ÌâÄ¿ÄÚÈÝ

2£®ÈçͼËùʾ£¬ËÄ·ÖÖ®Ò»¹â»¬µÄÊúÖ±¾øÔµÔ²¹ìµÀABÓëˮƽ¾øÔµ¹ìµÀBC¹Ì¶¨ÔÚͬһÊúÖ±ÃæÄÚ£®Ô²¹ìµÀ°ë¾¶ÎªR£¬Ô²ÐÄOµãºÍBµãËùÔÚÊúÖ±ÏßµÄÓÒ²à¿Õ¼ä´æÔÚ×ÅÆ½ÐÐÓÚ¹ìµÀBCÏòÓÒµÄÔÈÇ¿µç³¡£¬ÏÖÓÐÒ»ÖÊÁ¿Îªm¡¢µçºÉÁ¿Îª-qµÄСÎï¿é£¬´Óˮƽ¹ìµÀÉϵ½Bµã¾àÀëΪ2RµÄPµãÓɾ²Ö¹ÊÍ·Å£¬Îï¿éµÚÒ»´Î³å³öÔ²ÐιìµÀÄ©¶ËAºó»¹ÄÜÉÏÉýµÄ¸ß¶ÈΪ$\frac{R}{2}$£®ÒÑÖªÎï¿éÓëˮƽ¹ìµÀ¼äµÄ¶¯Ä¦²ÁÒòÊýΪ¦Ì£¬²»¼Æ¿ÕÆø×èÁ¦£¬ÖØÁ¦¼ÓËÙ¶ÈΪg£¬Çó£º
£¨1£©Îï¿éµÚÒ»´Î¾­¹ýBµãʱµÄËÙ¶ÈvB£»
£¨2£©ÔÈÇ¿µç³¡µÄ³¡Ç¿E£»
£¨3£©Îï¿éµÚ¶þ´Î¾­¹ýBµãºóÏòÓÒÔ˶¯µÄ×î´ó¾àÀëx£®

·ÖÎö £¨1£©¸ù¾Ý»úеÄÜÊØºã¶¨ÂÉÇóÎï¿éµÚÒ»´Î¾­¹ýBµãʱµÄËÙ¶È£»
£¨2£©´ÓPµ½B¸ù¾Ý¶¯Äܶ¨ÀíÇó½âµç³¡Ç¿¶ÈE£»
£¨3£©´ÓBÏòÓÒµ½ËٶȼõΪ0¸ù¾Ý¶¯Äܶ¨ÀíÁÐʽÇóÎï¿éµÚ¶þ´Î¾­¹ýBµãºóÏòÓÒÔ˶¯µÄ×î´ó¾àÀ룻

½â´ð ½â£º£¨1£©ÓÉ»úеÄÜÊØºã¶¨ÂÉÓÐ$\frac{1}{2}m{v}_{B}^{2}=mg£¨R+\frac{R}{2}£©$
½âµÃ${v}_{B}^{\;}=\sqrt{3gR}$
£¨2£©´ÓPµ½B£¬Óɶ¯Äܶ¨ÀíÓÐ$2R£¨qE-¦Ìmg£©=\frac{1}{2}m{v}_{B}^{2}$
½âµÃ£º$E=\frac{mg£¨3+4¦Ì£©}{4q}$
£¨3£©Óɶ¯Äܶ¨ÀíÓÐ$-£¨qE+¦Ìmg£©s=0-\frac{1}{2}m{v}_{B}^{2}$
½âµÃ£º$s=\frac{6R}{3+8¦Ì}$
´ð£º£¨1£©Îï¿éµÚÒ»´Î¾­¹ýBµãʱµÄËÙ¶È${v}_{B}^{\;}$Ϊ$\sqrt{3gR}$£»
£¨2£©ÔÈÇ¿µç³¡µÄ³¡Ç¿EΪ$\frac{mg£¨3+4¦Ì£©}{4q}$£»
£¨3£©Îï¿éµÚ¶þ´Î¾­¹ýBµãºóÏòÓÒÔ˶¯µÄ×î´ó¾àÀëxΪ$\frac{6R}{3+8¦Ì}$

µãÆÀ ±¾ÌâÊÇÅ£¶ÙµÚ¶þ¶¨ÂɺͶ¯Äܶ¨ÀíÏà½áºÏµÄÎÊÌ⣬½âÌâʱעÒ⣺µç³¡Á¦¡¢ÖØÁ¦×ö¹¦Óë·¾¶Î޹أ¬¶øÄ¦²ÁÁ¦×ö¹¦Óë·¾¶Óйأ»¶¯Äܶ¨Àí¿ÉÒÔÈ«¹ý³ÌʹÓã¬Ò²¿ÉÒÔ·Ö¹ý³ÌÇó½â£¬×¢ÒâÅжϹ¦µÄÕý¸º£®

Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿

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

¾«Ó¢¼Ò½ÌÍø