ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾΪһÁÐÑØXÖáÕý·½Ïò´«²¥µÄ¼òгºá²¨ÔÚt=0ʱµÄ²¨ÐÎͼ£¬ÖʵãP¡¢QµÄƽºâλÖ÷ֱðλÓÚx=0.20mºÍx=0.60m´¦¡£Èô²¨µÄ´«²¥ËÙ¶ÈΪ2.0m/s£¬ÔòÏÂÁÐ˵·¨ÖÐÕýÈ·µÄÊÇ
A£®ÔÙ¾¹ýt=-0.40s£¬ÖʵãPÏòÓÒÒƶ¯0.80m |
B£®ÔÙ¾¹ýt=0.40s£¬ÖʵãPÕýͨ¹ý×Ô¼ºµÄƽºâλÖã¬Õâ¶Îʱ¼äÄÚËüͨ¹ýµÄ·³ÌΪ0.40m |
C£®ÔÚt=0ʱ¿ÌÖ®ºó£¬ÖʵãQºÍPµÄλÒƺÍËٶȵķ½Ïò×ÜÊÇÏà·´µÄ |
D£®ÔÙ¾¹ýt=0.10s£¬ÔÚxÖáÉÏ0~0.60m·¶Î§ÄÚ²¨ÐÎͼÓët=0ʱµÄ²¨ÐÎͼÏàͬ |
B
¸ú¾ÝͼÏñ¿ÉÖª²¨³¤Îª0.4cm£¬ÖÜÆÚ£¬ÔÙ¾¹ýt=-0.40s£¬ÖʵãPÖ»ÊÇÔÚ×Ô¼ºµÄƽºâλÖÃ×÷¼òгÕñ¶¯£¬²»»áË沨ǨÒÆ£¬¹ÊA´íÎó
Ò»¸öÖÜÆÚÖʵãÔ˶¯µÄ·³ÌΪ4¸öÕñ·ù£¨4¡Á5=20cm£©£¬0.4sÊÇÁ½¸öÖÜÆÚ£¬Ô˶¯Â·³ÌΪ8¸öÕñ·ù£¨40cm=0.40m£©£¬¹ÊBÕýÈ·
ÔÚt=0ʱ¿ÌÖ®ºó£¬ÖʵãQºÍPÏà¾àÒ»¸ö²¨³¤£¬ËùÒÔÁ½ÖʵãµÄµÄλÒƺÍËٶȵķ½Ïò×ÜÊÇÏàͬµÄ£¬¹ÊC´íÎó
ÔÙ¾¹ýt=0.10s£¬ÊÇ°ë¸öÖÜÆÚ£¬ÔÚxÖáÉÏ0~0.60m·¶Î§ÄÚ²¨ÐÎͼÓët=0ʱµÄ²¨ÐÎͼÍêÈ«Ïà·´£¬¹ÊD´íÎó
¹ÊÑ¡B
Ò»¸öÖÜÆÚÖʵãÔ˶¯µÄ·³ÌΪ4¸öÕñ·ù£¨4¡Á5=20cm£©£¬0.4sÊÇÁ½¸öÖÜÆÚ£¬Ô˶¯Â·³ÌΪ8¸öÕñ·ù£¨40cm=0.40m£©£¬¹ÊBÕýÈ·
ÔÚt=0ʱ¿ÌÖ®ºó£¬ÖʵãQºÍPÏà¾àÒ»¸ö²¨³¤£¬ËùÒÔÁ½ÖʵãµÄµÄλÒƺÍËٶȵķ½Ïò×ÜÊÇÏàͬµÄ£¬¹ÊC´íÎó
ÔÙ¾¹ýt=0.10s£¬ÊÇ°ë¸öÖÜÆÚ£¬ÔÚxÖáÉÏ0~0.60m·¶Î§ÄÚ²¨ÐÎͼÓët=0ʱµÄ²¨ÐÎͼÍêÈ«Ïà·´£¬¹ÊD´íÎó
¹ÊÑ¡B
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿