ÌâÄ¿ÄÚÈÝ

¾«Ó¢¼Ò½ÌÍøÁ½¸ùÏà¾àL=0.5mµÄ×ã¹»³¤µÄ½ðÊôµ¼¹ìÈçͼ¼×Ëùʾ·ÅÖã¬ËûÃǸ÷ÓÐÒ»±ßÔÚͬһˮƽÃæÉÏ£¬ÁíÒ»±ß´¹Ö±ÓÚˮƽÃ森½ðÊôϸ¸Ëab¡¢cdµÄÖÊÁ¿¾ùΪm=50g£¬µç×è¾ùΪR=1.0¦¸£¬ËüÃÇÓëµ¼¹ì´¹Ö±½Ó´¥ÐγɱպϻØ·£¬¸ËÓëµ¼¹ìÖ®¼äµÄ¶¯Ä¦²ÁÒòÊý¦Ì=0.5£¬µ¼¹ìµç×è²»¼Æ£®Õû¸ö×°Öô¦ÓڴŸÐӦǿ¶È´óСB=1.0T¡¢·½ÏòÊúÖ±ÏòÉϵÄÔÈÇ¿´Å³¡ÖУ®µ±ab¸ËÔÚƽÐÐÓÚˮƽµ¼¹ìµÄÀ­Á¦F×÷ÓÃÏÂÑص¼¹ìÏòÓÒÔ˶¯Ê±£¬´Óijһʱ¿Ì¿ªÊ¼ÊÍ·Åcd¸Ë£¬²¢ÇÒ¿ªÊ¼¼Æʱ£¬cd¸ËÔ˶¯ËÙ¶ÈvcdËæʱ¼ä±ä»¯µÄͼÏóÈçͼÒÒËùʾ£¨ÔÚ0¡«1.0sºÍ2.0¡«3.0sÄÚ£¬cd×öÔȱäËÙÖ±ÏßÔ˶¯£©£®
£¨1£©ÇóÔÚ0¡«1.0sʱ¼äÄÚ£¬»Ø·ÖиÐÓ¦µçÁ÷µÄ´óС£»
£¨2£©ÇóÔÚ0¡«3.0sʱ¼äÄÚ£¬ab¸ËÔÚˮƽµ¼¹ìÉÏÔ˶¯µÄ×î´óËٶȣ»
£¨3£©ÒÑÖª1.0¡«2.0sÄÚ£¬ab¸Ë×öÔȼÓËÙÖ±ÏßÔ˶¯£¬ÔÚͼ±ûÖл­³öÔÚ0¡«3.0sÄÚ£¬À­Á¦FËæʱ¼ä±ä»¯µÄͼÏ󣮣¨²»ÐèҪд³ö¼ÆËã¹ý³Ì£¬Ö»Ðè»­³öͼÏߣ©
·ÖÎö£º£¨1£©ÓÉͼ¿´³ö£¬ÔÚ0¡«1.0sʱ¼äÄÚ£¬cd¸Ë×öÔȼÓËÙÖ±ÏßÔ˶¯£¬ËùÊܵݲÅàÁ¦ÊǺãÁ¦£¬¸ù¾ÝËÙ¶ÈͼÏóµÄбÂÊÇó³ö¼ÓËٶȣ¬ÓÉÅ£¶ÙµÚ¶þ¶¨ÂɺͰ²ÅàÁ¦¹«Ê½Çó½â»Ø·ÖиÐÓ¦µçÁ÷µÄ´óС£»
£¨2£©ÔÚ2s¡«3sʱ¼äÄÚ£¬cd¸Ë×öÔȼõËÙÖ±ÏßÔ˶¯£¬°²ÅàÁ¦×î´ó£®ÓÉͼÏóµÄбÂÊÇó³ö¼ÓËٶȣ¬¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉ¿ÉÇó³ö»Ø·ÖиÐÓ¦µçÁ÷µÄ´óС£»Óɱպϵç·ŷķ¶¨ÂÉ
£¨3£©·Ö¶ÎÓÉÅ£¶ÙµÚ¶þ¶¨ÂÉÇó³öÀ­Á¦£¬ÔÙ×÷³öͼÏó£®
½â´ð£º¾«Ó¢¼Ò½ÌÍø½â£º£¨1£©ÔÚ0-1sʱ¼äÄÚ£¬cd¸Ë×öÔȼÓËÙÔ˶¯£¬ÓÉͼ¿ÉÖª£º
  a1=
v1-v0
t
=
4-0
1
=4.0m/s2
¶Ôcd¸Ë½øÐÐÊÜÁ¦·ÖÎö£¬¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉÓУ¬
 ÔÚÊúÖ±·½ÏòÉÏ
  mg-f1=ma1
 ÔÚˮƽ·½ÏòÉÏ
  N1-F°²1=0  f1=¦ÌN1£¬F°²1=I1LB
´úÈëÊý¾Ý¿ÉµÃ£º
   I1=1.2A
£¨2£©ÔÚ2-3sʱ¼äÄÚ£¬a2=
v3-v2
t
=-4.0m/s2
 ÔÚÊúÖ±·½ÏòÉÏ
  mg-f2=-ma2
 ÔÚˮƽ·½ÏòÉÏ
  N2-F°²2=0 f2=¦ÌN2 £¬F°²2=I2LB
´úÈëÊý¾Ý¿ÉµÃ£ºI2=2.8A
ËùÒÔ  E2=2I2R=5.6A
ÓÖÒòΪ E2=BLvm
ËùÒÔ  vm=11.2m/s
£¨2£©ÔÚ0-1.0sÄÚ£¬F1=0.85N£¬v1=4.8m/s
  ÔÚ2.0-3.0sÄÚ£¬F2=1.65N£¬v2=11.2m/s
  ÔÚ1-2sÄÚ£¬ab¸Ë×ö¼ÓËÙ¶ÈΪ6.4m/s2µÄÔȼÓËÙÔ˶¯£¬¶Ôab¸Ë·ÖÎö¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉÓУº
  F-¦Ìmg-BIL=ma
ËùÒÔ F=1.17+0.8£¨t-1£©
¿ÉµÃ Fmin=1.17N£¬Fmax=1.97N
¹Ê»­³öÔÚ0¡«3.0sÄÚ£¬À­Á¦FËæʱ¼ä±ä»¯µÄͼÏóËùʾ£®
´ð£º
£¨1£©ÔÚ0¡«1.0sʱ¼äÄÚ£¬»Ø·ÖиÐÓ¦µçÁ÷µÄ´óСÊÇ1.2A£»
£¨2£©ÇóÔÚ0¡«3.0sʱ¼äÄÚ£¬ab¸ËÔÚˮƽµ¼¹ìÉÏÔ˶¯µÄ×î´óËÙ¶ÈÊÇ11.2m/s£»
£¨3£©»­³öÔÚ0¡«3.0sÄÚ£¬À­Á¦FËæʱ¼ä±ä»¯µÄͼÏóËùʾ£®
µãÆÀ£º±¾ÌâÉæ¼°µç´Å¸ÐÓ¦¹ý³ÌÖеĸ´ÔÓÊÜÁ¦·ÖÎö£¬½â¾öÕâÀàÎÊÌâµÄ¹Ø¼üÊÇ£¬¸ù¾Ý·¨À­µÚµç´Å¸ÐÓ¦¶¨ÂÉÇó½â¸ÐÓ¦µç¶¯ÊÆ£¬È»ºó¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉÇó½âÀ­Á¦µÄ´óС£¬½øÒ»²½¸ù¾ÝÔ˶¯×´Ì¬Áз½³ÌÇó½â£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿

Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com

¾«Ó¢¼Ò½ÌÍø