ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾÊÇijͬѧÔÚ×öÔȱäËÙÖ±ÏßÔ˶¯ÊµÑéÖлñµÃµÄÒ»ÌõÖ½´ø£®
£¨1£©ÒÑÖª´òµã¼ÆʱÆ÷µçԴƵÂÊΪ50Hz£¬ÔòÖ½´øÉÏ´òÏàÁÚÁ½µãµÄʱ¼ä¼ä¸ôΪ
£¨2£©A¡¢B¡¢C¡¢DÊÇÖ½´øÉÏËĸö¼ÆÊýµã£¬Ã¿Á½¸öÏàÁÚ¼ÆÊýµã¼äÓÐËĸöµãûÓл³ö£¬´ÓͼÖжÁ³öA¡¢BÁ½µã¼ä¾àx=
£¨1£©ÒÑÖª´òµã¼ÆʱÆ÷µçԴƵÂÊΪ50Hz£¬ÔòÖ½´øÉÏ´òÏàÁÚÁ½µãµÄʱ¼ä¼ä¸ôΪ
0.02s
0.02s
£®£¨2£©A¡¢B¡¢C¡¢DÊÇÖ½´øÉÏËĸö¼ÆÊýµã£¬Ã¿Á½¸öÏàÁÚ¼ÆÊýµã¼äÓÐËĸöµãûÓл³ö£¬´ÓͼÖжÁ³öA¡¢BÁ½µã¼ä¾àx=
0.65
0.65
cm£»Cµã¶ÔÓ¦µÄËÙ¶ÈÊÇ0.10
0.10
m/s£¬¼ÓËÙ¶ÈÊÇ0.30
0.30
m/s2£¨ËٶȺͼÓËٶȵļÆËã½á¹û±£ÁôÁ½Î»ÓÐЧÊý×Ö£©·ÖÎö£º´òµã¼ÆʱÆ÷´òµãÖÜÆÚÓë½»±äµçÁ÷µÄÖÜÆÚÏàͬ£®ÓÉt=0.02s£¨n-1£©£¬Ëã³ö¼ÆÊýµã¼äµÄʱ¼ä¸ôT£¬Ö½´øʵÑéÖУ¬ÈôÖ½´øÔȱäËÙÖ±ÏßÔ˶¯£¬²âµÃÖ½´øÉϵĵã¼ä¾à£¬ÀûÓÃÔȱäËÙÖ±ÏßÔ˶¯µÄÍÆÂÛ£¬¿É¼ÆËã³ö´ò³öijµãʱֽ´øÔ˶¯µÄ˲ʱËٶȺͼÓËٶȣ®
½â´ð£º½â£º£¨1£©Ö½´øÉÏ´òÏàÁÚÁ½µãµÄʱ¼ä¼ä¸ôT=
=
s=0.02s£®
£¨2£©A¡¢B¼äµÄ¾àÀëx=0.65cm£®B¡¢D¼äµÄ¾àÀëÊÇ2.05cm£¬Ê±¼ä¼ä¸ôT=0.2s£¬Ôòvc=
m/s=0.10m/s£®Óɹ«Ê½¡÷x=at2Öªa=
=
£¬
´úÈëÊý¾Ý½âµÃa=0.30m/s2£®
¹Ê´ð°¸Îª£º£¨1£©0.02s £¨2£©0.65£» 0.10£» 0.30
1 |
f |
1 |
50 |
£¨2£©A¡¢B¼äµÄ¾àÀëx=0.65cm£®B¡¢D¼äµÄ¾àÀëÊÇ2.05cm£¬Ê±¼ä¼ä¸ôT=0.2s£¬Ôòvc=
2.05¡Á10-2 |
0.2 |
¡÷x |
t2 |
xBC-xAB |
t2 |
´úÈëÊý¾Ý½âµÃa=0.30m/s2£®
¹Ê´ð°¸Îª£º£¨1£©0.02s £¨2£©0.65£» 0.10£» 0.30
µãÆÀ£ºÄܹ»ÖªµÀÏàÁڵļÆÊýµãÖ®¼äµÄʱ¼ä¼ä¸ô£®
ҪעÒⵥλµÄ»»ËãºÍÓÐЧÊý×ֵı£Áô£®
Á˽âÖð²î·¨Çó½â¼ÓËÙ¶ÈÓÐÀûÓÚ¼õСÎó²î£®
ҪעÒⵥλµÄ»»ËãºÍÓÐЧÊý×ֵı£Áô£®
Á˽âÖð²î·¨Çó½â¼ÓËÙ¶ÈÓÐÀûÓÚ¼õСÎó²î£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿