ÌâÄ¿ÄÚÈÝ
11£®Èçͼ£¬ÔÚ×ø±êϵxOyµÄµÚÒ»ÏóÏÞÄÚÓÐÒÔOΪԲÐÄ£¬°ë¾¶·Ö±ðΪR¡¢2R¡¢3RµÄÔ²»¡ab¡¢cd¡¢ef¼°Á½×ø±êÖáΧ³ÉµÄI¡¢II¡¢IIIÈý¸öÇøÓò£¬I¡¢IIÇøÓòÖдæÔÚ×ŴŸÐӦǿ¶È´óС¾ùΪB0µÄÔÈÇ¿´Å³¡£¬ÆäÖÐIÇøÓòµÄ´Å³¡·½Ïò´¹Ö±×ø±êƽÃæÏòÀï¡¢IIÇøÓòµÄ´Å³¡·½Ïò´¹Ö±×ø±êƽÃæÏòÍ⣬һÖÊÁ¿Îªm¡¢µçºÉÁ¿ÎªqµÄ´øÕýµçµÄÁ£×Ó£¬ÒÔËÙ¶Èv=$\frac{q{B}_{0}R}{m}$´Ó×ø±êÔµãOÑØ+x·½ÏòÉäÈë´Å³¡£¬²»¼ÆÁ£×ÓÖØÁ¦£®£¨1£©ÇóÁ£×ÓÓ뻡ab½»µãµÄ×ø±êÖµx1¡¢y1£»
£¨2£©ÇóÁ£×ÓÔÚI¡¢IIÁ½ÇøÓòÖÐÔ˶¯µÄ×Üʱ¼ät£»
£¨3£©ÈôIIIÇøÓòÖÐÒ²´æÔÚ×Å´¹Ö±×ø±êƽÃæµÄÔÈÇ¿´Å³¡£¬ÎªÊ¹Á£×Ó²»´Ó»¡efÉÏÉä³ö´Å³¡£¬Çó¸ÃÇøÓò´Å³¡·½Ïò»ú´Å¸ÐӦǿ¶ÈBxµÄÈ¡Öµ·¶Î§£®
·ÖÎö £¨1£©¸ù¾ÝÂåÂ××ÈÁ¦ÌṩÏòÐÄÁ¦µÃµ½°ë¾¶¹«Ê½r=$\frac{mv}{qB}$£¬ÔÙÓëÌâÖÐÒÑÖªËÙ¶Èv½áºÏÇó³öÁ£×Ӱ뾶r£¬¸ù¾Ý¼¸ºÎ¹Øϵ½áºÏ¼´¿ÉÇó³öÁ£×ÓÓ뻡ab½»µãµÄºá×Ý×ø±ê£»
£¨2£©»³öÁ£×ÓÔ˶¯¹ì¼£¹ý³Ìͼ£¬ÀûÓÃËùת¹ýµÄ»¡³¤³ýÒÔËٶȴóС¼´¿ÉÇó³öÁ£×ÓÔ˶¯Ê±¼ä£»
£¨3£©ÓÉÓڴų¡·½Ïò²»È·¶¨£¬¹Ê´æÔÚÁ½ÖÖÇé¿ö£¬·ÖÇé¿öÌÖÂÛ£¬µ±IIIÇøÓòµÄ´Å³¡·½Ïò´¹Ö±×ø±êƽÃæÏòÍâºÍ´¹Ö±×ø±êƽÃæÏòÀïÁ½ÖÖÇé¿ö£¬ÕÒµ½ÁÙ½çÌõ¼þ£¬¼´¹ì¼£ÓëIIIÇøÓòµÄÍâ±ß½çÏàÇУ¬ÓÃÂåÂ××ÈÁ¦ÌṩÏòÐÄÁ¦ÓëÁٽ缸ºÎ¹Øϵ½áºÏ¼´¿ÉÇó³ö´Å¸ÐӦǿ¶ÈBxµÄÈ¡Öµ·¶Î§£®
½â´ð ½â£º£¨1£©Á£×ÓÔڴų¡ÖÐÔ˶¯Ê±£¬¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂɵãºqvB0=m$\frac{{v}^{2}}{r}$¢Ù
¸ù¾ÝÒÑÖª£ºv=$\frac{q{B}_{0}R}{m}$ ¢Ú
ÁªÁ¢¢Ù¢ÚʽµÃ£ºr=R
¼´Á£×ÓÔ˶¯¹ì¼£Ó뻡abµÄ½»µãA¼°a¡¢O×é³ÉÒ»ÕýÈý½ÇÐΣ¬Èçͼ1Ëùʾ£¬
¹ÊAµãµÄºá¡¢×Ý×ø±ê·Ö±ðΪ£º
x1=Rcos30¡ã
y1=Rsin30¡ã
½âµÃ£ºx1=$\frac{\sqrt{3}}{2}$R
y1=$\frac{1}{2}$R
£¨2£©Á£×ÓÔÚIÇøÓòµÄ¹ì¼£»¡³¤¶ÔÓ¦µÄÔ²ÐĽÇΪ$\frac{¦Ð}{3}$£¬½øÈëIIÇøÓòºó£¬Æ«×ª·½Ïò¸Ä±ä£¬¹ìµÀ°ë¾¶²»±ä£®
¹ì¼£Ó뻡cdµÄ½»µãCÓëA¡¢OÔÚÒ»ÌõÖ±ÏßÉÏ£¬Ô˶¯¹ì¼£Èçͼ2Ëùʾ£®
Á£×ÓÔÚI¡¢IIÁ½ÇøÓòµÄÔ˶¯¹ì¼£¶ÔÓ¦µÄÔ²ÐĽÇÏàµÈ£¬¹ÊÔ˶¯Ê±¼äÏàµÈ
Á£×Ó´ÓOµ½CµÄÔ˶¯Ê±¼ä
t=$\frac{2r\frac{¦Ð}{3}}{v}$
ÕûÀíµÃ£ºt=$\frac{2¦Ðm}{3q{B}_{0}}$
£¨3£©Á£×Ó¾¹ýCµãʱËÙ¶ÈÑØ+x·½Ïò£¬Óɼ¸ºÎ¹Øϵ¿ÉÖªCµãµÄ×ø±êÖµ
x2=$\sqrt{3}$R
y2=R
ÈôIIIÇøÓòµÄ´Å³¡·½ÏòÏòÍ⣬Á£×ÓÇ¡ºÃ´Ófµã¾¹ýʱ£¬¹ì¼£Èçͼ3Ëùʾ£®
Óɼ¸ºÎ¹Øϵ֪£º
£¨r3-y2£©2+£¨3R-x2£©2=${r}_{3}^{2}$
ÕûÀíµÃ£ºr3=$\frac{13-6\sqrt{3}}{2}R$¢Û
ÓÉ¢Ù¢ÛʽµÃ£ºBx=$\frac{2}{13-6\sqrt{3}}$B0=$\frac{26+12\sqrt{3}}{61}$B0
ÈôIIIÇøÓòÖеĴų¡·½ÏòÏòÀÁ£×ӵĹ켣ǡºÃÓ뻡efÏàÇÐʱ£¬¹ì¼£Èçͼ4Ëùʾ£®
Óɼ¸ºÎ¹Øϵ֪£ºOE=3R-r4
OE2=${x}_{2}^{2}$+£¨r4+y2£©2
ÕûÀíµÃ£ºr4=$\frac{5}{8}$R¢Ü
ÓÉ¢Ù¢ÜʽµÃ£ºBx=$\frac{8}{5}$B0
Ϊ±£Ö¤Á£×Ó²»´Ó»¡efÉÏÉä³ö´Å³¡£º
µ±IIIÇøÓòµÄ´Å³¡·½Ïò´¹Ö±×ø±êƽÃæÏòÍâʱ£¬´Å¸ÐӦǿ¶ÈÐëÂú×ã
Bx£¾$\frac{26+12\sqrt{3}}{61}$B0
µ±IIIÇøÓòµÄ´Å³¡·½Ïò´¹Ö±×ø±êƽÃæÏòÀïʱ£¬´Å¸ÐӦǿ¶ÈÐëÂú×ã
Bx¡Ý$\frac{8}{5}$B0
´ð£º£¨1£©ÇóÁ£×ÓÓ뻡ab½»µãµÄ×ø±êÖµx1Ϊ$\frac{\sqrt{3}}{2}$R£¬y1Ϊ$\frac{1}{2}$R£»
£¨2£©ÇóÁ£×ÓÔÚI¡¢IIÁ½ÇøÓòÖÐÔ˶¯µÄ×Üʱ¼ätΪ$\frac{2¦Ðm}{3q{B}_{0}}$£»
£¨3£©ÎªÊ¹Á£×Ó²»´Ó»¡efÉÏÉä³ö´Å³¡£¬µ±IIIÇøÓòµÄ´Å³¡·½Ïò´¹Ö±×ø±êƽÃæÏòÍâʱ£¬´Å¸ÐӦǿ¶ÈÐëÂú×ãBx£¾$\frac{26+12\sqrt{3}}{61}$B0 £¬µ±IIIÇøÓòµÄ´Å³¡·½Ïò´¹Ö±×ø±êƽÃæÏòÀïʱ£¬´Å¸ÐӦǿ¶ÈÐëÂú×ãBx¡Ý$\frac{8}{5}$B0£®
µãÆÀ ±¾Ì⿼²é´øµçÁ£×ÓÔڴų¡ÖеÄÔ˶¯£¬ÔËÓÃÂåÂ××ÈÁ¦ÌṩÏòÐÄÁ¦Ó뼸ºÎ¹Øϵ½áºÏµÄ·ÖÎö˼·ȥ½â¾ö£¬Çó½âÁ£×ÓÔڴų¡ÖÐÔ˶¯µÄʱ¼äʱ£¬Òª×¢Òâ·ÖÎöÁ£×ÓËùת¹ýµÄÔ²ÐĽǻò»¡³¤£»×¢ÒâµÚÈýÎÊÓÉÓÚδ˵Ã÷IIIÇøÓòµÄ´Å³¡·½Ïò£¬¹Ê´æÔÚ¶à½âÇé¿ö£®½âÌâ¹Ø¼üÊÇÒª·ÖºÃ¹ý³Ì£¬»³öÁ£×ÓµÄÔ˶¯¹ì¼££¬Ã÷È·Á£×Óÿһ¸ö¹ý³ÌµÄÔ˶¯£¬Ò»¶¨Òª¹æ·¶×÷ͼ£¬ÒÔ±ã¸ü¿ìµØÕÒµ½¼¸ºÎ¹Øϵ£¬Ìá¸ß½âÌâЧÂÊ£®
A£® | ÌÀķѷͨ¹ý¶Ô¦ÁÁ£×ÓÉ¢ÉäʵÑéµÄÑо¿£¬½ÒʾÁËÔ×ÓºËʽ½á¹¹ | |
B£® | ºË·´Ó¦·½³ÌʽΪ${\;}_{1}^{2}$H+${\;}_{1}^{3}$H¡ú${\;}_{2}^{4}$He+${\;}_{0}^{1}$nµÄ·´Ó¦ÊÇÒ»¸öÁѱ䷴Ӧ | |
C£® | ¸ù¾Ý²¨¶ûÀíÂÛ¿ÉÖª£¬ÇâÔ×Ó·øÉä³öÒ»¸ö¹â×Ӻ󣬺ËÍâµç×ÓµÄÔ˶¯ËÙ¶ÈÔö´ó | |
D£® | ¹âµçЧӦʵÑéÖУ¬Èô±£³ÖÈëÉä¹âµÄ¹âÇ¿²»±ä£¬²»¶ÏÔö´óÈëÉä¹âµÄƵÂÊ£¬Ôò¶ôÖ¹µçѹ¼õС |
A£® | СÇòÊÇ´Ó5m¸ß´¦×ÔÓÉÏÂÂäµÄ | B£® | СÇòÏÂÂäʱ¼äΪ0.5s | ||
C£® | ÅöײǰºóËٶȸıäÁ¿µÄ´óСΪ8m/s | D£® | СÇò·´µ¯µÄ×î´ó¸ß¶ÈΪ0.45m |
A£® | ÓеĹâÊDz¨£¬ÓеĹâÊÇÁ£×Ó | |
B£® | ¹âµÄƵÂÊÔ½¸ß£¬Æ䲨¶¯ÐÔÔ½Ã÷ÏÔ£»¹âµÄƵÂÊÔ½µÍ£¬ÆäÁ£×ÓÐÔÔ½Ã÷ÏÔ | |
C£® | ¹âµÄ²¨¶¯ÐÔ¿ÉÒÔ¿´×÷ÊÇ´óÁ¿¹â×ÓÔ˶¯µÄ¹æÂÉ | |
D£® | ¹âµçЧӦÏÖÏó·´Ó³Á˹âµÄ²¨¶¯ÐÔ |
A£® | t1=t2=t3£¬a1£¼a2£¼a3 | B£® | t2£¼t1£¼t3£¬a1£¼a3£¼a2 | ||
C£® | t1=t2£¼t3£¬a1£¼a2=a3 | D£® | t1=t3£¾t2£¬a1=a3£¼a2 |
A£® | Îï¿éB Êܵ½µÄĦ²ÁÁ¦ÏȼõСºóÔö´ó | |
B£® | µØÃæ¶ÔбÃæÌåµÄĦ²ÁÁ¦·½ÏòÒ»Ö±ÏòÓÒ | |
C£® | СÇòA ËùÊÜÖØÁ¦µÄ¹¦ÂÊÏÈÔö´óºó¼õС | |
D£® | СÇòA µÄ»úеÄÜÏÈÔö´óºó¼õС |
A£® | ÇúÏßÔ˶¯Ò»¶¨ÊDZäËÙÔ˶¯ | |
B£® | ÎïÌåÊܵ½±äÁ¦×÷ÓÃʱ¾Í×öÇúÏßÔ˶¯ | |
C£® | ÇúÏßÔ˶¯µÄÎïÌåÊܵ½µÄºÏÍâÁ¦¿ÉÒÔΪÁã | |
D£® | ÇúÏßÔ˶¯ÎïÌåµÄËٶȷ½Ïò±£³Ö²»±ä |