ÌâÄ¿ÄÚÈÝ
1£®Ò»ÁÐÑØxÖáÕý·½Ïò´«²¥µÄ¼òгºá²¨ÔÚt=0ʱ¿ÌµÄ²¨ÐÎÈçͼËùʾ¡¢ÖʵãPµÄx×ø±êΪ3m£®ÒÑÖªÈÎÒâÕñ¶¯ÖʵãÁ¬Ðø2´Î¾¹ýƽºâλÖõÄʱ¼ä¼ä¸ôΪ0.4s£®ÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©A£® | ²¨µÄƵÂÊΪ1.25Hz | |
B£® | ²¨ËÙΪ4m/s | |
C£® | x×ø±êΪ22mµÄÖʵãÔÚt=0.2sʱǡºÃλÓÚ²¨·å | |
D£® | x×ø±êΪ15mµÄÖʵãÔÚt=0.6ʱǡºÃλÓÚ²¨¹È | |
E£® | µ±ÖʵãpλÓÚ²¨·åʱ£¬x×ø±êΪI7mµÄÖʵãÇ¡ºÃλÓÚ²¨¹È |
·ÖÎö ¸ù¾ÝÈÎÒâÕñ¶¯ÖʵãÁ¬Ðø2´Î¾¹ýƽºâλÖõÄʱ¼ä¼ä¸ôΪ°ë¸öÖÜÆÚ£¬¼´¿ÉÇó³öÖÜÆÚ£®ÏàÁÚÁ½¸ö²¨·å»ò²¨¹ÈÖ®¼äµÄ¾àÀëµÈÓÚ²¨³¤£¬ÓÉͼ¶Á³ö²¨³¤£®ÓÉv=$\frac{¦Ë}{T}$Çó³ö²¨ËÙ£®¸ù¾ÝÁ½¸öÖʵãƽºâλÖüä¾àÀëÓ벨³¤µÄ¹Øϵ£¬·ÖÎöËüÃÇ״̬¹Øϵ£®
½â´ð ½â£ºA¡¢ÒÑÖªÈÎÒâÕñ¶¯ÖʵãÁ¬Ðø2´Î¾¹ýƽºâλÖõÄʱ¼ä¼ä¸ôΪ0.4s£¬Ôò¸Ã²¨µÄÖÜÆÚΪ T=2¡Á0.4s=0.8s£¬ÆµÂÊΪ f=$\frac{1}{T}$=1.25Hz£¬¹ÊAÕýÈ·£®
B¡¢ÓÉͼ¿ÉÖª£¬¸Ã²¨µÄ²¨³¤ÊÇ ¦Ë=4m£¬ËùÒÔ²¨ËÙΪ£ºv=$\frac{¦Ë}{T}$=$\frac{4}{0.8}$m/s=5m/s£®¹ÊB´íÎó£»
C¡¢x×ø±êΪ22mµÄÖʵ㵽x=2ÖʵãµÄ¾àÀëΪ£º¡÷x=22m-2m=20m=5¦Ë£¬ËùÒÔx×ø±êΪ22mµÄÖʵãÓëx=2´¦Öʵ㲽µ÷Ïàͬ£¬Õñ¶¯Çé¿öʼÖÕÏàͬ£®t=0ʱ¿Ìx=2mµÄÖʵãÏòÉÏÕñ¶¯£¬¾¹ýt=0.2s=$\frac{T}{4}$ʱ¼äÇ¡ºÃµ½´ï²¨·å£¬ËùÒÔx×ø±êΪ22mµÄÖʵãÔÚt=0.2sʱǡºÃλÓÚ²¨·åλÖ㮹ÊCÕýÈ·£»
D¡¢x×ø±êΪ15mµÄÖʵ㵽x=3ÖʵãµÄ¾àÀëΪ£º¡÷x2=15m-2m=12m=3¦Ë£¬ËùÒÔx×ø±êΪ15mµÄÖʵãÓëx=3´¦Öʵ㲽µ÷Ïàͬ£¬Õñ¶¯Çé¿öʼÖÕÏàͬ£®t=0ʱ¿Ìx=3mµÄÖʵãλÓÚ²¨¹È£¬¾¹ýt=0.6s=$\frac{3T}{4}$ʱ¼äÇ¡ºÃµ½´ïƽºâλÖã¬ËùÒÔx×ø±êΪ15mµÄÖʵãÔÚt=0.6ʱǡºÃλÓÚƽºâλÖ㮹ÊD´íÎó£»
E¡¢x×ø±êΪ17mµÄÖʵ㵽PµãµÄ¾àÀëΪ£º¡÷x1=17m-3m=14m=3$\frac{1}{2}$¦Ë£¬ËùÒÔx×ø±êΪ17mµÄÖʵãÓëPµãµÄÕñ¶¯Ê¼ÖÕÏà·´£¬µ±ÖʵãPλÓÚ²¨·åʱ£¬x×ø±êΪ17mµÄÖʵãÇ¡ºÃλÓÚ²¨¹È£®¹ÊEÕýÈ·£®
¹ÊÑ¡£ºACE
µãÆÀ ¸ù¾ÝÖʵãµÄÕñ¶¯·½ÏòÅжϲ¨µÄ´«²¥·½Ïò£¬¿ÉÒÔ²ÉÓñȽÏÖʵãÕñ¶¯ÏȺóµÄ·½·¨£º²¨´ÓÕñ¶¯ÔçµÄÖʵãÏòÕñ¶¯³ÙµÄÖʵ㴫²¥£®ÅжÏÁ½¸öÖʵã״̬¹ØϵҪ¸ù¾ÝËüÃÇÏà¾àµÄ¾àÀëÓ벨³¤µÄ¹Øϵ·ÖÎö£®
A£® | Ô×ÓȺB×î¶à¿ÉÄÜ·øÉä³ö2ÖÖƵÂʵĹâ×Ó | |
B£® | Ô×ÓȺAÄܹ»ÎüÊÕÔ×ÓB·¢³öµÄ¹â×Ó²¢Ô¾Ç¨µ½n=4µÄÄܼ¶ | |
C£® | ÈôҪʹÔ×ÓȺA·¢ÉúµçÀ룬ËùÎüÊյĹâ×ÓµÄÄÜÁ¿¿ÉÒÔ´óÓÚ3.4eV | |
D£® | ÈôÔ×ÓȺA·øÉä³öµÄ¹âÄÜʹij½ðÊô·¢Éú¹âµçЧӦ£¬ÔòÔ×ÓȺB¿ÉÄÜ·øÉä³öµÄËùÓйâÒ²¶¼ÄÜʹ¸Ã½ðÊô·¢Éú¹âµçЧӦ |
A£® | ÎïÌåÊܵ½µÄĦ²ÁÁ¦Ò»Ö±Ôö´ó | B£® | Îï¿éÊܵ½µÄĦ²ÁÁ¦ÏÈÔö´óºó²»±ä | ||
C£® | Îï¿éÊܵ½µ¯»ÉµÄµ¯Á¦Ò»Ö±Ôö´ó | D£® | Îï¿éÊܵ½µ¯»ÉµÄµ¯Á¦ÏȲ»±äºóÔö´ó |
A£® | Èô¼×¡¢ÒÒÁ½ÎïÌåÓëˮƽÃ涯Ħ²ÁÒòÊýÏàͬ£¬Ôò¼×µÄÖÊÁ¿½Ï´ó | |
B£® | Èô¼×¡¢ÒÒÁ½ÎïÌåÓëˮƽÃ涯Ħ²ÁÒòÊýÏàͬ£¬ÔòÒÒµÄÖÊÁ¿½Ï´ó | |
C£® | ¼×ÓëµØÃæ¼äµÄ¶¯Ä¦²ÁÒòÊýÒ»¶¨´óÓÚÒÒÓëµØÃæµÄ¶¯Ä¦²ÁÒòÊý | |
D£® | ¼×ÓëµØÃæ¼äµÄ¶¯Ä¦²ÁÒòÊýÒ»¶¨Ð¡ÓÚÒÒÓëµØÃæµÄ¶¯Ä¦²ÁÒòÊý |
A£® | Ô˶¯ËٶȴóµÄÎïÌå²»ÄܺܿìµØÍ£ÏÂÀ´£¬ÊÇÒòΪÎïÌåËÙ¶ÈÔ½´ó£¬¹ßÐÔÒ²Ô½´ó | |
B£® | ¾²Ö¹µÄ»ð³µÆð¶¯Ê±£¬Ëٶȱ仯Âý£¬ÊÇÒòΪ¾²Ö¹µÄÎïÌå¹ßÐÔ´óµÄÔµ¹Ê | |
C£® | ƹÅÒÇò¿ÉÒÔ¿ìËÙ³éɱ£¬ÊÇÒòΪƹÅÒÇò¹ßÐÔС | |
D£® | ÔÚ¡°ÉñÖÛ¡±ÁùºÅ·É´¬ÖеÄÎïÌåÒ²´æÔÚ¹ßÐÔ |
A£® | 0 | B£® | F | C£® | Fsin¦È | D£® | Fcos¦È |
A£® | v0 | B£® | gt | C£® | $\sqrt{{v}_{0}^{2}+£¨gt£©^{2}}$ | D£® | $\sqrt{£¨{v}_{0}t£©^{2}+£¨\frac{1}{2}g{t}^{2}£©^{2}}$ |