Question

13£®ÈçͼËùʾ£¬¾¢¶ÈϵÊýΪkµÄµ¯»É϶˹̶¨ÔÚµØÃæÉÏ£¬É϶ËÓëÒ»ÖÊÁ¿ÎªmµÄСÇòÏàÁ¬£¬´¦ÓÚ¾²Ö¹×´Ì¬£¬ÏÖÓÃÁ¦F½«Ð¡Çò»ºÂýÉÏÒÆ£¬Ö±µ½µ¯»É»Ö¸´Ô­³¤£®È»ºó³·µô¸ÃÁ¦£¬Ð¡Çò´Ó¾²Ö¹¿ªÊ¼ÏÂÂ䣬ÏÂÂä¹ý³ÌÖеÄ×î´óËÙ¶ÈΪv£¬²»¼Æ¿ÕÆø×èÁ¦£¬ÖØÁ¦¼ÓËÙ¶ÈΪg£®ÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©

• A£® СÇòµÄËÙ¶È×î´óʱ£¬µ¯»ÉµÄµ¯ÐÔÊÆÄÜΪÁã
• B£® ³·µôÁ¦Fºó£¬Ð¡Çò´Ó¾²Ö¹ÏÂÂäµ½×î´óËÙ¶ÈvµÄ¹ý³ÌÖУ¬¿Ë·þµ¯»Éµ¯Á¦×öµÄ¹¦Îª$\frac{{m}^{2}{g}^{2}}{k}$-$\frac{1}{2}$mv²
• C£® µ¯»ÉµÄµ¯ÐÔÊÆÄÜ×î´óʱ£¬Ð¡ÇòµÄ¼ÓËÙ¶ÈΪÁã
• D£® СÇò»ºÂýÉÏÒƹý³ÌÖУ¬Á¦F×ö¹¦Îª$\frac{{m}^{2}{g}^{2}}{k}$

Answer 1

·ÖÎö ·ÖÎöСÇòµÄÊÜÁ¦Çé¿ö£¬ÅжÏÆäÔ˶¯Çé¿ö£¬´Ó¶øÈ·¶¨ÆäËÙ¶È×î´óʱµ¯»ÉµÄ״̬£®ËÙ¶È×î´óʱ£¬Ð¡ÇòµÄºÏÁ¦ÎªÁ㣬Óɺú¿Ë¶¨ÂɺÍƽºâÌõ¼þÇó³ö´Ëʱµ¯»ÉѹËõÁ¿£¬ÔÙ¸ù¾Ý¶¯Äܶ¨Àí£¬¼´¿ÉÇó½â¿Ë·þµ¯»Éµ¯Á¦×öµÄ¹¦£»µ±ËÙ¶È×î´óʱ£¬µ¯»ÉµÄµ¯ÐÔÊÆÄܲ»ÎªÁ㣬¶øµ¯»ÉµÄµ¯ÐÔÊÆÄÜ×î´óʱ£¬ËÙ¶ÈΪÁ㣮

½â´ð ½â£ºA¡¢³·µô¸ÃÁ¦£¬Ð¡Çò´Ó¾²Ö¹¿ªÊ¼ÏÂÂäµÄ¹ý³ÌÖУ¬Êܵ½µ¯»ÉÏòÉϵĵ¯Á¦ºÍÖØÁ¦£¬µ¯Á¦ÏÈСÓÚÖØÁ¦£¬ÔÙµÈÓÚÖØÁ¦£¬ºó´óÓÚÖØÁ¦£¬ËùÒÔСÇòÏÈÏòϼÓËÙºó¼õËÙ£¬µ±µ¯Á¦µÈÓÚÖØÁ¦Ê±ËÙ¶È×î´ó£¬´Ëʱµ¯»É´¦ÓÚѹËõ״̬£¬µ¯ÐÔÊÆÄܲ»ÎªÁ㣮¹ÊA´íÎó£®
B¡¢Ð¡ÇòËÙ¶È×î´óʱ£¬ÓÐ mg=kx£¬µÃ x=$\frac{mg}{k}$£®
СÇò´Ó¾²Ö¹ÏÂÂäµ½×î´óËÙ¶ÈvµÄ¹ý³ÌÖУ¬¸ù¾Ý¶¯Äܶ¨Àí£¬ÔòÓУºmgx-W_¿Ë=$\frac{1}{2}$mv²£¬½âµÃ¿Ë·þµ¯»Éµ¯Á¦×öµÄ¹¦£ºW_¿Ë=$\frac{{m}^{2}{g}^{2}}{k}$-$\frac{1}{2}$mv²£¬¹ÊBÕýÈ·£»
C¡¢µ¯»ÉµÄµ¯ÐÔÊÆÄÜ×î´óʱ£¬Ð¡ÇòµÄËÙ¶ÈΪÁ㣬µ¯»ÉÐαäÁ¿×î´ó£¬µ¯Á¦´óÓÚÖØÁ¦£¬Ôò¼ÓËٶȲ»ÎªÁ㣬¹ÊC´íÎó£»
D¡¢Ð¡Çò´¦ÓÚƽºâλÖÃʱ£¬ÔòÓУºmg=kx£»Ð¡Çò»ºÂýÉÏÒƹý³ÌÖУ¬À­Á¦ÊDZäÁ¦£¬È¡Æ½¾ùÖµ£¬¸ù¾Ý×ö¹¦±í´ïʽ£¬ÔòÓУºÁ¦F×ö¹¦ W=$\frac{0+mg}{2}x$=$\frac{{m}^{2}{g}^{2}}{2k}$£¬¹ÊD´íÎó£»
¹ÊÑ¡£ºB

µãÆÀ ±¾ÌâµÄ»ù´¡ÊÇÕýÈ··ÖÎöСÇòµÄÔ˶¯Çé¿ö£¬ÕÆÎÕ±äÁ¦×ö¹¦µÄÇ󷨣º¶¯Äܶ¨Àí»òÁ¦µÄƽ¾ùÖµ³ËÒÔλÒÆ£®