Question

Ëæ×ÅÈËÃÇÉú»îˮƽµÄ²»¶ÏÌá¸ß£¬¸÷ÖÖСÆû³µÒѾ­×ß½øÎÒÃǵļÒÍ¥¡£×Ðϸ¹Û²ìºÍ˼¿¼£¬¿ÉÒÔ·¢ÏÖСÆû³µµÄһЩÉè¼ÆºÍʹÓùý³ÌÖеÄÐí¶àÏÖÏó¶¼ÓëÎïÀí֪ʶÓйأ¬ÇëÄãÓÃѧ¹ýµÄÎïÀí֪ʶ½â´ðÏÂÃæµÄÎÊÌ⣺¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡

¡¡¡¡ £¨1£©Ð¡Æû³µµÄÍâÐÎÉè¼Æ³ÉÁ÷ÏßÐÍ(Èçͼ6Ëùʾ)£¬µ±Ð¡Æû³µÔÚˮƽ·ÃæÉϸßËÙÐÐʻʱ¶Ô·ÃæµÄѹÁ¦±È¾²Ö¹Ê±¡¡¡¡¡¡¡¡¡¡ £¨Ñ¡Ìî¡°Ôö´ó¡±¡¢¡°¼õС¡±»ò¡°²»±ä¡±£©£¬ÆäÔ­ÒòÊÇ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡£¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡

£¨2£©Æû³µ·¢¶¯»ú¹¤×÷ʱ£¬¸×ÌåµÄζȺܸߣ¬ÎªÈ·±£·¢¶¯»úÕý³£¹¤×÷£¬Ðè¶Ô¸×Ìå½øÐÐÀäÈ´¡£Æû³µ·¢¶¯»ú³£ÓÃË®×÷ΪÀäÈ´¼Á£¬ÕâÖ÷ÒªÀûÓÃÁËË®µÄ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ µÄÌØÐÔ¡£ÈôÆû³µµÄË®ÏäÖÐ×°ÓÐ10kgË®£¬µ±Ë®ÎÂÉý¸ß50¡æʱÎüÊÕµÄÈÈÁ¿ÊÇ¡¡¡¡¡¡¡¡¡¡ J[ c_Ë®=4.2¡Á10³J/£¨kg¡¤^oC£©]¡£

£¨3£©Ä㻹·¢ÏÖСÆû³µµÄÄÄЩÉè¼ÆºÍʹÓùý³ÌÖеÄÄÄЩÏÖÏóÓëÎïÀí֪ʶÓйأ¿ÊÔ¾ÙÒ»Àý£¨ÒªÇóд³öÉè¼Æ»òÏÖÏó£¬ÒÔ¼°ËùÉæ¼°µÄÎïÀí֪ʶ£©¡£

ʾÀý£ºÉè¼Æ»òÏÖÏ󣺸ßËÙÐÐÊ»µÄÆû³µ¼±É²³µºó»¹Òª»¬ÐÐÒ»¶Î¾àÀë¡£

Éæ¼°µÄÎïÀí֪ʶ£ºÎïÌå¾ßÓйßÐÔ¡£

Éè¼Æ»òÏÖÏ󣺡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ ¡£

Éæ¼°µÄÎïÀí֪ʶ£º¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ ¡£

£¨4£©¡°Î塤һ¡±Æڼ䣬СÃ÷Ò»¼Ò¿ª³µÍâ³öÂÃÓΣ¬Í¾Öп´µ½Èçͼ7ËùʾµÄÏÞËÙÅÆ¡£Ð¡Ã÷ÓÃÁË10minµÄʱ¼äͨ¹ýÁËÕâ¶Î10km³¤µÄÏÞËÙ·¶Î£¬ÇëÄãͨ¹ý¼ÆËã˵Ã÷Ëû³¬ËÙÁËÂ𣿽üÆÚ£¬ÎÒ¹úÓÖ¼Ó´óÁ˶Գ¬Ëٺ;ƺó¼Ý³µµÄ²é´¦Á¦¶È¡£ÇëÄãдһ¾äÏà¹ØµÄ¾¯Ê¾ÓÒÔÌáÐÑ˾»úÅóÓÑÒ»¶¨Òª°´½»Í¨·¨¹æ¼Ý³µ¡£

£¨5£©Í¼8ΪijСÆû³µ²â¶¨ÓÍÏäÄÚÓÍÁ¿µÄµç·ԭÀíͼ¡£ÆäÖУº RxΪѹÁ¦´«¸ÐÆ÷£¬ËüµÄµç×èÖµËæÊܵ½Ñ¹Á¦µÄ±ä»¯¶ø±ä»¯£¬×èÖµËæѹÁ¦±ä»¯µÄ¹ØϵÈçͼ9Ëùʾ£»±íAΪÓÍÁ¿±í£¬ËüʵÖÊÊÇÒ»Ö»µçÁ÷±í£¬ÓÍÏäÄÚÓÍÁ¿µÄ±ä»¯Í¨¹ýµçÁ÷±íʾÊýµÄ±ä»¯ÏÔʾ³öÀ´£» R₀ÊÇ×èֵΪ5¦¸µÄ¶¨Öµµç×裻µçÔ´µçѹºãΪ15V£»ÓÍÏäλÓÚѹÁ¦´«¸ÐÆ÷RxÉÏ£¬¿ÕÓÍÏäÖØ50N¡£ÈôµçÁ÷±íµÄÁ¿³ÌΪ0_~ 0.6A£¬¸ÃÓÍÏä¼ÓÂúÓÍʱ£¬Ö¸ÕëÇ¡ºÃָʾ×î´ó¿Ì¶È£¬Ç󣺡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡

¢Ù´Ëʱ£¬ R₀Á½¶ËµÄµçѹÊǶàÉÙ£¿ RxµÄ×èÖµÊǶàÉÙ£¿¡¡¡¡¡¡¡¡¡¡¡¡¡¡

¢ÚÓÍÏä×î¶àÄÜ´¢ÓͶàÉÙÉý£¿£¨1Éý=1dm³£© £¨È¡g=10N/kg¡¢¦Ñ_ÆûÓÍ=0.7¡Á10³kg/m³£©¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡

£¨6£©Ð¡Æû³µ¸øÈËÃÇ´øÀ´Öî¶à·½±ã£¬µ«Ò²Ôì³ÉÁËһЩ¸ºÃæÓ°Ï죬ÈçÄÜÔ´ÏûºÄ¡¢Î²ÆøÎÛȾ¡¢ÔëÉùÎÛȾ¡¢½»Í¨×èÈûµÈ¡£ÇëÄã´Ó¿É³ÖÐø·¢Õ¹µÄ½Ç¶È£¬¾ÍÈçºÎ¼õСÆû³µµÄ¸ºÃæÓ°Ï죬Ìá³öÒ»ÌõºÏÀí»¯½¨Ò飺¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ ¡£

ͼ6

ͼ7

ͼ8

ͼ9

Answer 1

¢Å¼õС£¨1·Ö£© ÒòΪСÆû³µÍâÐÍÊÇÁ÷ÏßÐÍ£¬µ±Æû³µ¸ßËÙÐÐʻʱ£¬³µÉíÉÏ·½¿ÕÆøÁ÷ËÙ´ó£¬Ñ¹Ç¿Ð¡£¬Ð¡Æû³µÊܵ½ÁËÒ»¸öÏòÉϵÄÉýÁ¦£¬¼õСÁËСÆû³µ¶ÔµØÃæµÄѹÁ¦¡££¨1·Ö£©

¢Æ±ÈÈÈÈݱȽϴó£¨1·Ö£©2.1¡Á10⁶ £¨1·Ö£©     

¢Ç´ð£º²Î¿¼´ð°¸£º¢ÙСÆû³µµÄ˾»úºÍÇ°Åŵij˿ͱØÐëʹÓð²È«´ø   ÎïÌå¾ßÓйßÐÔ£»¢Ú°²È«´ø±È½Ï¿í    Ôö´óÊÜÁ¦Ãæ»ý£¬¼õСѹǿ£»¢ÛÆû³µÍ»È»Æð¶¯Ê±£¬ÈË»áºóÑö    ÎïÌå¾ßÓйßÐÔ µÈ¡£±¾Ð¡Ìâ¹²2·Ö£¬Ö»ÒªÁоٵÄÉè¼Æ»òÏÖÏó·ûºÏʵ¼Ê£¬Éæ¼°µÄÎïÀí֪ʶÕýÈ·¼´¿É¸÷¸ø1·Ö¡£

¢È½â£ºs = 10km      t = 10min = h

СÃ÷¿ª³µµÄËÙ¶ÈΪ£º

v = = =60km/h£¾40km/h  ¡à³¬ËÙ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­£¨1·Ö£©

¾¯Ê¾Ó²Î¿¼´ð°¸£ºÎªÁËÄãºÍËûÈ˵ݲȫ£¬Òû¾Æ²»¿ª³µ£¬¿ª³µ²»Òû¾Æ¡£¡­¡­£¨1·Ö£©

¢É¢Ù½â£ºR₀Á½¶ËµÄµçѹ£ºU₀=IR₀=0.6A¡Á5¦¸=3V¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­£¨1·Ö£©

                R_xÁ½¶ËµÄµçѹ£ºU_x=U- U₀=15V -3V=12V¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­£¨1·Ö£©

R_xµÄ×èÖµ£ºR_x=  =  =20¦¸¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­£¨1·Ö£©

¢Ú½â£ºÓÉͼÏñ¿ÉÖª£¬ R_x=20¦¸Ê±£¬Ñ¹Á¦´«¸ÐÆ÷Êܵ½µÄѹÁ¦F = 400N¡­£¨1·Ö£©

ÓÍÏäÄÚÓ͵ÄÖØÁ¦£ºG_ÓÍ=F-G_Ïä=400N-50N=350N¡­¡­¡­¡­¡­¡­¡­£¨1·Ö£©

ÓÍÏäÄÚÓ͵ÄÖÊÁ¿£º

¡ßG_ÓÍ=m_ÓÍg    ¡àm_ÓÍ =  =  = 35kg¡­¡­¡­¡­¡­£¨1·Ö£©

      ÓÍÏäÄÚ×î¶à´¢´æµÄÓÍ£º

¡ßm_ÓÍ=¦Ñ_ÆûÓÍV_ÓÍ ¡àV_ÓÍ= ==50¡Á10^-3m³=50L¡­£¨1·Ö£©

¢Ê ²Î¿¼´ð°¸£º¾¡Á¿Æï×ÔÐгµ¡¢²½ÐС¢³Ë¹«½»³µ³öÐУ»¾¡Á¿¹ºÂòСÅÅÁ¿Æû³µ

£¨´ð³öÒ»Ìõ¼´¿É£©¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­(1·Ö)                                                     

ÆÀ·Ö±ê×¼£º±¾Ìâ¹²£±6·Ö£¬¸÷СÌâÕ¼·Ö¼ûÏàӦСÀ¨ºÅÄڵķÖÖµ¡£ÆäÖТÈСÌâµÄ¾¯Ê¾ÓïºÍ¢ÊСÌâÌá³öµÄ½¨ÒéÖ»ÒªºÏÀí¼´¿É¡£