Question

£¨2013ºÓ±±Ê¡ÌÆɽÊÐÆÚÄ©Ä£Ä⣩ÃÀ¹ú¡°¿ÏÄáµÏ¡±ºÅº½¿Õĸ½¢½¢Ì峤318.5m£¬½¢ÉÏÓаïÖú·É»úÆð·ÉµÄµ¯Éäϵͳ¡£·ÉÐмװåÉÏÓÃÓÚ·É»úÆð·ÉµÄÅܵÀ³¤200m£¬½¢ÉÏ´îÔصÄÕ½»úΪ¡°F/A-18¡±ÐÍ£¨´ÂºÅ´ó»Æ·ä£©Õ½»ú¡£ÒÑÖª¸ÃÐͺÅÕ½»úµÄ×ÜÖÊÁ¿Îª16¶Ö£¬×îСÆð·ÉËÙ¶ÈΪ50m/s¡£¸ÃÕ½»úÆð·ÉʱÔÚÅܵÀÉÏ»¬Ðйý³ÌÖÐËùÊÜ×èÁ¦ÎªÆäÖØÁ¦µÄ0.1±¶£¬·¢¶¯»ú²úÉúµÄÍÆÁ¦Îª8¡Ál0⁴N¡££¨ÖØÁ¦¼ÓËÙ¶Èg=10m/s²£©

Çó£º

   £¨1£©¸ÃÕ½»úÆð·ÉʱÔÚÅܵÀÉÏ»¬Ðйý³ÌÖеļÓËٶȣ»

   £¨2£©Îª±£Ö¤Õ½»úÕý³£Æð·É£¬µ¯Éäϵͳ¶Ô·É»úÖÁÉÙ×ö¶àÉÙ¹¦£º

   £¨3£©Èôµ¯ÉäϵͳÒѾ­Ë𻵣¬¿É²ÉÓÃʲô·½·¨Ê¹·É»úÔÚº½¿Õĸ½¢ÉÏÆð·É¡£

Answer 1

½â£º£¨1£©¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨Âɵãº

¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­£® ¢Å

ÀûÓÃÌâÄ¿ÖÐÒÑÖªÌõ¼þ£¬²¢½«F_f=0£®1mg´úÈë¿É½âµÃ£º

a=4m/s²  ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­£® ¡­¡­¡­£®¢Æ

£¨2£©Éè·É»ú±»µ¯Éäϵͳµ¯³öʱËÙ¶ÈΪv₀£¬µ¯Éäϵͳ¶ÔÆä×ö¹¦ÎªW£¬Ôò£º

 ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­£® ¡­¢Ç

 À뿪µ¯Éäϵͳºó×öÔȼÓËÙÔ˶¯¡£À뿪µØÃæʱµÄËÙ¶ÈΪv_t£¬Ôò£º

 ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­£® ¢È

 ´úÈëÊýÖµºó½âµÃ£ºW=7£®2¡Á10⁶J¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­£®¢É

£¨3£©ÈôûÓе¯Éäϵͳ£¬Ôò·É»ú×ö³õËÙ¶ÈΪÁãµÄÔȼÓËÙÔ˶¯£¬ÉèÀ뿪·ÉÐмװåʱËÙ¶ÈΪv£¬

Ôò£º

´úÈëÊýÖµ¼ÆËãµÃ£ºv=40m/s¡£ÕâÑù£¬Ö»ÒªÈú½Ä¸ÑØ×Å·É»úÆð·ÉµÄ·½Ïò£¬ÒÔ²»Ð¡ÓÚ10m/sµÄËÙ¶ÈÇ°½ø£¬¾ÍÄܱ£Ö¤·É»úÕý³£Æð·É¡£

Ö»ÒªÄÜ´ð³ö¡°º½¿Õĸ½¢ÑØ×Å·É»úÆð·É·½ÏòÒÔÊʵ±µÄËÙ¶ÈÔ˶¯¡±¼´¿ÉµÃ·Ö¡£

£¨Ã¿Ê½2·Ö£¬£¨3£©Ð¡Ìâ3·Ö£¬ÆäËü·½·¨ÕýȷͬÑùµÃ·Ö£©