ÓÉ¡°æ϶ð±¼Ô¡±µ½¡°Íò»§·ÉÌ족£¬ÓÉ¡°¶«·½ºì¡±ÀÖÇúÏì³¹å¾Óîµ½º½ÌìÔ±ÑîÀûΰ¡¢·Ñ¿¡Áú¡¢Äôº£Ê¤åÛÓÎÌ«¿Õ£¬ÖлªÃñ×åµÄº½ÌìÃÎÏëÒѱä³ÉÏÖʵ.¡°ÉñÖÛ¡±ÁùºÅ·É´¬Éý¿Õºó£¬ÏÈÔËÐÐÔÚ½üµØµã¸ß¶È200 km¡¢Ô¶µØµã¸ß¶È350 kmµÄÍÖÔ²¹ìµÀÉÏ£¬ÊµÊ©±ä¹ìºó½øÈë343 kmµÄÔ²¹ìµÀ£¬Éè±ä¹ìºó×öÔÈËÙÔ²ÖÜÔ˶¯£¬¹²ÔËÐÐnÖÜ£¬Æðʼʱ¿ÌΪt1,½áÊøʱ¿ÌΪt2,ÔËÐÐËÙ¶ÈΪv£¬°ë¾¶Îªr.Ôò¼ÆËãÆäÔËÐÐÖÜÆÚ¿ÉÓ㨠   £©

A.    B.   C.    D.

AC


½âÎö:

ÓÉÌâÒâÖª£ºT===,ÏÔÈ»ACÕýÈ·.

Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

Èçͼ7-4-2Ëùʾ£¬ÓÉ¡°æ϶ð±¼Ô¡±µ½¡°Íò»§·ÉÌ족£¬ÓÉ¡°¶«·½ºì¡±ÀÖÇúÏì³¹å¾Óîµ½º½ÌìÔ±ÑîÀûΰåÛÓÎÌ«¿Õ£¬ÖлªÃñ×åÔØÈ˺½ÌìÃÎÏëÒѱä³ÉÏÖʵ.

ͼ7-4-2

£¨1£©¼ÙÉè¡°ÉñÖÛ¡±ÎåºÅʵʩ±ä¹ìºó×öÔÈËÙÔ²ÖÜÔ˶¯£¬¹²ÔËÐÐÁËnȦ£¬Æðʼʱ¿ÌΪt1£¬½áÊøʱ¿ÌΪt2£¬Ô˶¯ËÙ¶ÈΪv£¬°ë¾¶Îªr£¬Ôò¼ÆËãÆäÔ˶¯ÖÜÆÚΪ£¨    £©

¢ÙT=  ¢ÚT=  ¢ÛT=¢ÜT=

A.¢Ù¢Û                B.¢Ù¢Ü                 C.¢Ú¢Û                 D.¢Ú¢Ü

£¨2£©¡°ÉñÖÛ¡±ÎåºÅµÄ·ÉÐпɿ´³É½üµØÔ˶¯£¬ÑîÀûΰµÄÖÊÁ¿Îª65 kg£¬ËûÔÚÔ˶¯¹ý³ÌÖеÄÏòÐÄÁ¦¿É¹ÀËãΪ_________¡Á102 N.

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

ÓÉ¡°æ϶ð±¼Ô¡±µ½¡°Íò»§·ÉÌ족£¬ÓÉ¡°¶«·½ºì¡±ÀÖÇúÏì³¹å¾Óîµ½º½ÌìÔ±ÑîÀûΰåÛÓÎÌ«¿Õ£¬ÖлªÃñ×åÔØÈ˺½ÌìµÄÃÎÏëÒѱä³ÉÏÖʵ£®¡°ÉñÖÛ¡±ÎåºÅ·É´¬Éý¿Õºó£¬ÏÈÔËÐÐÔÚ½üµØµã¸ß¶È200 km¡¢Ô¶µØµã¸ß¶È350 kmµÄÍÖÔ²¹ìµÀÉÏ£¬ÊµÊ©±ä¹ìºó£¬½øÈë343 kmµÄ¹ìµÀ£®¼ÙÉè¡°ÉñÖÛ¡±ÎåºÅʵʩ±ä¹ìºó×öÔÈËÙÔ²ÖÜÔ˶¯£¬¹²ÔËÐÐÁËnÖÜ£¬Æðʼʱ¿ÌΪt1£¬½áÊøʱ¿ÌΪt2£¬ÔËÐÐËÙ¶ÈΪv£¬°ë¾¶Îªr£¬Ôò¼ÆËãÆäÔËÐÐÖÜÆÚ¿ÉÓ㨠   £©

¢ÙT=(t2-t1)/n  ¢ÚT=(t1-t2)/n  ¢ÛT=2¦Ðr/v  ¢ÜT=2¦Ðv/r

A.¢Ù¢Û         B.¢Ù¢Ü             C.¢Ú¢Û              D.¢Ú¢Ü

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

ÓÉ¡°æ϶ð±¼Ô¡±µ½¡°Íò»§·ÉÌ족£¬ÓÉ¡°¶«·½ºì¡±ÀÖÇúÏì³¹å¾Óîµ½º½ÌìÔ±ÑîÀûΰ¡¢·Ñ¿¡Áú¡¢Äôº£Ê¤åÛÓÎÌ«¿Õ£¬ÖлªÃñ×åµÄº½ÌìÃÎÏëÒѱä³ÉÏÖʵ.¡°ÉñÖÛ¡±ÁùºÅ·É´¬Éý¿Õºó£¬ÏÈÔËÐÐÔÚ½üµØµã¸ß¶È200 km¡¢Ô¶µØµã¸ß¶È350 kmµÄÍÖÔ²¹ìµÀÉÏ£¬ÊµÊ©±ä¹ìºó½øÈë343 kmµÄÔ²¹ìµÀ£¬Éè±ä¹ìºó×öÔÈËÙÔ²ÖÜÔ˶¯£¬¹²ÔËÐÐnÖÜ£¬Æðʼʱ¿ÌΪt1,½áÊøʱ¿ÌΪt2,ÔËÐÐËÙ¶ÈΪv£¬°ë¾¶Îªr.Ôò¼ÆËãÆäÔËÐÐÖÜÆÚ¿ÉÓ㨠   £©

A.                                B.

C.                                   D.

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸