ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿ÈçͼËùʾ£¬¶¤×ÓA¡¢BÏà¾à5l£¬´¦ÓÚͬһ¸ß¶È£®Ï¸ÏßµÄÒ»¶ËϵÓÐÖÊÁ¿ÎªMµÄСÎï¿é£¬ÁíÒ»¶ËÈƹýA¹Ì¶¨ÓÚB£®ÖÊÁ¿ÎªmµÄСÇò¹Ì¶¨ÔÚϸÏßÉÏCµã£¬B¡¢C¼äµÄÏß³¤Îª3l£®ÓÃÊÖÊúÖ±ÏòÏÂÀסСÇò£¬Ê¹Ð¡ÇòºÍÎï¿é¶¼¾²Ö¹£¬´ËʱBCÓëˮƽ·½ÏòµÄ¼Ð½ÇΪ53¡ã£®ËÉÊÖºó£¬Ð¡ÇòÔ˶¯µ½ÓëA¡¢BÏàͬ¸ß¶ÈʱµÄËÙ¶ÈÇ¡ºÃΪÁ㣬ȻºóÏòÏÂÔ˶¯£®ºöÂÔÒ»ÇÐĦ²Á£¬ÖØÁ¦¼ÓËÙ¶ÈΪg£¬È¡sin53¡ã=0.8£¬cos53¡ã=0.6£®Çó£º
£¨1£©Ð¡ÇòÊܵ½ÊÖµÄÀÁ¦´óСF£»
£¨2£©Îï¿éºÍСÇòµÄÖÊÁ¿Ö®±ÈM:m£»
£¨3£©Ð¡ÇòÏòÏÂÔ˶¯µ½×îµÍµãʱ£¬Îï¿éMËùÊܵÄÀÁ¦´óСT£®
¡¾´ð°¸¡¿£¨1£© £¨2£© £¨3£©£¨£©
¡¾½âÎö¡¿£¨1£©ÉèСÇòÊÜAC¡¢BCµÄÀÁ¦·Ö±ðΪF1¡¢F2
F1sin53¡ã=F2cos53¡ã F+mg=F1cos53¡ã+ F2sin53¡ãÇÒF1=Mg
½âµÃ
£¨2£©Ð¡ÇòÔ˶¯µ½ÓëA¡¢BÏàͬ¸ß¶È¹ý³ÌÖÐ
СÇòÉÏÉý¸ß¶Èh1=3lsin53¡ã£¬Îï¿éϽµ¸ß¶Èh2=2l
»úеÄÜÊغ㶨ÂÉmgh1=Mgh2
½âµÃ
£¨3£©¸ù¾Ý»úеÄÜÊغ㶨ÂÉ£¬Ð¡Çò»Øµ½Æðʼµã£®Éè´ËʱAC·½ÏòµÄ¼ÓËٶȴóСΪa£¬ÖØÎïÊܵ½µÄÀÁ¦ÎªT
Å£¶ÙÔ˶¯¶¨ÂÉMg¨CT=Ma СÇòÊÜACµÄÀÁ¦T¡ä=T
Å£¶ÙÔ˶¯¶¨ÂÉT¡ä¨Cmgcos53¡ã=ma
½âµÃ£¨£©
¡¾ÌâÄ¿¡¿Ä³Í¬Ñ§Óõç´Å´òµã¼ÆʱÆ÷Ñо¿ÊÖÀÖ½´øµÄÔ˶¯Çé¿ö£¬µÃµ½µÄÖ½´øÈçͼËùʾ£¬ËûÔÚÖ½´øÉÏÕÒ³öÁ¬ÐøµÄ6¸öµã£¬·Ö±ð±ê¼ÇÉÏA¡¢B¡¢C¡¢D¡¢E¡¢F£¬²¢ÓÃÖ±³ßÁ¿³öÁ½¸öÏàÁÚµã¼äµÄ¾àÀëx1¡¢x2¡¢x3¡¢x4¡¢x5£¬Êý¾Ý¼ûÏÂ±í£® (µç´Å´òµã¼ÆʱÆ÷ʹÓÃ50 HzµÍѹ½»Á÷µçÔ´)
x1/cm | x2/cm | x3/cm | x4/cm | x5/cm |
3.75 | 4.50 | 5.12 | 4.65 | 4.12 |
(1)¸ù¾ÝÕâЩÊý¾Ý£¬ÔËÓÃÄãѧ¹ýµÄ֪ʶ£¬Çó³öÖ½´øÔÚA¡¢E¶ÎÔ˶¯Ê±µÄƽ¾ùËٶȣ®
(2)Çó³ö´òBµãʱֽ´øÔ˶¯µÄ˲ʱËٶȵÄ×îºÏÀíÖµ£®