ÌâÄ¿ÄÚÈÝ
10£®¾²µç³¡ÓкܶàÐÔÖÊ£¬ÆäÖÐÖ®Ò»¾ÍÊǵ糡Á¦×ö¹¦Ö»ÓëµçºÉÔ˶¯µÄ³õĩλÖÃÓйأ¬ÓëÔ˶¯µÄ·¾¶Î޹أ®£¨1£©Èçͼ1Ëùʾ£¬µç×ÓÒÔ³õËÙ¶Èv0ÑØƽÐÐÓÚ°åÃæµÄ·½Ïò´ÓAµãÉäÈëƫתµç³¡£¬²¢´ÓÁíÒ»²àµÄCµãÉä³ö£®ÒÑÖªµç×ÓÖÊÁ¿Îªm£¬µçºÉÁ¿Îªe£®Æ«×ªµç³¡¿ÉÒÔ¿´×÷ÔÈÇ¿µç³¡£¬¼«°å¼äµçѹΪU£¬¼«°å³¤¶ÈΪL£¬°å¼ä¾àΪd£®ºöÂÔµç×ÓËùÊÜÖØÁ¦£¬Çóµç×Óͨ¹ýƫתµç³¡µÄ¹ý³ÌÖУ¬ÑØ´¹Ö±°åÃæ·½ÏòÆ«ÒƵľàÀëyºÍµç³¡Á¦¶Ôµç×ÓËù×öµÄ¹¦W£»
£¨2£©ÔÚÔÓе糡ÇøÓò¼ÓÒ»¸ö´¹Ö±Ö½Ãæ·½ÏòµÄÔÈÇ¿´Å³¡£¬Èçͼ2Ëùʾ£®Ê¹ÁíÒ»µç×ÓÒÔ³õËÙ¶Èv0¡äÑØƽÐÐÓÚ°åÃæµÄ·½ÏòÒ²´ÓAµãÉäÈ룬Ôڵ糡ºÍ´Å³¡µÄ¹²Í¬×÷ÓÃÏ£¬µç×Ó¾¹ýÒ»¶Î¸´Ôӵķ¾¶ºóÈÔ´ÓÁíÒ»²àµÄCµãÉä³ö£®Çó´Ë¹ý³ÌÖе糡Á¦¶Ôµç×ÓËù×öµÄ¹¦W¡äºÍµç×Ó¾¹ýCµãʱµÄËٶȴóСvc£»
£¨3£©Ä³Í¬Ñ§ÈÏΪÔÚÁ½¸ö´øµçµ¼ÌåÖ®¼ä¿ÉÒÔ´æÔÚÈçͼ3ËùʾµÄ¾²µç³¡£¬ËüµÄµç³¡ÏßÏ໥ƽÐУ¬µ«¼ä¾à²»µÈ£®ÇëÄã½áºÏ¾²µç³¡µÄ»ù±¾ÐÔÖÊ£¬ÅжÏÕâÖֵ糡ÊÇ·ñ´æÔÚ£¬²¢·ÖÎöÂÛÖ¤£®
·ÖÎö £¨1£©ÓÉÀàƽÅ×Ô˶¯¹æÂÉ´úÈ빫ʽÇó½âλÒÆ£¬ÔÙ¸ù¾Ýµç³¡Á¦×÷ÓÃÓë·¾¶Î޹أ¬Ö»ÓëÊ×ĩλÖÃÓйأ¬ÀûÓù¦µÄ¶¨Òåʽ¼´¿ÉÇó½â£»
£¨2£©Ó루1£©Ò»ÖÂÇóµÃ¹¦£¬ÔÙÓö¯Äܶ¨ÀíÇóµÃÄ©Ëٶȣ»
£¨3£©Óɲ»Í¬Â·Ïߵ糡Á¦×ö¹¦²»Ò»ÖÂÀ´·´Ö¤ÕâÖÖ¾²µç³¡²»´æÔÚ£®
½â´ð ½â£º£¨1£©µç×ÓÒÔ³õËÙ¶Èv0ÑØƽÐÐÓÚ°åÃæµÄ·½Ïò´ÓAµãÉäÈëƫתµç³¡£¬×öÀàƽÅ×Ô˶¯£»
ÔÚƽÐаåÃæ·½Ïò×öÔÈËÙÖ±ÏßÔ˶¯£¬ËùÒÔÓÐL=v0t£»
ÔÚ´¹Ö±ÓÚ°åÃæ·½Ïò×öÔȼÓËÙÖ±ÏßÔ˶¯£¬ËùÒÔÓÐ$y=\frac{1}{2}a{t}^{2}=\frac{1}{2}\frac{F}{m}{t}^{2}$=$\frac{1}{2}\frac{Ee}{m}{t}^{2}=\frac{1}{2}\frac{Ue}{md}{t}^{2}$=$\frac{1}{2}\frac{Ue{L}^{2}}{md{{v}_{0}}^{2}}$£»
µç×ÓÔڵ糡Á¦$F=\frac{Ue}{d}$×÷ÓÃÏÂÔÚF·½ÏòÉÏÔ˶¯Á˾àÀëy£¬ËùÒԵ糡Á¦¶Ôµç×ÓËù×öµÄ¹¦$W=Fy=\frac{{U}^{2}{e}^{2}{L}^{2}}{2m{d}^{2}{{v}_{0}}^{2}}$£»
£¨2£©µç³¡Á¦×ö¹¦Óë·¾¶Î޹أ¬ËùÒÔ${W}^{'}={F}^{'}y=\frac{{U}^{2}{e}^{2}{L}^{2}}{2m{d}^{2}{{v}_{0}}^{2}}$£»
ÂåÂ××ÈÁ¦´¦´¦ÓëÔ˶¯·½Ïò´¹Ö±£¬²»×ö¹¦£»ËùÒÔ£¬Ö»Óе糡Á¦×ö¹¦£¬¸ù¾Ý¶¯Äܶ¨Àí¿ÉµÃ£º${W}^{'}=\frac{1}{2}m{{v}_{c}}^{2}-\frac{1}{2}m{{v}_{0}}^{'2}$£»
ËùÒÔ£¬${v}_{c}=\sqrt{{{v}_{0}}^{'2}+\frac{{U}^{2}{e}^{2}{L}^{2}}{{m}^{2}{d}^{2}{{v}_{0}}^{2}}}$£»
£¨3£©ÕâÖֵ糡²»¿ÉÄÜ´æÔÚ£®
Èçͼ1Ëùʾ£¬Á£×ÓÑØÁ½¸ö²»Í¬µÄ·¾¶£¬´Óa¡úb£¬ºÍ´Óa¡úc¡úd¡úb£¬µç³¡Á¦×ö¹¦²»Ïàͬ£¬¼´µç³¡Á¦×ö¹¦Óë·¾¶Óйأ¬Î¥±³Á˾²µç³¡µÄ»ù±¾ÐÔÖÊ£¬ËùÒÔÕâÑùµÄµç³¡²»¿ÉÄÜ´æÔÚ£®
»ò£ºÈç¹û´æÔÚÕâÑùµÄµç³¡£¬¸ù¾ÝµÈÊÆÃæµÄÌص㣬ËüµÄµÈÊÆÃæac¡¢bdÓ¦¸ÃÈçͼ2Ëùʾ£¬a¡¢bÁ½µãµÄµçÊƲîUabÓ¦¸ÃµÈÓÚc¡¢dÁ½µãµÄµçÊƲîUcd£¬¼´Uab=Ucd£®´ÓͼÖпÉÒÔ¿´³ö£¬a¡¢bÁ½µãµÄ¾àÀëµÈÓÚc¡¢dÁ½µãµÄ¾àÀ룬ab´¦µÄ³¡Ç¿´óÓÚcd´¦µÄ³¡Ç¿£®¸ù¾ÝU=Ed£¬¿ÉµÃUab£¾Ucd£®ËùÒÔÕâÑùµÄµç³¡²»¿ÉÄÜ´æÔÚ£®
´ð£º£¨1£©µç×Óͨ¹ýƫתµç³¡µÄ¹ý³ÌÖУ¬ÑØ´¹Ö±°åÃæ·½ÏòÆ«ÒƵľàÀëyΪ $\frac{1}{2}\frac{Ue{L}^{2}}{md{{v}_{0}}^{2}}$£»µç³¡Á¦¶Ôµç×ÓËù×öµÄ¹¦WΪ$\frac{{U}^{2}{e}^{2}{L}^{2}}{2m{d}^{2}{{v}_{0}}^{2}}$£»
£¨2£©Ôڵ糡ºÍ´Å³¡µÄ¹²Í¬×÷ÓÃÏ£¬µç×Ó¾¹ýÒ»¶Î¸´Ôӵķ¾¶ºóÈÔ´ÓÁíÒ»²àµÄCµãÉä³ö£®Çó´Ë¹ý³ÌÖе糡Á¦¶Ôµç×ÓËù×öµÄ¹¦W¡äΪ$\frac{{U}^{2}{e}^{2}{L}^{2}}{2m{d}^{2}{{v}_{0}}^{2}}$£¬µç×Ó¾¹ýCµãʱµÄËÙ¶È${v}_{c}Ϊ\sqrt{{{v}_{0}}^{'2}+\frac{{U}^{2}{e}^{2}{L}^{2}}{{m}^{2}{d}^{2}{{v}_{0}}^{2}}}$£®
µãÆÀ µç³¡Á¦×ö¹¦Óë·¾¶Î޹أ¬Òò´Ë£¬³£Ñ¡ÓÃÒ»ÌõÌض¨Â·Ïߣ¬ÈçÇ°²¿·Ö²»×ö¹¦£¬ºó²¿·Öµç³¡Á¦ºã¶¨£¬¿ÉÒÔÖ±½ÓÓù¦µÄ¶¨ÒåʽÇó½âµÈ¼ò»¯¼ÆË㣻ÁíÍ⣬¶ÔÓÚ¾¹ýµç³¡¼ÓËÙ»òƫתµÄÄ©ËÙ¶ÈÎÊÌ⣬Ҳ³£Óõ糡Á¦×ö¹¦£¬È»ºóÓ¦Óö¯Äܶ¨ÀíÇó½â£®
A£® | Ô˶¯µÄÈ«¹ý³ÌСÇò»úеÄÜÊغã | |
B£® | ÏÂÂäh¸ß¶ÈʱСÇòËÙ¶È×î´ó | |
C£® | СÇòÔÚt4ʱ¿ÌËùÊܵ¯»Éµ¯Á¦´óÓÚ2mg | |
D£® | СÇòÔÚt2ʱ¿ÌÖØÁ¦ÊÆÄܺ͵¯»ÉµÄµ¯ÐÔÊÆÄÜÖ®ºÍ×îС |
A£® | GºÍG | B£® | $\frac{\sqrt{3}}{2}$GºÍ$\frac{1}{2}$G | C£® | $\frac{1}{2}$GºÍ$\frac{\sqrt{3}}{2}$G | D£® | $\frac{1}{2}$GºÍ$\frac{1}{2}$G |
A£® | Á½¸öµçÊƲ»Í¬µÄµÈÊÆÃæ¿ÉÄÜÏཻ | |
B£® | µç³¡ÏßÓëµÈÊÆÃæ´¦´¦Ï໥´¹Ö± | |
C£® | ͬһµÈÊÆÃæÉϸ÷µãµç³¡Ç¿¶ÈÒ»¶¨ÏàµÈ | |
D£® | ͬһµç³¡ÖеȲîµÈÊÆÃæÃܵĵط½µç³¡Ç¿¶È·´¶øС |
A£® | v0=$\frac{1}{sin¦È}$$\sqrt{\frac{gLcos¦È}{2}}$ | B£® | v0=$\frac{gLcos¦È}{2tan¦È}$ | C£® | v0=cos¦È$\sqrt{\frac{gL}{2sin¦È}}$ | D£® | v0=$\sqrt{\frac{gL}{2sin¦È}}$ |