ÌâÄ¿ÄÚÈÝ
ÔĶÁ¶ÌÎÄ£¬»Ø´ðÎĺóµÄÎÊÌâ
·çº®Î¶È
ÈËÃǶ¼ÓÐÕâÑùµÄÌåÑ飺×ßÔÚ½ÖÉÏ£¬´©×ŵÄÒ·þ¸Ð¾õÀäů¸ÕºÃÊÊÒË£¬ÕâʱͻȻÆðÁËÒ»Õó´ó·ç£¬¶Ùʱ¸Ð¾õÖÜÉíº®À䣬Õâ¾ÍÊǷ纮ЧӦ£®·çº®Ð§Ó¦»áÓ°ÏìÈËÃǶÔÀäµÄ¸Ð¾õ£¬µ¼ÖÂÈËÌå¸Ð¾õµÄζÈÓëζȼƵÄʾÊýÓÐÃ÷ÏԵIJî±ð£®ÔÀ´£¬ÈËÌåµÄÖ÷ҪɢÈȲ¿Î»ÊÇƤ·ô£¬Í¨¹ýƤ·ôºìÍâ·øÉä¡¢½Ó´¥´«µ¼ÈÈÁ¿¡¢ÀäÈÈ¿ÕÆø¶ÔÁ÷ºÍº¹ÒºÕô·¢µÈ·½Ê½É¢ÈÈ£®µ±ÎÞ·çʱ£¬ÔÚÈËÌåƤ·ôºÍÖÜΧ¿ÕÆøÖ®¼ä£¬ÓÐÒ»¸ö±È½ÏÎȶ¨µÄ¿ÕÆø²ã£¬ÓÉÓÚ¿ÕÆøÊÇÈȵIJ»Á¼µ¼Ì壬¿ÉÒÔÆðµ½±£ÎÂ×÷Ó㻵±¹Î·çʱ£¬Îȶ¨µÄ¿ÕÆø±£Î²㲻¶Ï±»ÐÂÀ´µÄÀä¿ÕÆøËù´úÌ棬²¢°ÑÈÈÁ¿´ø×ߣ®·çËÙÔ½´ó£¬ÈËÌåɢʧµÄÈÈÁ¿Ô½¿ì¡¢Ô½¶à£¬ÈËÒ²¾Í¸Ð¾õÔ½º®À䣮¿Æѧ¼ÒÌá³öÓ÷纮ζÈÃèÊö¹Î·çʱÈËÌåƤ·ô¸Ð¾õµÄζȣ®²¢Í¨¹ý´óÁ¿ÊµÑéÕÒ³öÁ˷纮ζȺͷçËٵĹØϵ£¬Ï±íÊÇÔÚÆøÎÂΪ5¡æʱ£¬·çº®Î¶ȺͷçËٵĹØϵ£®
·çËÙ£¨km/h£© | 0 | 10 | 20 | 30 | 40 |
·çº®Î¶ȣ¨¡æ£© | 5 | 3 | 1 | -1 | -3 |
A£®·øÉä B£®´«µ¼ C£®¶ÔÁ÷ D£®º¹ÒºÕô·¢
£¨2£©Ò»¸öÖÊÁ¿Îª50kgµÄÈËɢʧÈÈÁ¿4.2¡Á105J£¬Èç¹ûÈËÌåûÓвúÉúÏàÓ¦µÄÈÈÁ¿£¬ÔòÌåν«Ï½µ______¡æ£®£ÛÈËÌåµÄ±ÈÈÈÈÝÈ¡4.2¡Á103 J/(kg¡¤¡æ)£Ý
£¨3£©ÀûÓñí¸ñ¸ø³öµÄÊý¾Ý×÷³ö·çº®Î¶ȡª·çËÙͼÏñ£®
£¨4£©µ±ÆøÎÂΪ5¡æ£¬·çËÙΪ35km/hʱ£¬µØÃæµÄË®»á½á±ùÂð£¿
´ð£º_______.
£¨5£©¸ù¾ÝËù¸øÊý¾Ý£¬ÓÃT±íʾ·çº®Î¶ȣ¬t±íʾÆøΣ¬v±íʾ·çËÙ£¬ÇëÄãд³öÈýÕß¹ØϵµÄ±í´ïʽ£º______________£®
£¨1£©C£¨2·Ö£©£»£¨2£©2£¨2·Ö£©£»£¨3£©ÈçͼËùʾ£¨2·Ö£©£»£¨4£©²»»á£¨2·Ö£©£»£¨5£©T=" ¨C" 0.2 v +t£¨2·Ö£©¡£
½âÎö