ìµÀ¢ò£¬BΪ¹ìµÀ¢òÉϵÄÒ»µã£¬ÈçͼËùʾ£®¹ØÓÚº½Ìì·É»úµÄÔ˶¯£¬ÏÂÁÐ˵·¨ÖÐÕýÈ·µÄÊÇ£¨¡¡¡¡£©A£® | ÔÚ¹ìµÀ¢òÉϾ¹ýAµÄËÙ¶ÈСÓÚ¾¹ýBµÄËÙ¶È | |
B£® | ÔÚ¹ìµÀ¢òÉϾ¹ýAµÄ¶¯ÄÜ´óÓÚÔÚ¹ìµÀIÉϾ¹ýAµÄ¶¯ÄÜ | |
C£® | ÔÚ¹ìµÀ¢òÉÏÔ˶¯µÄÖÜÆÚСÓÚÔÚ¹ìµÀIÉÏÔ˶¯µÄÖÜÆÚ | |
D£® | ÔÚ¹ìµÀ¢òÉϾ¹ýAµÄ¼ÓËٶȴóÓÚÔÚ¹ìµÀIÉϾ¹ýAµÄ¼ÓËÙ¶È |
·ÖÎö º½Ìì·É»úÔÚͬһ¹ìµÀÉÏÔ˶¯Ê±»úеÄÜÊغ㣬¸ù¾Ý»úеÄÜÊغ㶨ÂÉ·ÖÎöÅжϺ½Ìì·É»úA¡¢BËٶȵĴóСÈçºÎ±ä»¯£»º½Ìì·É»úÈƵØÇò×öÔ²ÖÜÔ˶¯ÍòÓÐÒýÁ¦ÌṩÏòÐÄÁ¦£¬Ó¦ÓÃÍòÓÐÒýÁ¦¹«Ê½ÓëÅ£¶ÙµÚ¶þ¶¨ÂÉÇó³öÖÜÆÚÓë¼ÓËٶȣ¬È»ºó·ÖÎö´ðÌ⣮
½â´ð ½â£ºA¡¢º½Ìì·É»úÔÚ¢òÉÏÔ˶¯¹ý³ÌÖÐÖ»ÓÐÍòÓÐÒýÁ¦×ö¹¦£¬Æä»úеÄÜÊغ㣬ÎÀÐÇÓÉAµ½B¹ý³ÌÍòÓÐÒýÁ¦×öÕý¹¦£¬º½Ìì·É»úµÄ¶¯ÄÜÔö´ó£¬Ëٶȱä´ó£¬Òò´ËÔÚ¢òÉϾ¹ýAµÄËÙ¶ÈСÓÚ¾¹ýBµÄËٶȣ¬¹ÊAÕýÈ·£»
B¡¢º½Ìì·É»úÓɹìµÀ¢ñ±ä¹ìµ½¹ìµÀ¢ò£¬º½Ìì·É»úÒª×öÏòÐÄÔ˶¯£¬±ØÐëÔÚAµã¼õËÙ£¬Òò´ËÔÚ¹ìµÀ¢òÉϾ¹ýAµÄ¶¯ÄÜСÓÚÔÚ¹ìµÀ¢ñÉϾ¹ýA µÄ¶¯ÄÜ£¬¹ÊB´íÎó£»
C¡¢ÓÉÓÚ¹ìµÀ¢òµÄ°ë³¤ÖáСÓÚ¹ìµÀIµÄ°ë¾¶£¬ÓÉ¿ªÆÕÀÕµÚÈý¶¨ÂÉ$\frac{{a}^{3}}{{T}^{2}}$=kÖªÔÚ¹ìµÀ¢òÉÏÔ˶¯µÄÖÜÆÚСÓÚÔÚ¹ìµÀIÉÏÔ˶¯µÄÖÜÆÚ£¬¹ÊCÕýÈ·£»
D¡¢ÓÉÅ£¶ÙµÚ¶þ¶¨ÂɵãºG$\frac{Mm}{{r}^{2}}$=ma£¬¿ÉµÃ¼ÓËÙ¶ÈΪ£ºa=$\frac{GM}{{r}^{2}}$£¬ÔÚͬһµãrÏàͬ£¬aÏàͬ£¬ËùÒÔÔÚ¹ìµÀ¢òÉϾ¹ýAµÄ¼ÓËٶȵÈÓÚÔÚ¹ìµÀ¢ñÉϾ¹ýAµÄ¼ÓËٶȣ¬¹ÊD´íÎó£»
¹ÊÑ¡£ºAC£®
µãÆÀ ½â¾ö±¾ÌâµÄ¹Ø¼üÀí½â²¢ÕÆÎÕº½Ìì·É»úÈƵØÇòÔ˶¯µÄ¹æÂÉ£¬¸ù¾ÝÍòÓÐÒýÁ¦¶¨ÂɺÍÅ£¶ÙµÚ¶þ¶¨ÂÉÁÐʽ·ÖÎö¸÷Á¿µÄ´óС£®¶ÔÓÚÖÜÆÚ£¬Òª¸ù¾Ý¿ªÆÕÀÕµÚÈý¶¨ÂÉ·ÖÎö£®
A£® | ²¨µÄÖÜÆÚΪ0.15s | |
B£® | ²¨µÄ´«²¥ËÙ¶ÈΪ60m/s | |
C£® | ÔÚt=2sʱ£¬PµãËÙ¶È×î´ó£¬²¢ÑØyÖáÕý·½ÏòÔ˶¯ | |
D£® | ¾¹ý2s£¬Pµã¾¹ýµÄ·³ÌΪ12m | |
E£® | ÔÚt=4sʱ£¬Qµãµ½´ï²¨·åλÖà |
A£® | ÎïÌåµ½º£Æ½ÃæʱµÄÖØÁ¦ÊÆÄÜΪmgh | |
B£® | ´ÓÅ׳öµ½ÂäÖÁº£Æ½Ã棬ÖØÁ¦¶ÔÎïÌå×ö¹¦Îªmgh | |
C£® | ÎïÌåÔÚº£Æ½ÃæÉϵĶ¯ÄÜΪmgh+$\frac{1}{2}$mv${\;}_{0}^{2}$ | |
D£® | ÎïÌåÔÚº£Æ½ÃæÉϵÄÖØÁ¦ÊÆÄÜΪ-mgh |
A£® | СÇòÀ뿪°ëÇòÃæ֮ǰ£¬ËÙÂʱ仯ԽÀ´Ô½¿ì | |
B£® | СÇòÓë°ëÇòÃæ·ÖÀëʱ£¬Ð¡ÇòÀëµØÃæ¸ß¶ÈΪ$\frac{2}{3}$R | |
C£® | СÇòÂäµØʱËٶȴóСΪ$\sqrt{2gR}$ | |
D£® | СÇòÂäµØʱÖØÁ¦µÄ¹¦ÂÊΪmg$\sqrt{2gR}$ |