Question

ijµç¶¯¹Û¹â³µ¿Õ³µÖÊÁ¿Îª1180kg£¬ÂúÔØÈËÊý12ÈË£¬ÂúÔØʱÂÖÌ¥ÓëµØ×ܽӴ¥Ãæ»ýΪ4¡Á250cm²£¬×î´ó³µËÙΪ45km/h¡£Çë½â´ðÏÂÁÐÎÊÌ⣺£¨gÈ¡10N/kg£©?
£¨1£©Éè³ËԱƽ¾ùÖÊÁ¿Îª60 kg£¬ÇóÂúÔØʱ³µ¶Ôˮƽ·ÃæµÄѹǿ£¿
£¨2£©Çó¹Û¹â³µÔÚˮƽ·ÃæÉÏÒÔ×î´óËÙ¶ÈÔÈËÙÐÐÊ»18kmËùÓõÄʱ¼ä£¿?
£¨3£©Èô¹Û¹â³µÔÚˮƽ·ÃæÔÈËÙÐÐʻʱÊܵ½µÄ×èÁ¦Îª2¡Á10³ N£¬Çó¹Û¹â³µË®Æ½ÔÈËÙÐÐÊ»18k m¹ý³ÌÖУ¬Ç£ÒýÁ¦Ëù×öµÄ¹¦£¿

Answer 1

£¨1£©1.9¡Á10⁵Pa £¨2£©16min £¨3£©3.6¡Á10⁷J

½âÎöÊÔÌâ·ÖÎö£º£¨1£©F =" G" =£¨m_³µ£«m_ÈË£©g=£¨1180£«60¡Á12£©¡Á10= 1.9¡Á10⁴£¨N£© £¨1·Ö£©
P="F/" s=£¨1.9¡Á10⁴£©/£¨4¡Á250¡Á10^-4£©= 1.9¡Á10⁵£¨Pa£©    £¨1·Ö£©
£¨2£©t=" S" /v=18/45=0.4£¨h£©=16£¨min£©             £¨2·Ö£©
£¨3£©F_Ç£Òý = F_×è=2¡Á10³£¨N£©                 £¨1·Ö£©
W= F_Ç£Òý S =2¡Á10³¡Á18¡Á10³=3.6¡Á10⁷£¨J£©        £¨1·Ö£©
¿¼µã£ºÑ¹Ç¿µÄ´óС¼°Æä¼ÆË㣻Ëٶȹ«Ê½¼°ÆäÓ¦Ó㻹¦µÄ¼ÆË㣮
µãÆÀ£º±¾Ì⿼²éÁËѧÉú¶ÔËٶȹ«Ê½¡¢¶þÁ¦Æ½ºâÌõ¼þ¡¢¹¦µÄ¹«Ê½¡¢Ñ¹Ç¿¹«Ê½µÄÕÆÎÕºÍÔËÓã¬ÄÜ´Ó¼¼Êõ²ÎÊý±íÖеóöÏà¹ØÐÅÏ¢²¢ÀûÓúÃÊDZ¾ÌâµÄ¹Ø¼ü£®