2£®Æøµæµ¼¹ì×°ÖÃÊÇÎïÀíѧʵÑéµÄÖØÒªÒÇÆ÷£¬¿ÉÒÔÓÃÀ´¡°Ñо¿ÔȱäËÙÖ±ÏßÔ˶¯¡±¡¢¡°ÑéÖ¤»úеÄÜÊغ㶨ÂÉ¡±¡¢¡°Ì½¾¿¶¯Äܶ¨Àí¡±µÈ£®
¢ÙijѧϰС×éÔÚ¡°Ñо¿ÔȱäËÙÖ±ÏßÔ˶¯¡±µÄʵÑéÖУ¬ÓÃÈçͼËùʾµÄÆøµæµ¼¹ì×°ÖÃÀ´²âС³µµÄ¼ÓËٶȣ¬Óɵ¼¹ì±ê³ß¿ÉÒÔ²â³öÁ½¸ö¹âµçÃÅÖ®¼äµÄ¾àÀëL£¬Õ­ÕÚ¹â°åµÄ¿í¶ÈΪd£¬Õ­ÕÚ¹â°åÒÀ´Îͨ¹ýÁ½¸ö¹âµçÃŵÄʱ¼ä·Ö±ðΪt1¡¢t2£¬µ±µØÇòµÄÖØÁ¦¼ÓËÙ¶ÈΪg£¬Ôò»¬¿éµÄ¼ÓËٶȿÉÒÔ±íʾΪa=$\frac{{d}^{2}}{2L}$£¨$\frac{1}{{t}_{2}^{2}}$-$\frac{1}{{t}_{1}^{2}}$£©£®£¨ÓÃÌâÖÐËù¸øÎïÀíÁ¿±íʾ£©
£¨2£©¸ÃѧϰС×éÔÚ²â³ö»¬¿éµÄ¼ÓËٶȺ󣬾­·ÖÎöÌÖÂÛ£¬ÓÉÓÚ»¬¿éÔÚÆøµæµ¼¹ìÉÏÔ˶¯Ê±¿ÕÆø×èÁ¦ºÜС£¬¿ÉºöÂÔ£¬ËùÒÔ¿ÉÓÃÉÏÊöʵÑé×°ÖÃÀ´ÑéÖ¤»úеÄÜÊغ㶨ÂÉ£¬ÎªÑéÖ¤»úеÄÜÊغ㶨ÂÉ»¹Ðè²âÁ¿µÄÎïÀíÁ¿ÊÇ»¬¿éºÍµ²¹âÌõµÄ×ÜÖÊÁ¿M¡¢É³Í°µÄÖÊÁ¿m£®»úеÄÜÊغãµÄ±í´ïʽΪ$\frac{1}{2}$£¨M+m£©£¨$\frac{d}{{t}_{2}}$£©2-$\frac{1}{2}$£¨M+m£©£¨$\frac{d}{{t}_{1}}$£©2=mgL£¨ÓÃÌâÖÐËù¸øÎïÀíÁ¿ºÍ²âÁ¿µÄÎïÀíÁ¿±íʾ£©

·ÖÎö ÓÉÓÚÕÚ¹âÌõͨ¹ý¹âµçÃŵÄʱ¼ä¼«¶Ì£¬¿ÉÒÔÓÃƽ¾ùËٶȱíʾ˲ʱËٶȣ®¸ù¾ÝÔȱäËÙÖ±ÏßÔ˶¯µÄËÙ¶ÈλÒƹ«Ê½Çó³ö»¬¿éµÄ¼ÓËٶȣ®
¸ù¾Ý¹¦ÄܹØϵµÃÖØÁ¦×ö¹¦µÄÊýÖµµÈÓÚÖØÁ¦ÊÆÄܼõСÁ¿£®Òª×¢Òâ±¾ÌâµÄÑо¿¶ÔÏóÊÇϵͳ£®

½â´ð ½â£º£¨1£©ÓÉÓÚÕÚ¹âÌõͨ¹ý¹âµçÃŵÄʱ¼ä¼«¶Ì£¬¿ÉÒÔÓÃƽ¾ùËٶȱíʾ˲ʱËٶȣ®
»¬¿é¾­¹ý¹âµçÃÅ1ʱµÄ˲ʱËٶȵıí´ïʽv1=$\frac{d}{{t}_{1}}$£¬
»¬¿é¾­¹ý¹âµçÃÅ2ʱµÄ˲ʱËٶȵıí´ïʽv2=$\frac{d}{{t}_{2}}$£®
¸ù¾Ý${v}_{2}^{2}$-${v}_{1}^{2}$=2aLµÃ£¬
a=$\frac{{d}^{2}}{2L}$£¨$\frac{1}{{t}_{2}^{2}}$-$\frac{1}{{t}_{1}^{2}}$£©
£¨2£©ÏµÍ³µÄ×ܶ¯Äܱ仯·Ö±ðΪ£º$\frac{1}{2}$£¨M+m£©£¨$\frac{d}{{t}_{2}}$£©2-$\frac{1}{2}$£¨M+m£©£¨$\frac{d}{{t}_{1}}$£©2£»
ÔÚ»¬¿é´Ó¹âµçÃÅ1Ô˶¯µ½¹âµçÃÅ2µÄ¹ý³ÌÖУ¬ÏµÍ³ÊÆÄܵļõÉÙ¡÷Ep=mgL
Èç¹ûÂú×ã¹Øϵʽ¡÷Ep=Ek2-Ek1£¬¼´ÏµÍ³ÖØÁ¦ÊÆÄܼõСÁ¿µÈÓÚ¶¯ÄÜÔö¼ÓÁ¿£¬Ôò¿ÉÈÏΪÑéÖ¤ÁË»úеÄÜÊغ㶨ÂÉ£®
ËùÒÔ±¾ÊµÑ黹ÐèÒªÓÃÒÇÆ÷²âÁ¿µÄÎïÀíÁ¿ÊÇ»¬¿éºÍµ²¹âÌõµÄ×ÜÖÊÁ¿M¡¢É³Í°µÄ×ÜÖÊÁ¿m£¬
»úеÄÜÊغãµÄ±í´ïʽ$\frac{1}{2}$£¨M+m£©£¨$\frac{d}{{t}_{2}}$£©2-$\frac{1}{2}$£¨M+m£©£¨$\frac{d}{{t}_{1}}$£©2=mgL
¹Ê´ð°¸Îª£º£¨1£©$\frac{{d}^{2}}{2L}$£¨$\frac{1}{{t}_{2}^{2}}$-$\frac{1}{{t}_{1}^{2}}$£©£»
£¨2£©»¬¿éºÍµ²¹âÌõµÄ×ÜÖÊÁ¿M¡¢É³Í°µÄÖÊÁ¿m£¬$\frac{1}{2}$£¨M+m£©£¨$\frac{d}{{t}_{2}}$£©2-$\frac{1}{2}$£¨M+m£©£¨$\frac{d}{{t}_{1}}$£©2=mgL£®

µãÆÀ ½â¾ö¸ÃÌâ¹Ø¼üÕÆÎÕÖªµÀÔÚ¼«¶Ìʱ¼äÄÚµÄƽ¾ùËٶȿÉÒÔ±íʾ˲ʱËٶȺÍÔȱäËÙÖ±ÏßÔ˶¯µÄËÙ¶ÈλÒƹ«Ê½Ó¦Óã®

Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º¶àÑ¡Ìâ

12£®º£ÑóÖÐÔ̲Øמ޴óµÄÄÜÁ¿£¬ÀûÓú£ÑóµÄ²¨ÀË¿ÉÒÔ·¢µç£¬ÔÚÎÒ¹úÄϺ£ÉÏÓÐÒ»¸¡Í²Ê½²¨ÀË·¢µçµÆËþ£¬ÆäÔ­ÀíʾÒâͼÈçͼ¼×Ëùʾ£¬¸¡Í°ÄڵĴÅÌåͨ¹ýÖ§Öù¹Ì¶¨ÔÚ°µ½¸ÉÏ£¬¸¡Í°ÄÚÖÃÏßȦË沨ÀËÏà¶Ô´ÅÌåÑØÊúÖ±·½ÏòÔ˶¯£¬ÇÒʼÖÕ´¦Óڴų¡ÖУ¬¸ÃÏßȦÓë×èÖµR=15¦¸µÄµÆÅÝÏàÁ¬£®¸¡Í°Ï²¿ÓÉÄÚ¡¢ÍâÁ½ÃÜ·âԲͲ¹¹³É£¬£¨Í¼ÒÒÖÐбÏßÒõÓ°²¿·Ö£©£¬ÈçͼÒÒËùʾ£¬ÆäÄÚΪ²úÉú´Å³¡µÄ´ÅÌ壬Ó븡ͰÄÚ²àÃæµÄ·ì϶ºöÂÔ²»¼Æ£»ÔÑÊýN=200µÄÏßȦËùÔÚ´¦·øÏò´Å³¡µÄ´Å¸ÐӦǿ¶ÈB=0.2T£¬ÏßȦֱ¾¶D=0.4m£¬µç×èr=1¦¸£®È¡ÖØÁ¦¼ÓËÙ¶Èg=10m/s2£¬¦Ð2¡Ö10£¬Èô¸¡Í²Ë沨ÀËÉÏÏÂÔ˶¯µÄËٶȿɱíʾΪv=0.4¦Ðsin£¨¦Ðt£©m/s£¬ÔòÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£®µÆÅݵĵ繦ÂÊΪ120W
B£®²¨ÀË·¢µç²úÉúµç¶¯ÊÆeµÄ˲¼ä±í´ïʽΪc=16sin£¨¦Ðt£©V
C£®µÆÅÝÁ½¶ËµçѹµÄÓÐЧֵΪ$\frac{15\sqrt{2}}{2}$V
D£®µÆÅÝÖеçÁ÷iµÄ˲ʱ±í´ïʽΪi=4sin£¨¦Ðt£©A

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

13£®ÇáºËµÄ¾Û±ä·´Ó¦»áÊÍ·Å´óÁ¿µÄÄÜÁ¿£¬Í¬Ê±ºË¾Û±ä²úÎïÒ»°ã²»»áÎÛȾ»·¾³£¬ÊÇÈËÀà»ñµÃÄÜÔ´µÄÀíÏ뷽ʽ£®ºË¾Û±ä·´Ó¦¹ý³ÌÖ÷ÒªÊÇÒÔÏÂËÄÖÖ
${\;}_{1}^{2}$H+${\;}_{1}^{2}$H¡ú${\;}_{2}^{3}$He+X1+3.27MeV
${\;}_{1}^{2}$H+${\;}_{1}^{2}$H¡ú${\;}_{1}^{3}$H+X2+4.04MeV
${\;}_{1}^{2}$H+${\;}_{1}^{3}$H¡ú${\;}_{2}^{4}$He+X3+17.85MeV
${\;}_{1}^{2}$H+${\;}_{2}^{3}$He¡ú${\;}_{2}^{4}$He+X4+18.34MeV
¶ÔÉÏÃæµÄ·´Ó¦ÖеÄX1¡¢X2¡¢X3¡¢X4£¬ÊôÓÚÖÐ×ÓµÄÊÇ£¨¡¡¡¡£©
A£®X1¡¢X2¡¢X3¡¢X4B£®X2¡¢X3¡¢X4C£®X3¡¢X4D£®X1¡¢X3

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

10£®ÔÚÔÈÇ¿´Å³¡ÖУ¬Ò»¾ØÐνðÊôÏßȦÈÆÓë´Å³¡·½Ïò´¹Ö±µÄÖáÔÈËÙת¶¯£¬²úÉúµÄµç¶¯ÊÆËæʱ¼ä±ä»¯µÄͼÏóÈçͼËùʾ£®Ôò£¨¡¡¡¡£©
A£®t=0ʱ¿ÌÏßȦƽÃæÓëÖÐÐÔÃæÖغÏB£®t=0.01sʱ´©¹ýÏßȦµÄ´ÅͨÁ¿×îС
C£®µç¶¯ÊƵÄƵÂÊΪ0.02HzD£®µç¶¯ÊƵÄÓÐЧֵΪ31IV

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

17£®ÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£®·Ö×ÓÁ¦¼õСʱ£¬·Ö×ÓÊÆÄÜÒ²Ò»¶¨¼õС
B£®Ö»ÒªÄܼõÈõ·Ö×ÓÈÈÔ˶¯µÄ¾çÁҳ̶ȣ¬ÎïÌåµÄζȾͿÉÒÔ½µµÍ
C£®À©É¢ºÍ²¼ÀÊÔ˶¯µÄʵÖÊÊÇÏàͬµÄ£¬¶¼ÊÇ·Ö×ÓµÄÎÞ¹æÔòÔ˶¯
D£®·Ö×Ó¼äµÄ¾àÀër´æÔÚijһֵr0£¬µ±r´óÓÚr0ʱ£¬·Ö×Ó¼ä³âÁ¦´óÓÚÒýÁ¦£»µ±rСÓÚr0ʱ£¬·Ö×Ó¼ä³âÁ¦Ð¡ÓÚÒýÁ¦

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º¶àÑ¡Ìâ

3£®´¹Ö±Ö½ÃæÏòÍâµÄÔÈÇ¿´Å³¡×ó±ß½çÇ¡ºÃÓëͬһƽÃæÄÚµÄÕý·½ÐνðÊôµ¼Ïß¿òÓұ߽çÖغϣ¬±ß½çÊúÖ±£¬ÔÚÍâÁ¦×÷ÓÃÏ£¬µ¼Ïß¿òÔȼÓËÙ½øÈë´Å³¡ÇøÓò£¬ÒÔ˳ʱÕë·½ÏòΪ¸ÐÓ¦µçÁ÷Õý·½Ïò£¬ÍâÁ¦´óСÓÃF±íʾ£¬¸ÐÓ¦µçÁ÷µÄµç¹¦ÂÊÓÃP±íʾ£¬Í¨¹ýÏß¿òµÄµçºÉÁ¿ÓÃQ±íʾ£¬¸ÐÓ¦µçÁ÷´óСÓÃI±íʾ£¬ÆäÖÐP-tͼÏóΪÅ×ÎïÏߣ®ÔòÔÚÏß¿òÔȼÓËÙ½ø´Å³¡µÄ0-t1¹ý³Ì£¬ÕâЩÁ¿Ëæʱ¼ä±ä»¯µÄͼÏó¹ØϵÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£®B£®C£®D£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

10£®ÏÂÁÐ˵·¨²»ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£®¶ÔÓÚÒ»¶¨ÖÊÁ¿µÄÀíÏëÆøÌ壬ÈôÆøÌåµÄѹǿºÍÌå»ý¶¼·¢Éú±ä»¯£¬ÆäÄÚÄÜ¿ÉÄܲ»±ä
B£®¶ÔÓÚÃÜ·âÔÚÈÝ»ý²»±äµÄÈÝÆ÷ÄÚµÄÀíÏëÆøÌ壬ÈôÆøÌåζÈÉý¸ß£¬ÔòÆøÌåÒ»¶¨´ÓÍâ½çÎüÈÈ
C£®ÍÑÖ¬ÃÞÍÑÖ¬µÄÄ¿µÄ£¬ÔÚÓÚʹËü´Ó²»Äܱ»Ë®½þÈó±äΪ¿ÉÒÔ±»Ë®½þÈó£¬ÒÔ±ãÎüÈ¡Ò©Òº
D£®ÒºÌå±íÃæ´æÔÚ×ÅÕÅÁ¦ÊÇÒòΪҺÌåÄÚ²¿·Ö×Ó¼äµÄ¾àÀë´óÓÚÒºÌå±íÃæ²ã·Ö×Ó¼äµÄ¾àÀë

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

7£®µç´Å²¨ÎÞ´¦²»ÔÚ£¬ÎÒÃÇÉí±ßµÄ¹ã²¥¡¢µçÊÓ¡¢Òƶ¯Í¨ÐŶ¼Óëµç´Å²¨ÓÐ×ÅÃܲ»¿É·ÖµÄÁªÏµ£¬Wi-Fi¡¢·Ç½Ó´¥Ê½¹«½»¿¨¡¢µ¼º½¡¢À״΢²¨¼ÓÈÈ¡¢ÉäµçÌìÎÄѧ¡¢Ò£¸ÐÒ£²âÒ²¶¼Óëµç´Å²¨Óйأ®ÆµÂÊÊǵç´Å²¨µÄÒ»¸öÖØÒª²ÎÁ¿£¬²»Í¬ÆµÂʵĵç´Å²¨ÔÚ¿ÕÖл¥²»¸ÉÈÅ£¬±£Ö¤Á˸÷ÏîÎÞÏßµçÓ¦ÓõÄ˳Àû¿ªÕ¹£®ÀýÈ磬ÎÒ¹ú×ÔÖ÷½¨Á¢µÄ±±¶·µ¼º½ÏµÍ³ËùʹÓõĵç´Å²¨ÆµÂÊԼΪ1561MHz£»¼ÒÓÃ΢²¨Â¯¼ÓÈÈʳÎïËùʹÓõĵç´Å²¨ÆµÂÊԼΪ2450MHz£»¼ÒÓÃ5GWi-FiËùʹÓõĵç´Å²¨ÆµÂÊԼΪ5725MHz£®¶ÔÓÚ¼ÒÓÃ5GWi-FiµÄÐźţ¬ÏÂÁÐ˵·¨ÖÐÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£®Ò»¶¨²»»á²úÉúÆ«ÕñÏÖÏó
B£®´ÓÒ»¸ö·¿¼ä´©Ô½Ç½±Ú½øÈëÁíÒ»¸ö·¿¼äºó£¬ÆµÂʱ£³Ö²»±ä
C£®Óë±±¶·µ¼º½Ðźŵþ¼Óʱ£¬½«²úÉúÃ÷ÏԵĸÉÉæÏÖÏó
D£®Óë΢²¨Â¯ËùʹÓõÄ΢²¨Ïà±È£¬¸üÈÝÒײúÉúÃ÷ÏÔÑܵÄÉäÏÖÏó

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º¶àÑ¡Ìâ

8£®¾²Ö¹ÔÚˮƽµØÃæÉϵÄÎï¿é£¬Êܵ½Ë®Æ½Á¦FµÄ×÷Óã¬FÓëʱ¼ätµÄ¹ØϵÈçͼ¼×Ëùʾ£¬Îï¿éµÄ¼ÓËÙ¶ÈaÓëʱ¼ätµÄ¹ØϵÈçͼÒÒËùʾ£¬gÈ¡10m/s2£¬É軬¶¯Ä¦²ÁÁ¦µÈÓÚ×î´ó¾²Ä¦²ÁÁ¦£¬¸ù¾ÝͼÏóÐÅÏ¢¿ÉµÃ£¨¡¡¡¡£©
A£®µØÃæ¶ÔÎï¿éµÄ×î´ó¾²Ä¦²ÁÁ¦Îª1N
B£®4sÄ©ÍÆÁ¦FµÄ˲ʱ¹¦ÂÊΪ36W
C£®Îï¿éÓëµØÃæ¼äµÄ»¬¶¯Ä¦²ÁÒòÊýΪ0.2
D£®Îï¿éµÄÖÊÁ¿Îª2kg

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸