ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿£¨14·Ö£©¡¢´«ËÍ´øºÍˮƽÃæµÄ¼Ð½ÇΪ37¡ã£¬ÍêÈ«ÏàͬµÄÁ½ÂÖºÍƤ´øµÄÇеãA¡¢B¼äµÄ¾àÀëΪ24m£¬ BµãÓҲࣨBµãÔÚ³¡µÄ±ßÔµ£©ÓÐÒ»ÉÏÏÂÎÞÏÞ¿í×óÓұ߾àΪdµÄÕý½»ÔÈÇ¿µç³¡ºÍÔÈÇ¿´Å³¡£¬µç³¡·½ÏòÊúÖ±ÏòÉÏ£¬ÔÈÇ¿´Å³¡´¹Ö±ÓÚÖ½ÃæÏòÀ´Å¸ÐӦǿ¶ÈB=103T.´«ËÍ´øÔÚµç»ú´ø¶¯Ï£¬ÒÔ4m/sËÙ¶È˳ʱÕëÔÈËÙÔËת£¬ÏÖ½«ÖÊÁ¿Îªm=0.1kg£¬µçÁ¿q=+10-2CµÄÎïÌå(¿ÉÊÓΪÖʵã)Çá·ÅÓÚ´«ËÍ´øµÄAµã£¬ÒÑÖªÎïÌåºÍ´«ËÍ´ø¼äµÄĦ²ÁϵÊýΪ¦Ì=0.8£¬ÎïÌåÔÚÔ˶¯¹ý³ÌÖеçÁ¿²»±ä£¬ÖØÁ¦¼ÓËÙ¶ÈÈ¡g=10m/s2£¬sin37¡ã=0.6£¬cos37¡ã=0.8.Çó£º
£¨1£©ÎïÌå´ÓAµã´«Ë͵½BµãµÄʱ¼ä£¿
£¨2£©ÈôÎïÌå´ÓBµã½øÈë»ìºÏ³¡ºó×öÔÈËÙÔ²ÖÜÔ˶¯£¬ÔòËù¼ÓµÄµç³¡Ç¿¶ÈµÄ´óСEӦΪ¶àÉÙ£¿ÎïÌåÈÔÈ»´Ó»ìºÏ³¡µÄ×ó±ß½ç³ö»ìºÏ³¡£¬Ôò³¡µÄÓұ߽ç¾àBµãµÄˮƽ¾àÀëdÖÁÉÙµÈÓÚ¶àÉÙ£¿
¡¾´ð°¸¡¿11s 0.016m
¡¾½âÎö¡¿
ÊÔÌâ·ÖÎö£ºÎïÌåÔÚбÃæÉÏ×ö¼ÓËÙÔ˶¯£¬ÓÉÅ£¶ÙµÚ¶þ¶¨ÂÉÓÐ
¦Ìmgcos370-mgsin37¡ã=ma
µÃa=¦Ìmgcos37¡ã-gsin37¡ã £¨1·Ö£©
a=0.4m/s2 £¨1·Ö£©
ÎïÌå×öÔȼÓËÙÔ˶¯µ½Óë´«ËÍ´øÓÐÏàͬËٶȣ¬ÓÐv=at1
t1=10s £¨1·Ö£©
ÎïÌåÔ˶¯Î»ÒÆΪx=at2 £¨1·Ö£©
µÃx=20m £¨1·Ö£©
ÎïÌå¼ÌÐøÓë´«ËÍ´øÒÔÏàͬËÙ¶ÈÔÈËÙÔ˶¯£¬ÓÐ
LAB-X=vt2 £¨1·Ö£©
ËùÒÔt2=1s £¨1·Ö£©
ÎïÌåÔÚ´«ËÍ´øÉÏÔ˶¯×Üʱ¼ät=t1+t2=11s £¨1·Ö£©
ÎïÌåÔÚ»ìºÏ³¡ÖÐ×öÔÈËÙÔ²ÖÜÔ˶¯£¬ÓÐgE=mg £¨1·Ö£©
µÃE=100N/C £¨1·Ö£©
qvB=m 1·Ö R==0.04m£¨1·Ö£©
ÎïÌåÀ뿪»ìºÏ³¡ÓÐsin370= £¨1·Ö£©
d=0.016m (1 ·Ö)