ÌâÄ¿ÄÚÈÝ

ÔÚ¡°ÑéÖ¤»úеÄÜÊغ㶨ÂÉ¡±µÄÒ»´ÎʵÑéÖУ¬ÖÊÁ¿m=1kgµÄÖØÎï×ÔÓÉÏÂÂ䣬ÔÚÖ½´øÉÏ´ò³öÎåϵÁеĵ㣬ÈçÉÏͼËùʾ£¨ÏàÁÚ¼ÇÊýµãʱ¼ä¼ä¸ôΪ0.02s£©£º£¨gÈ¡9.8m/s2£¬½á¹û±£Áô¶þλÓÐЧÊý×Ö£©
£¨1£©Ö½´øµÄ
P
P
£¨ÓÃ×Öĸ±íʾ£©¶ËÓëÖØÎïÏàÁ¬£»
£¨2£©´òµã¼ÆʱÆ÷´òϼÆÊýµãBʱ£¬ÎïÌåµÄËÙ¶ÈvB=
0.98
0.98
m/s£»
£¨3£©´ÓÆðµãPµ½´òϼÆÊýµãBµÄ¹ý³ÌÖÐÎïÌåµÄÖØÁ¦ÊÆÄܼõÉÙÁ¿¡÷EP=
0.49
0.49
J£¬´Ë¹ý³ÌÖÐÎïÌ嶯ÄÜÔö¼ÓÁ¿¡÷Ek=
0.48
0.48
J£»
£¨4£©ÒÔhΪºáÖᣬv2/2Ϊ×ÝÖá»­v2/2-hͼÏóΪ¹ýÔ­µãµÄÒ»ÌõÖ±Ïߣ¬ÆäбÂÊΪ
ÖØÁ¦¼ÓËÙ¶È
ÖØÁ¦¼ÓËÙ¶È
£®
£¨5£©Ò»°ã¼ÆËãÖС÷EkСÓÚ¡÷EP£¬Ô­ÒòÊÇÖØÎïÔÚϽµ¹ý³ÌÖÐÊܵ½¿ÕÆø×èÁ¦ºÍ
Ö½´ø¸úÏÞλ¿×¼äµÄĦ²Á×èÁ¦
Ö½´ø¸úÏÞλ¿×¼äµÄĦ²Á×èÁ¦
£®
·ÖÎö£º£¨1£©ÎïÌåÏÂÂ䣬ÔÚÏàµÈʱ¼äÄÚµÄλÒÆÔ½À´Ô½´ó£¬¸ù¾Ý¸Ã¹æÂÉÅжÏÖ½´øµÄÄÄÒ»¶ËÓëÖØÎïÏàÁ¬£»
£¨2£©ÀûÓÃÔÚÔȱäËÙÖ±ÏßÔ˶¯ÖУ¬Öмäʱ¿ÌµÄ˲ʱËٶȵÈÓڸùý³ÌÖеÄƽ¾ùËÙ¶ÈÀ´ÇóBµÄËٶȴóС£»
£¨3£©È»ºó¸ù¾Ý¶¯ÄÜ¡¢ÊÆÄܶ¨Òå½øÒ»²½ÇóµÃ¶¯ÄܺÍÊÆÄܵı仯Çé¿ö£»
£¨4£©¸ù¾Ý»úеÄÜÊغãµÄ±í´ïʽ£¬Çó³ö
v2
2
ÓëhµÄº¯Êý¹Øϵ£¬È»ºó¸ù¾Ý¹«Ê½ÕÒ³öбÂʵÄÒâÒå½øÐзÖÎö£®
½â´ð£º½â£º£¨1£©ÎïÌå×ö¼ÓËÙÔ˶¯£¬Òò´Ëµã¾àÔ½À´Ô½´ó£¬¹ÊÖ½´øµÄP¶ËÓëÖØÎïÏàÁ¬£®
¹Ê´ð°¸Îª£ºP£®
£¨2£©Öмäʱ¿ÌµÄ˲ʱËٶȵÈÓڸùý³ÌÖеÄƽ¾ùËÙ¶ÈÀ´ÇóBµÄËٶȴóС£º
vB=
xAC
2T
=0.98m/s

¹Ê´ð°¸Îª£º0.98£®
£¨3£©Oµ½´òϼÆÊýµãBµÄ¹ý³ÌÖÐÖØÁ¦ÊÆÄܼõÉÙÁ¿ÊÇ£º¡÷EP=mghOB=0.49J£»
Òò´Ë¶¯ÄܵÄÔöÁ¿Îª£º¡÷EK=
1
2
m
v
2
B
=0.48J

¹Ê´ð°¸Îª£º0.49£¬0.48£®
£¨4£©¸ù¾Ýmgh=
1
2
mv2
µÃ£º
v2
2
=gh
£¬Òò´ËÔÚ
v2
2
ÓëhµÄͼÏßΪ¹ýÔ­µãµÄÖ±Ïߣ¬Ð±ÂʱíʾÖØÁ¦¼ÓËٶȵĴóС£¬ÓÉÓÚÎïÌåÏÂÂäµÄ¹ý³ÌÖв»¿É±ÜÃâµÄÊܵ½×èÁ¦×÷Óã¬Òò´Ë¶¯ÄܵÄÔö¼ÓÁ¿Ð¡ÓÚÊÆÄܵļõСÁ¿£®
¹Ê´ð°¸Îª£ºÖØÁ¦¼ÓËٶȣ¬Ö½´ø¸úÏÞλ¿×¼äµÄĦ²Á×èÁ¦£®
µãÆÀ£ºÕýÈ·½â´ðʵÑéÎÊÌâµÄÇ°ÌáÊÇÃ÷ȷʵÑéÔ­Àí£¬´ÓʵÑéÔ­Àí³ö·¢½øÐзÖÎöËùÐèʵÑéÆ÷²Ä¡¢ÊµÑé²½Öè¡¢Ëù²âÊý¾Ý£¬Í¬Ê±ÒªÊìÁ·ÔËÓÃÔȱäËÙÖ±ÏßÔ˶¯µÄ¹æÂɽâ´ðʵÑéÎÊÌ⣮
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿
£¨1£©ÏÖÐиßÖÐÎïÀí½Ì²ÄµÄѧÉúʵÑéÖУ¬ÌṩÁËÖØ´¸ÏßµÄÊÇ
AC
AC

A¡¢Ñо¿Æ½Å×ÎïÌåµÄÔ˶¯    B¡¢ÑéÖ¤»úеÄÜÊغ㶨ÂÉ
C¡¢ÑéÖ¤¶¯Á¿Êغ㶨        D¡¢Óõ¥°Ú²â¶¨ÖØÁ¦¼ÓËÙ¶È
£¨2£©ÔÚÀûÓÃ×ÔÓÉÂäÌåÔ˶¯ÑéÖ¤»úеÄÜÊغ㶨ÂɵÄʵÑéÖУºÈô´òµã¼ÆʱÆ÷Ëù½Ó½»Á÷µçµÄƵÂÊΪ50ºÕ×È£¬¼×¡¢ÒÒÁ½ÌõʵÑéÖ½´ø£¬Èçͼ1Ëùʾ£¬Ó¦Ñ¡
¼×
¼×
Ö½´øºÃ£®ÈôÒѲâµÃµã2µ½4¼ä¾àÀëΪs1£¬µã0µ½3¼ä¾àÀëΪs2£¬´òµãÖÜÆÚΪT£¬ÑéÖ¤ÖØÎ↑ʼÏÂÂäµ½´òµã¼ÆʱÆ÷´òϵã3Õâ¶Îʱ¼äÄÚ»úеÄÜÊغ㣬s1¡¢s2ºÍTÓ¦Âú×ãµÄ¹ØϵΪT=
S1
2
2gS2
S1
2
2gS2
£®

£¨3£©Ó°ÏìÎïÖʲÄÁϵç×èÂʵÄÒòËغ࣮ܶһ°ã½ðÊô²ÄÁϵĵç×èÂÊËæζȵÄÉý¸ßÔö´ó£¬¶ø°ëµ¼Ìå²ÄÁϵĵç×èÂÊÔòËæζȵÄÉý¸ß¶ø¼õС£®Ä³Ð£Ñо¿ÐÔѧϰС×éΪÁËÑо¿Ä³ÖÖµ¼µç²ÄÁϵĵ¼µçÌØÐÔ£¬ËûÃÇÓøÃÖÖ²ÄÁÏÖÆ×÷³Éµç×èÖµ½ÏСµÄÏß×´Ôª¼þz×öʵÑ飬ËùÓõçѹ±íµÄÁ¿³ÌΪ3V£¬µçÁ÷±íµÄÁ¿³ÌΪ3A£¬²âµÃÔª¼þZÖеĵçÁ÷ÓëÏàÓ¦µçѹµÄ9×éÊý¾Ý±êÔÚI-UͼÉÏ£®
¢ÙËûÃǽøÐÐʵÑéӦѡÓõÄʵÎïµç·ͼÊÇͼ2ÖеÄ
C
C
£®

¢ÚÔÚ½»Á÷ÆÀ¼Û¹ý³ÌÖÐijͬѧÌá³ö£¬ÓÐ2×éʵÑéÊý¾Ý´æÔÚÃ÷ÏԵĴíÎó£¬ÄãÈÏΪÊÇ
C¡¢D
C¡¢D
£¨Ö»ÐèÌîÉÏÓë¸ÃÊý¾Ý¶ÔÓ¦µÄµãO¡¢A¡¢B¡­£©
¢ÛÇëÔÚͼ3ÉÏ»­³öÔª¼þZµÄ·ü°²ÌØÐÔÇúÏߣ¬ÅжÏÔª¼þZÊÇ
°ëµ¼Ìå
°ëµ¼Ìå
²ÄÁÏ£¨¡°½ðÊô¡±»ò¡°°ëµ¼Ì塱£©£®
£¨2010?³É¶¼¶þÄ££©£¨1£©ÔÚÑéÖ¤¡°»úеÄÜÊغ㶨ÂÊ¡±µÄÊÔÑéÖУº
¢ÙÏÂÃæÐðÊöÕýÈ·µÄÊÇ
AB
AB
£¨ÌîÐòºÅ×Öĸ£©
A£®Ñ¡ÓõÄÖØÎïµÄÌå»ýÓ¦µ±Ð¡Ò»Ð©
B£®²Ù×÷ʱӦÏÈͨµçÔÙÊÍ·ÅÖ½´ø
C£®Ó¦¸ÃÑ¡Óõ㼣ÇåÎú£¬ÇÒµÚÒ»¡¢¶þÁ½µã¼äµÄ¾àÀë½Ó½ü2mmµÄÖ½´ø½øÐзÖÎö
D£®µç´Å´òµã¼ÆʱÆ÷¶¼Ó¦½ÓÔÚµçѹΪ20VµÄ½»Á÷µçÔ´ÉÏ
¢ÚʵÑéÊÒÓÐÏÂÁÐÆ÷²Ä¿É¹©Ñ¡ÓãºÌú¼Ų̈£¬µç´Å´òµã¼ÆʱÆ÷£¨°üÀ¨¸´Ð´Ö½£©£¬Ö½´ø£¬Í£±í£¬µÍѹ½»Á÷µçÔ´£¨´ø¿ª¹Ø£©£¬µ¼Ïߣ¬Ììƽ£¬¿Ì¶È³ß£®
ÆäÖв»±ØÒªµÄÆ÷²ÄÓÐ
Í£±í£¬Ììƽ
Í£±í£¬Ììƽ
£»È±ÉÙµÄÆ÷²ÄÊÇ
ÖØÎï
ÖØÎï
£®
£¨2£©Ä³Í¬Ñ§Ïë²âij¸öµç×èµÄµç×èÖµRx£¨Ô¼Îª130¦¸£©£¬Îª´ËËûÕÒÀ´ÏÂÁÐÆ÷²Ä£º
A£®µçÁ÷E£ºµç¶¯ÊÆԼΪ1.5V£¬ÄÚ×è¿ÉºöÂÔ²»¼Æ
B£®µçÁ÷±íA1£ºÁ¿³ÌΪ0¡«10mA£¬ÄÚµç×èr1=10¦¸
C£®µçÁ÷±íA2£ºÁ¿³ÌΪ0¡«20mAµç×èr2ԼΪ5¦¸
D£®¶¨Öµµç×èR0£º×èÖµR0=90¦¸
E£®»¬¶¯±ä×èÆ÷R1£º×î´ó×èֵΪ20¦¸
F£®»¬¶¯±ä×èÆ÷R2£º×î´ó×èֵΪ1000¦¸
G£®µ¥µ¶µ¥ÖÀ¿ª¹ØS£¬µ¼ÏßÈô¸É
¢Ù¸ÃͬѧµÄÉè¼Æ˼·ÊÇ£ºÏȽ«ÆäÖÐÒ»Ö»µçÁ÷±í¸Ä×°³Éµçѹ±í£¬È»ºóÀûÓ÷ü°²·¨²â³öRx£®ÎªÁ˾¡Á¿×¼È·µÄ²â³öRxµÄ×èÖµ£¬ÇëÄã¸ù¾ÝÕÒµ½µÄÆ÷²ÄºÍ¸ÃͬѧµÄÉè¼Æ˼·£¬ÔÚÐéÏß¿òÄÚ»­³öʵÑéµç·ͼ£¬²¢±ê³öÆ÷²Ä·ûºÅ£®
¢ÚÄãËùÑ¡ÓõĻ¬¶¯±ä×èÆ÷ÊÇ
R1
R1
£¨ÌîÆ÷²ÄÐòºÅ×Öĸ»òÆ÷²Ä·ûºÅ£©£®
¢ÛÈôij´Î²âÁ¿ÖеçÁ÷±íA1µÄʾÊýΪI1£¬µçÁ÷±íA2µÄʾÊýΪI2£¬ÔòRxµÄ±í´ïʽΪ£ºRx=
I1(R0+r1)
I2-I1
I1(R0+r1)
I2-I1
£®

Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com

¾«Ó¢¼Ò½ÌÍø