ÌâÄ¿ÄÚÈÝ
20£®Ò»ÖÊÁ¿ÎªM=1.99kgµÄСÎï¿éËæ×ã¹»³¤µÄˮƽ´«ËÍ´øÒ»ÆðÔ˶¯£¬±»Ò»¸öÒÔ³õËÙ¶Èv0ˮƽÏò×ó·ÉÀ´µÄ×Óµ¯»÷ÖУ¬Éè×Óµ¯µÄÖÊÁ¿m=0.01kg£¬×Óµ¯ÉäÖÐľ¿é²¢ÁôÔÚÎï¿éÖУ¨×Óµ¯Óëľ¿éÏà¶ÔÔ˶¯µÄʱ¼ä¼«¶Ì£©£¬ÈçͼËùʾ£¬µØÃæ¹Û²ì×żÇ¼ÁËСÎï¿é±»»÷ÖкóµÄËÙ¶ÈËæʱ¼äµÄ±ä»¯¹Øϵ£¬ÈçͼËùʾ£¨Í¼ÖÐÈ¡ÏòÓÒÔ˶¯µÄ·½ÏòΪÕý·½Ïò£©£¬ÒÑÖª´«ËÍ´øµÄËٶȱ£³Ö²»±ä£¬Ç󣺣¨1£©Îï¿éÓë´«ËÍ´ø¼äµÄ¶¯Ä¦²ÁϵÊý£»
£¨2£©×Óµ¯µÄ³õËÙ¶Èv0µÄ´óС£»
£¨3£©¼ÆËãÒòÎï¿éÓë´«ËÍ´øÏà¶Ô»¬¶¯¹ý³ÌµÄĦ²ÁÉúÈÈQ£®
·ÖÎö £¨1£©¼ÆËãÎï¿éÓë´«ËÍ´øÖ®¼äµÄĦ²ÁÒòÊý£¬Ê×ÏÈ´ÓͼÏóÖÐÕÒ³öÎïÌå½öÔÚĦ²ÁÁ¦×÷ÓÃÏÂÔ˶¯Ê±¼ÓËٶȣ¬ºóÓÉÅ£¶ÙµÚ¶þ¶¨ÂÉĦ²ÁÁ¦¼´¿ÉÇó³ö ¦Ì£®
£¨2£©¸ù¾Ý¶¯Á¿Êغ㶨Âɼ´¿ÉÇó³ö×Óµ¯µÄ³õËٶȣ»
£¨3£©´Óv-tͼÏó¿´³ö£¬Îï¿é×îºóËæ´«ËÍ´øÒ»ÆðÏòÓÒ×öÔÈËÙÔ˶¯ËÙ¶ÈΪv=2.0 m/s£®ËùÒÔ£¬´«ËÍ´øµÄËٶȷ½ÏòÏòÓÒ£¬ÆäËÙ¶ÈΪv0=2.0 m/s£®
ΪÁËÇó³öÓÉÓÚĦ²Á²úÉúµÄÄÚÄÜ£¬±ØÐëµÃµ½ÓÉÓÚĦ²ÁÎïÌåÓë´«ËÍ´øÖ®¼äÏà¶ÔµÄ·³Ì£¬±¾ÌâÓ¦¸Ã·ÖÁ½¶ÎÀ´ÌÖÂÛ£¬µÚÒ»¶ÎÎïÌåÓë´«ËÍ´øÏò²»Í¬µÄ·½ÏòÔ˶¯£¬Ïà¶Ô·³ÌΪËûÃÇÏà¶ÔµØÃ淳̵ĺͣ»µÚ¶þ¶ÎÎïÌåÓë´«ËÍ´øͬÏòÔ˶¯£¬Ïà¶Ô·³ÌΪËûÃÇÏà¶ÔµØÃ淳̵IJĦ²ÁÁ¦ÓëÏà¶Ô·³ÌµÄ³Ë»ý¼´Îª²úÉúµÄÄÚÄÜ£®
½â´ð ½â£º£¨1£©ÓÉËÙ¶ÈͼÏóµÃ£¬Îï¿éÔÚ»¬¶¯Ä¦²ÁÁ¦µÄ×÷ÓÃÏÂ×öÔȱäËÙÔ˶¯µÄ¼ÓËÙ¶ÈΪ£º
$a=\frac{¡÷v}{¡÷t}=\frac{4}{2}m/{s^2}=2.0m/{s^2}$
ÓÉÅ£¶ÙµÚ¶þ¶¨Âɵû¬¶¯Ä¦²ÁÁ¦Îª£º
f=£¨M+m£©a£¬
ÆäÖУºf=¦ÌFN£¬FN=£¨M+m£©g
ËùÒÔ£ºa=¦Ìg
µÃµ½Îï¿éÓë´«ËÍ´ø¼äµÄ¶¯Ä¦²ÁÒòÊýΪ£º
$¦Ì=\frac{a}{g}=\frac{2.0}{10}=0.2$
£¨2£©´Óv-tͼÏó¿´³ö£¬Îï¿é±»»÷´©ºó×Óµ¯ÉäÎï¿éºóµÄ¹²Í¬ËÙ¶Èv=-4m/s£¬È»ºóÒ»ÆðÏÈÏò×ó¼õËÙµ½v=0£¬È»ºóÏòÓÒ¼ÓËÙµ½v=2.0 m/s£¬ÒÔºóËæ´«ËÍ´øÒ»Æð×öÔÈËÙÔ˶¯£¬ËùÒÔ´«ËÍ´øµÄËٶȷ½ÏòÏòÓÒ£¬ÆäËÙ¶ÈΪ£ºv´«=2.0 m/s£®
×Óµ¯ÓëÎï¿éÏ໥×÷ÓõĹý³ÌÖУ¬×Óµ¯ÓëÎï¿é×é³ÉµÄϵͳµÄ¶¯Á¿Êغ㣬Óɶ¯Á¿Êغ㶨ÂɵãºMv´«-mv0=£¨m+M£©v
´úÈëÊý¾ÝµÃ£ºv0=1198m/s
£¨3£©Îï¿éÏà¶Ô´«ËÍ´ø»¬¶¯µÄʱ¼ät=3sʱ¼äÄÚ´«ËÍ´øµÄλÒÆΪ£º
x1=v´«t
Îï¿éµÄλÒÆΪ£º
x2=vt+$\frac{1}{2}a{t^2}$
Îï¿éÏà¶Ô´«ËÍ´ø»¬ÐеÄ·³ÌΪ£º
sÏà¶Ô=x1-x2=9m
ËùÒÔת»¯µÄÄÚÄÜΪ£º
Q=fsÏà¶Ô
´úÈëÊý¾ÝÁªÁ¢µÃ£ºQ=36J
´ð£º£¨1£©Îï¿éÓë´«ËÍ´ø¼äµÄ¶¯Ä¦²ÁϵÊýÊÇ0.2£»
£¨2£©×Óµ¯µÄ³õËÙ¶Èv0µÄ´óСÊÇ1198m/s£»
£¨3£©¼ÆËãÒòÎï¿éÓë´«ËÍ´øÏà¶Ô»¬¶¯¹ý³ÌµÄĦ²ÁÉúÈÈÊÇ36J£®
µãÆÀ ±¾Ìâ½èÖú´«ËÍ´øÄ£ÐÍ¿¼²éÁ˹¦ÄܹØϵ£¬ÔȱäËÙÖ±ÏßÔ˶¯¹æÂÉ£¬Ä¦²ÁÒòÊý£¬Å£¶ÙµÚ¶þ¶¨ÂÉ¡¢¶¯Á¿Êغ㶨ÂɵÈ֪ʶµã£¬×ÛºÏÐÔºÜÇ¿£¬ÊÇÒ»µÀÄѶȴóµÄËüÃÇ£®½âÌâµÄ¹Ø¼üÊÇÕýÈ·ÈÏʶÔȱäËÙÖ±ÏßÔ˶¯µÄV-tͼÏó£®
A£® | Q2´øÕýµçÇÒµçºÉÁ¿Ð¡ÓÚQ1 | |
B£® | bµãµÄ³¡Ç¿Ò»¶¨ÎªÁã | |
C£® | aµãµÄµçÊƱÈbµãµÄµçÊÆµÍ | |
D£® | Á£×ÓÔÚaµãµÄµçÊÆÄܱÈbµãµÄµçÊÆÄÜ´ó |
A£® | Ë®Á÷ËÙ¶ÈÔ½´ó£¬Ë®·Ö×ÓµÄÈÈÔ˶¯Ô½¾çÁÒ | |
B£® | Ë®Äý½á³É±ùºó£¬Ë®·Ö×ÓµÄÈÈÔ˶¯Í£Ö¹ | |
C£® | Ë®µÄζÈÔ½¸ß£¬Ë®·Ö×ÓµÄÈÈÔ˶¯Ô½¾çÁÒ | |
D£® | Ë®µÄζÈÉý¸ß£¬Ã¿Ò»¸öË®·Ö×ÓµÄÔ˶¯ËÙÂʶ¼»áÔö´ó |
A£® | 2F | B£® | 0 | C£® | F | D£® | $\frac{F}{2}$ |
£¨1£©½«Ñ¡Ôñ¿ª¹ØÐýÖÁÅ·Ä·µ²¡°¡Á1¡±£¬ºì¡¢ºÚ±í±Ê¶Ì½Ó£¬ÆäÖбí±ÊaΪºì±í±Ê£¨Ìî¡°ºì±í±Ê¡±»ò¡°ºÚ±í±Ê¡±£©£¬µ÷½ÚR0£¬Ê¹Ö¸ÕëλÓÚ±íÅÌÓÒ£¨Ìî¡°×ó¡±»ò¡°ÓÒ¡±£©²àÁã¿Ì¶ÈÏß´¦£®
1 | 2 | 3 | 4 | 5 | 6 | |
R£¨¦¸£© | 100.0 | 50.0 | 25.0 | 16.7 | 12.5 | 9.1 |
$\frac{1}{R}$£¨¦¸-1£© | 0.01 | 0.02 | 0.04 | 0.06 | 0.08 | 0.11 |
U£¨V£© | 1.20 | 0.95 | 0.74 | 0.60 | 0.50 | 0.40 |
$\frac{1}{U}$£¨V-1£© | 0.83 | 1.05 | 1.35 | 1.68 | 2.00 | 2.50 |
£¨3£©¸ù¾ÝͼÏß¿ÉÖªµç¶¯ÊÆE=1.43V£¬ÄÚ×èr=23.0¦¸£®£¨½á¹û±£Áô3λÓÐЧÊý×Ö£©
A£® | aºÍbµÄÏòÐļÓËٶȶ¼µÈÓÚÖØÁ¦¼ÓËÙ¶Èg | |
B£® | aµÄ½ÇËÙ¶È×î´ó | |
C£® | c¾àÀëµØÃæµÄ¸ß¶È²»ÊÇһȷ¶¨Öµ | |
D£® | dÊÇÈý¿ÅÎÀÐÇÖж¯ÄÜ×îС£¬»úеÄÜ×î´óµÄ |
A£® | ½«A°åÏòÉÏƽÒÆ-Щ£¬ÒºµÎ½«ÏòÏÂÔ˶¯ | |
B£® | ½«A°åÏò×óƽÒÆһЩ£¬ÒºµÎ½«ÏòÉÏÔ˶¯ | |
C£® | ¶Ï¿ªµç¼üS£¬½«A°åÏòÏÂƽÒÆһЩ£¬ÒºµÎÈÔ±£³Ö¾²Ö¹ | |
D£® | ¶Ï¿ªµç¼üS£¬½«A°åÏòÓÒƽÒÆһЩ£¬ÒºµÎÈÔ±£³Ö¾²Ö¹ |