Question

5£®Ä³Í¬Ñ§ÀûÓõç´Å´òµã¼ÆʱÆ÷´ò³öµÄÖ½´øÀ´ÑéÖ¤»úеÄÜÊغ㶨ÂÉ£¬¸ÃͬѧÔÚʵÑéÖеõ½Ò»ÌõÖ½´ø£¬ÈçͼËùʾ£¬ÔÚÖ½´øÉÏÈ¡6¸ö¼ÆÊýµã£¬Á½¸öÏàÁÚ¼ÆÊýµã¼äµÄʱ¼ä¼ä¸ôΪT=0.02s£®ÆäÖÐ1¡¢2¡¢3µãÏàÁÚ£¬4¡¢5¡¢6µãÏàÁÚ£¬ÔÚ3µãºÍ4µãÖ®¼ä»¹ÓÐÈô¸É¸öµã£®
s₁ÊÇ1¡¢3Á½µãµÄ¾àÀ룬s₂ÊÇ2¡¢5Á½µãµÄ¾àÀ룬s₃ÊÇ4¡¢6Á½µãµÄ¾àÀ룮
£¨1£©ÊµÑé¹ý³ÌÖУ¬ÏÂÁвÙ×÷ÕýÈ·µÄÊÇCD£®
A£®µç´Å´òµã¼ÆʱÆ÷Ó¦½ÓÔÚ220V½»Á÷µçÔ´ÉÏ
B£®ÊµÑéʱӦÏÈËÉ¿ªÖ½´ø£¬È»ºóѸËÙ´ò¿ª´òµã¼ÆʱÆ÷
C£®ÊµÑéʱӦÏÈ´ò¿ª´òµã¼ÆʱÆ÷£¬È»ºóËÉ¿ªÖ½´ø
D£®Ö½´øÓ¦Àí˳£¬´©¹ýÏÞλ¿×²¢±£³ÖÊúÖ±
£¨2£©µã2Ëٶȵıí´ïʽv₂=$\frac{{s}_{1}}{2T}$£® 
£¨3£©¸Ãͬѧ²âµÃµÄÊý¾ÝÊÇs₁=4.00cm£¬s₂=16.00cm£¬s₃=8.00cm£¬ÖØÎÖÊÁ¿Îªm£©ÔÚÊúÖ±·½ÏòÉÏÔ˶¯´Óµã2Ô˶¯µ½µã5¹ý³ÌÖУ¬¶¯ÄÜÔö¼ÓÁ¿Îª1.50m£¬ÊÆÄܼõÉÙÁ¿Îª1.57m£®£¨½á¹û±£ÁôÈýλÓÐЧÊý×Ö£¬ÖØÁ¦¼ÓËÙ¶Èg=9.8m/s²£©

Answer 1

·ÖÎö £¨1£©µç´Å´òµã¼ÆʱÆ÷Ó¦½ÓÔÚ4-6VµÄ½»Á÷µçÔ´ÉÏ£¬ÊµÑéʱӦÏȽÓͨµçÔ´£¬ÔÙÊÍ·ÅÖ½´ø£®
£¨2£©¸ù¾Ýij¶Îʱ¼äÄÚµÄƽ¾ùËٶȵÈÓÚÖмäʱ¿ÌµÄ˲ʱËÙ¶ÈÇó³öµã2µÄ˲ʱËٶȣ®
£¨3£©¸ù¾Ýƽ¾ùËٶȵÄÍÆÂÛ·Ö±ðÇó³öµã2¡¢µã5µÄ˲ʱËٶȣ¬´Ó¶øÇó³ö¶¯ÄܵÄÔö¼ÓÁ¿£¬¸ù¾ÝϽµµÄ¸ß¶ÈÇó³öÖØÁ¦ÊÆÄܵļõСÁ¿£®

½â´ð ½â£º£¨1£©A¡¢µç´Å´òµã¼ÆʱÆ÷½â4-6VµÄ½»Á÷µçÔ´£®¹ÊA´íÎó£®
B¡¢ÊµÑéʱӦÏȽÓͨµçÔ´£¬ÔÙËÉ¿ªÖ½´ø£®¹ÊB´íÎó£¬CÕýÈ·£®
D¡¢ÎªÁ˼õС×èÁ¦£¬Ö½´øÓ¦Àí˳£¬´©¹ýÏÞλ¿×²¢±£³ÖÊúÖ±£®¹ÊDÕýÈ·£®
¹ÊÑ¡CD£®
£¨2£©Ä³¶Îʱ¼äÄÚµÄƽ¾ùËٶȵÈÓÚÖмäʱ¿ÌµÄ˲ʱËٶȣ¬Ôò${v}_{2}=\frac{{s}_{1}}{2T}$£®
£¨3£©µã2µÄ˲ʱËÙ¶È${v}_{2}=\frac{{s}_{1}}{2T}$=$\frac{0.04}{0.04}m/s=1m/s$£¬µã5µÄ˲ʱËÙ¶È${v}_{5}=\frac{{s}_{3}}{2T}$=$\frac{0.08}{0.04}=2m/s$£¬
Ôò¶¯ÄܵÄÔö¼ÓÁ¿$¡÷{E}_{k}=\frac{1}{2}m{{v}_{5}}^{2}-\frac{1}{2}m{{v}_{2}}^{2}=\frac{1}{2}¡Ám¡Á3=1.50mJ$£®
ÖØÁ¦ÊÆÄܵļõСÁ¿¡÷E_p=mgs₂=m¡Á9.8¡Á0.16J=1.57mJ£®
¹Ê´ð°¸Îª£º£¨1£©CD£»£¨2£©$\frac{{s}_{1}}{2T}$£»£¨3£©1.50£»1.57£®

µãÆÀ ½â¾ö±¾ÌâµÄ¹Ø¼üÕÆÎÕʵÑéµÄÔ­Àí£¬ÒÔ¼°ÊµÑé×¢ÒâµÄÊÂÏ֪µÀÎó²îÐγɵÄÔ­Òò£®