2012Äê11Ô£¬ÎÒ¹ú½¢ÔØ»úÔÚº½Ä¸ÉÏÊ×½µ³É¹¦£®Éèijһ½¢ÔØ»úÖÊÁ¿m=2.5xl04kg£¬ËٶȦÔ0=80m/s£¬Èô½öÊÜ¿ÕÆø×èÁ¦ºÍ¼×°å×èÁ¦×÷Ó㬷ɻú½«ÔÚ¼×°åÉÏÒÔa0=0.8m/s2µÄ¼ÓËÙ¶È×öÔȼõËÙÔ˶¯£®×Ž¢¹ý³ÌÖк½Ä¸¾²Ö¹²»¶¯£®
£¨1£©·É»ú׎¢ºó£¬Èô½öÊÜ¿ÕÆø×èÁ¦ºÍ¼×°å×èÁ¦×÷Ó㬺½Ä¸¼×°åÖÁÉٶ೤²ÅÄܱ£Ö¤·É»ú²»»¬µ½º£À
£¨2£©ÎªÁËÈ÷ɻúÔÚÓÐÏÞ³¤¶ÈµÄÅܵÀÉÏÍ£ÏÂÀ´£¬¼×°åÉÏÉèÖÃÁËÀ¹×èË÷È÷ɻú¼õËÙ£¬Í¬Ê±¿¼Âǵ½·É»úβ¹³¹ÒË÷ʧ°ÜÐèÒª¸´·ÉµÄÇé¿ö£¬·É»ú׎¢Ê±²¢²»¹Ø±Õ·¢¶¯»ú£®Í¼Ê¾Îª·É»úβ²¿×°Öù³×¡×èÀ¹Ë÷ºóijһʱ¿ÌµÄÇé¾°£¬Èô·¢¶¯»úµÄÍÆÁ¦´óСF=1.2¡Á105N£¬·É»ú¸Õ¹³×¡×èµ²Ë÷ʱ£®ËÙ¶ÈÈÔΪ¦Ô0£¬ÒªÇó·É»úÔÚ¹³×¡×èÀ¹Ë÷ºóÔ˶¯x=60mÍ£ÏÂÀ´£¬Çó×èÀ¹Ë÷¶Ô·É»úËù×öµÄ¹¦£¿
·ÖÎö£º£¨1£©ÈôûÓÐÆäËû´ëÊ©£¬Ôò·É»úÖ»ÔÚ×èÁ¦×÷ÓÃÏÂ×ö¼õËÙÔ˶¯£¬ÔòÓÉÔ˶¯Ñ§¹«Ê½¿ÉÇóµÃ¼×°åµÄ³¤¶È£»
£¨2£©ÓÉÅ£¶ÙµÚ¶þ¶¨ÂÉ¿ÉÇóµÃ·É»úÊܵ½µÄ×èÁ¦£¬ÔÙÓɶ¯Äܶ¨Àí¿ÉÇóµÃ×èÀ¹Ë÷Ëù×öµÄ¹¦£®
½â´ð£º½â£º£¨1£©Òª±£Ö¤°²È«£¬ÔòӦʹ·É»ú׎¢ºóÄÜÍ£ÏÂÀ´£¬¹ÊδËÙ¶ÈΪÁ㣻ÔòÓÉÔ˶¯Ñ§¹«Ê½¿ÉµÃ£º
v02=2a0x0
½âµÃx0=4000m£»
£¨2£©ÔÚ·É»ú±»×èÀ¹Ë÷¹³×¡µ½Í£Ö¹¹ý³ÌÖУ¬Óɶ¯Äܶ¨Àí¿ÉµÃ£º
Fx-fx+W=0-
1
2
mv02
f=ma0
ÁªÁ¢ÇóµÃW=-8.6¡Á107J£»
´ð£º£¨1£©¼×°åÖÁÉÙÓ¦³¤4000m£»£¨2£©×èÀ¹Ë÷¶Ô·É»úËù×öµÄ¹¦Îª-8.6¡Á107J£®
µãÆÀ£ºÇ󹦵ķ½·¨ÓÐÈýÖÖ£º£¨1£©¹¦µÄ¹«Ê½£»£¨2£©¹¦Âʹ«Ê½£»£¨3£©¶¯Äܶ¨Àí£»¶ÔÓÚ±äÁ¦×ö¹¦Ò»¶¨Òª×¢Ò⶯Äܶ¨ÀíµÄÓ¦Óã®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

£¨2013?ºþÄÏÄ£Ä⣩2012Äê11Ô£¬ÎÒ¹ú½¢ÔØ»úÔÚº½Ä¸ÉÏÊ×½µ³É¹¦£®ÉèijһÔؽ¢»úÖÊÁ¿Îªm=2.5¡Á104 kg£¬ËÙ¶ÈΪv0=42m/s£¬Èô½öÊÜ¿ÕÆø×èÁ¦ºÍ¼×°å×èÁ¦×÷Ó㬷ɻú½«ÔÚ¼×°åÉÏÒÔa0=0.8m/s2µÄ¼ÓËÙ¶È×öÔȼõËÙÔ˶¯£¬×Ž¢¹ý³ÌÖк½Ä¸¾²Ö¹²»¶¯£®
£¨1£©·É»ú׎¢ºó£¬Èô½öÊÜ¿ÕÆø×èÁ¦ºÍ¼×°å×èÁ¦×÷Ó㬺½Ä¸¼×°åÖÁÉٶ೤²ÅÄܱ£Ö¤·É»ú²»»¬µ½º£À
£¨2£©ÎªÁËÈ÷ɻúÔÚÓÐÏÞ³¤¶ÈµÄÅܵÀÉÏÍ£ÏÂÀ´£¬¼×°åÉÏÉèÖÃÁË×èÀ¹Ë÷È÷ɻú¼õËÙ£¬Í¬Ê±¿¼Âǵ½·É»úβ¹³¹ÒË÷ʧ°ÜÐèÒª¸´·ÉµÄÇé¿ö£¬·É»ú׎¢Ê±²¢²»¹Ø±Õ·¢¶¯»ú£®Í¼Ê¾Îª·É»ú¹´×¡×èÀ¹Ë÷ºóijһʱ¿ÌµÄÇé¾°£¬´Ëʱ·¢¶¯»úµÄÍÆÁ¦´óСΪF=1.2¡Á105 N£¬¼õËٵļÓËÙ¶Èa1=20m/s2£¬´Ëʱ×èÀ¹Ë÷¼Ð½Ç¦È=106¡ã£¬¿ÕÆø×èÁ¦ºÍ¼×°å×èÁ¦±£³Ö²»±ä£¬Çó´Ëʱ×èÀ¹Ë÷³ÐÊܵÄÕÅÁ¦´óС£¿

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

£¨2013?ÓÀ¿µÊÐÄ£Ä⣩2012Äê11Ô£¬ÎÒ¹úJ-15½¢ÔØ»úÔÚº½Ä¸ÉÏÊ×½µ³É¹¦£®ÉèijһJ-15Ôؽ¢»úÖÊÁ¿Îªm=2.5¡Á104 kg£¬×Ž¢ËÙ¶ÈΪv0=42m/s£®¼ÙÈô·É»ú׎¢ºó£¬×öÔȼõËÙÔ˶¯£¬ËùÊÜ¿ÕÆøºÍ¼×°åµÄ×èÁ¦Ff=2.0¡Á104 N£¬¶øÇÒ׎¢¹ý³ÌÖк½Ä¸¾²Ö¹²»¶¯£®
£¨1£©·É»ú׎¢ºó£¬Èô½öÊÜ¿ÕÆø×èÁ¦ºÍ¼×°å×èÁ¦×÷Ó㬺½Ä¸¼×°åÖÁÉٶ೤²ÅÄܱ£Ö¤·É»ú²»»¬µ½º£À
£¨2£©ÎªÁËÈ÷ɻúÔÚÓÐÏÞ³¤¶ÈµÄÅܵÀÉÏÍ£ÏÂÀ´£¬¼×°åÉÏÉèÖÃÁË×èÀ¹Ë÷È÷ɻú¼õËÙ£¬Í¬Ê±¿¼Âǵ½·É»úβ¹³¹ÒË÷ʧ°ÜÐèÒª¸´·ÉµÄÇé¿ö£¬·É»ú׎¢Ê±²¢²»¹Ø±Õ·¢¶¯»ú£®Í¼Ê¾Îª·É»ú¹´×¡×èÀ¹Ë÷ºóijһʱ¿ÌµÄÇé¾°£¬´Ëʱ·¢¶¯»úµÄÍÆÁ¦´óСF=1.2¡Á105 N£¬×èÀ¹Ë÷³ÐÊܵÄÕÅÁ¦´óСFT=5.0¡Á105N£¬×èÀ¹Ë÷¼Ð½Ç¦È =106¡ã£¬¿ÕÆøºÍ¼×°å×èÁ¦±£³Ö²»±ä£¬ÊÔÇó´Ëʱ·É»úµÄ׎¢¼ÓËٶȣ¿£¨ÒÑÖªsin53¡ã=0.8£¬cos53¡ã=0.6£©

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

¾«Ó¢¼Ò½ÌÍø2012Äê11Ô£¬ÎÒ¹ú½¢ÔØ»úÔÚº½Ä¸ÉÏÊ×½µ³É¹¦£®Éèijһ½¢ÔØ»ú×ÜÖÊÁ¿Îªm=2.5¡Ál04 kg£¬ËÙ¶ÈΪvo=42m/s£¬Èô½öÊÜ¿ÕÆø×èÁ¦ºÍ¼×°å×èÁ¦×÷Ó㬷ɻú½«ÔÚ¼×°åÉÏÒÔao=0.8m/s2µÄ¼ÓËÙ¶È×öÔȼõËÙÔ˶¯£¬×Ž¢¹ý³ÌÖк½Ä¸¾²Ö¹²»¶¯£®
£¨1£©·É»ú׎¢ºó£¬Èô½öÊÜ¿ÕÆø×èÁ¦ºÍ¼×°å×èÁ¦×÷Ó㬺½Ä¸¼×°åÖÁÉٶ೤²ÅÄܱ£Ö¤·É»ú²»»¬µ½º£À
£¨2£©º½Ä¸·ÉÐмװåˮƽ£¬Ç°¶ËÉÏÇÌ£¬Ë®Æ½²¿·ÖÓëÉÏÇ̲¿·Öƽ»¬Á¬½Ó£¬Á¬½Ó´¦Dµã¿É¿´×÷Ô²»¡ÉϵÄÒ»µã£¬Ô²»¡°ë¾¶ÎªR=100m£®ÒÑÖª·É»úÆðÂä¼ÜÄܳÐÊܵÄ×î´ó×÷ÓÃÁ¦Îª·É»ú×ÔÖصÄ11±¶£¬Çó·É»ú°²È«Æð·É¾­¹ýDµãµÄ×î´óËٶȣ¿£¨gÈ¡10m/s2£©
£¨3£©ÎªÁËÈ÷ɻúÔÚÓÐÏÞ³¤¶ÈµÄÅܵÀÉÏÍ£ÏÂÀ´£¬¼×°åÉÏÉèÖÃÁË×èÀ¹Ë÷È÷ɻú¼õËÙ£¬Í¬Ê±¿¼Âǵ½·É»úβ¹³¹ÒË÷ʧ°ÜÐèÒª¸´·ÉµÄÇé¿ö£¬·É»ú׎¢Ê±²¢²»¹Ø±Õ·¢¶¯»ú£¬Í¼Ê¾Îª·É»ú¹´×¡×èÀ¹Ë÷ºóijһʱ¿ÌµÄÇé¾°£¬´Ëʱ·¢¶¯»úµÄÍÆÁ¦´óСΪF=1.2¡Á105N£¬¼õËٵļÓËÙ¶Èa1=20m/s2£¬´Ëʱ×èÀ¹Ë÷¼Ð½Ç¦È=106¡ã£¬¿ÕÆø×èÁ¦ºÍ¼×°å×èÁ¦±£³Ö²»±ä£¬Çó´Ëʱ×èÀ¹Ë÷³ÐÊܵÄÕÅÁ¦´óС£¿
£¨ÒÑÖªsin 53¡ã=0.8£¬cos 53¡ã=0.6£©

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º2013-2014ѧÄêÕã½­Ê¡Õã±±ÃûУÁªÃ˸ßÈýÉÏѧÆÚÆÚÖÐÁª¿¼ÎïÀíÊÔ¾í£¨½âÎö°æ£© ÌâÐÍ£º¼ÆËãÌâ

2012Äê11Ô£¬ÎÒ¹ú½¢ÔØ»úÔÚº½Ä¸ÉÏÊ×½µ³É¹¦¡£ÉèijһÔؽ¢»úÖÊÁ¿Îªm = 2.5¡Á104 kg£¬ËÙ¶ÈΪv0 = 42m/s£¬·É»ú½«ÔÚ¼×°åÉÏÒÔa0 =0.8m/s2µÄ¼ÓËÙ¶È×öÔȼõËÙÔ˶¯£¬×Ž¢¹ý³ÌÖк½Ä¸¾²Ö¹²»¶¯¡£

£¨1£©·É»ú׎¢ºó£¬Èô½öÊÜ¿ÕÆø×èÁ¦ºÍ¼×°å×èÁ¦×÷Ó㬺½Ä¸¼×°åÖÁÉٶ೤²ÅÄܱ£Ö¤·É»ú²»»¬µ½º£À

£¨2£©ÎªÁËÈ÷ɻúÔÚÓÐÏÞ³¤¶ÈµÄÅܵÀÉÏÍ£ÏÂÀ´£¬¼×°åÉÏÉèÖÃÁË×èÀ¹Ë÷È÷ɻú¼õËÙ£¬Í¬Ê±¿¼Âǵ½·É»úβ¹³¹ÒË÷ʧ°ÜÐèÒª¸´·ÉµÄÇé¿ö£¬·É»ú׎¢Ê±²¢²»¹Ø±Õ·¢¶¯»ú¡£Í¼Ê¾Îª·É»ú¹´×¡×èÀ¹Ë÷ºóijһʱ¿ÌµÄÇé¾°£¬´Ëʱ·¢¶¯»úµÄÍÆÁ¦´óСF = 1.2¡Á105 N£¬¼õËٵļÓËÙ¶Èa1 =20m/s2£¬´Ëʱ×èÀ¹Ë÷¼Ð½Ç¦È =1060£¬¿ÕÆø×èÁ¦ºÍ¼×°å×èÁ¦±£³Ö²»±ä£¬Çó´Ëʱ×èÀ¹Ë÷³ÐÊܵÄÕÅÁ¦´óС£¿£¨sin530=0.8,cos530=0.6£©

 

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸