|
|
?????????????
??????????3-4?????????????? ??????? ?2?? ?????? ???? ??????? ???? 2012??? ? ? ? ? ?? ?
?????????????( )? ???????????????3A???????(??????)
???????? B?????(??????)
C??????? ???????????????????????????????????
????????????????????????????????????
???????????????????????
??????? ?????? ??????????????????
????????????????????? ???? ??1????????????????B????????????A( ? ? )?? ??????????????????????C???????????????? ????????D????????????????
2????????????????
?1? ?8? D??????????????3?????????????????
( )?AC??????? B???????
??????????????????
4?????????????p? p ? ????????
D????? ?30kg15kgm/s?????????????????????????????
m?s??????????????
?? ??( A5 ???)? B??? C. B??????????????A????????? D. ?? ????????[ ? ?] ? ??D????????????????C????????????????
?? 6 ?????h???v0????????m?????????????????????????t?????????????? [ ]??????????????????
7???1?????????????2? ?8?
A??????B??????C??????
D?????????
E??????????????? D????????????????
11??????????????????????? [ ]
A??????????????? ??????????? F8???????????????????
A [ ??????]
????C???????????? DB?????????????? ??? 9?A
??????????????????????????????????B????????????[ BA]
?A?B??????? B?A? ??????? C?A?B??????
DB?A?
????? ?? 10?A?B???????A???????
????????????B??????????????? ?????? A??????????????? [ ]
B??????? ???????????3? ?8? ??????? B???????????????? ???????? C???????????????? ????? D???????????????
????????????????12??????
m??????v?????????????????????t?????D?A?mv/t B?[ 2mv/t ]
C?mv/2t?????????????????130
???????????????????????????????[ ?????A ?????????]
B???????????C???????????? ???????????????????D????????????????
?????
?4? ?8?
???????????????10m/s______kg????????m/s???______???? ______?
______kg?3sm/s??????????? 15??????????????????????????????mA?2mB???????A?B??????????????A???????? ______B??????? 16??????????? ?????2m/s??????????????????????100kg/s???????? ______N2m/s????
???????????? 17?????15m????ba10m/s??????b______??a?????????????????????1sb?????????????????a?b???????a? ?????????????? 18???10N???????______?
????????????????A????2s?????37?A0.2???______N?????????????????______Ns???______NS????______????????s?????____________??????????????? ______N19???s???2????
______? ?5? ?8? ????______N______NS10ss??????
????F????????????? 20??m=3kg???????v=2m/s???O
???????
????
????????????
______??22???????????????1m/s??????????????????1kg ?????
5m????2 (g=10m/s)
????? 23???50?1??????v?????????????????m???????????t???????????????2v/3?????????
?6? ?8?
?????????24?500g????1.8m???????????????????1.25m??????1.2s?g 10m/s2????????????
?25?????m=0?2kg???????H=0?8m?????????10????????????????h=0?45m???????????????
?7? ?8? ?8? ?8?
?????????????
?????????
A???????
?????
1.?????????????m??????F??????????F???????????t????t????????????????????? ? ?
A.Ft?0?Ftsin?B.Ftcos??0?Ftsin?
C.Ft?mgt?Ftsin? D.Ft?mgt?Ftcos?
2.????????????????? ? ?
A.??????????????????????
B.????????????????????????
C.????????????????????????????????????
D.????????????????????????????????????
3.??????????????????????????????????????????????????????????????????????????? ?
A.????????????????????????????????????
B.?????????????????????????
C.??????????????????????????????
D.??????????????????????????????
4.???????????????????????????????? ?
A.?? B.??
C.????? D.??????????
5.?????????????????????????????????????????????????????????????????????????????????????????????? ?
A.?????????????????????????????
B.?????????????????????????????
C.?????????????????????????????
D.?????????????????????
6. ??????????m1?m2????????????
??, ????( )
A. ?????????????
B. ??m1????m2
C. ??????????????
D. ???????????, ????
7. ????, ???m??, ?????M?????, ????
???. ??????????????, ??????????
???()
A. ?????????????????????????
B. ??????????????, ????????????
C. ??????, ?????????, ????????????????????
D. ?????????????, ??????????
8.????????????????????, ?????????????????????????, ?????????( )
A. ?????????
B. ??????????
C. ???????????????, ?????????????
D. ???????????????
9.????????A?B??????????????A??????????????A???B??????B???A????A???????????A????? ?
A.???B.??B????
C.??B???? D.??B????
10.??????????????, ?????????????????, ?????????????????. ??????????????????????????????, ????????????????????( )
A. ????? B. ???????
C. ????? D. ?????
?????
11.?????????????????????:
(1) ?????, ????????___________?
(2) ??????____________???
(3) ???????, ???????, ????????????, ????__________________________________________?
12???????????????????????????????
? O M P N OM ? ?
(1)????????m????r1????????m2????r2?? m1m2?r1 r2 ??>?<?
=?
(2)???????????????????????????? ?
(3)?????????m1?????????m2??????????(P??????????????)??????????????????????????m1: m2 = 3:2
???????????????????p1: p2= ?
?????
13.?10?????0.4 kg??????????5m/s???????, ??4m/s??
2????????????????????0.05s???(g?1? ????????
?2? ???????????.
14.?11??????????????????????????????1?2?3?k????m1=0.1kg????3m/s????????????m2=0.2kg???????????????????????mk???????????????mk=0.3kg?k?3???
?1? ???1?2 ??????????????????
?2? ??????K???vk?
?3? ?????????????????????????????????????
m1 m2m3 ?? mk
15. ?11???????M=0.2 kg???????h=5.0 m??????.????m=0.01kg????v0=500m/s????????????,?????s=20m.??
?1? ????????
?2? ??????????
16.?13??????, ??????m=0.4 kg, ???v=20 m/s, ?????????
2?????, ?????M=1.6 kg, ??????????????=0.2. (g? 10 m/s),
?:
(1) ???????
(2) ??????????????, ?????????
(3) ???????????
B???????
??????????????????????????????????4???24???
17.?27?????????????????????40m/s???????????????????60m/s???????????????0.15kg???????????0.02s?????????????????????? ?
A.76.5NB.150.0N
C.375.0N D.750.0N
18.????????? ?
A.???????????????????????????????????????????
B.????????????????????????????????
C.???????????????????????
D.??????????????????????????????????????????
19.????????????????????1500kg????????????????????3000kg??????????????????????????????????????????????20m/s?????????????????????? ?
A.??10m/s B.??10m/s??20m/s
C.??20m/s??30m/sD. ??30m/s??40m/s
20.????????, ?????????, ??????????, ????????????, ???????????, ???????, ?()
A. ??????, ??????????
B. ??????, ??????, ??????????????
C. ??????, ??????, ??????????????
D. ???????, ???????????, ?????????.
21.???????????B????????????????A?????????????????????????????????????????????????????????????????????????????????????????? ?
A.???? B.?????
C.????????? D.?????????
22.???????????????????A?B????????????????????????????????????????A????dA????B????dB?????( )
A.??????????tA > tB B.???????EKA>EKB
C.???????vA > vBD.???? mA < mB
??????????????????????????????????7??
23. ???????????????????????????????????????????????????????????????????????????????????????????
?1???????????? ?
?2???????????
?3?????????????????? ?
????????????????????????????????????????????????????????????????????????????29??
24.?8??????0.1kg????1.25m??????????????????????????????????0.5s?????????
?1???????????
?2??????????
25.?9???????????A?B????????????????????mA?2kg?mB?0.9kg??????????????????????m c?0.1kg???C(?????)?vC?10m/s??????????A???????C????B????B?C?????v?0.5m/s,?
?1???A??????? v0
?2???C??????B????????
26.?12??????????mB=1 kg?????B????????v1=1 m?s???????????t=0????mA=2kg????A?v2=2 m?s????????????A????????????=0.2.?A????????????????? ??g?10m?s2???
(1)A??????????????????? (2)???????????
(3)????????????1.5 s???B
???????????
? ?
?????? ?? ??????????
??? ?? ??????????
A? ????
??????65=30??
1?????????? ?
A ?? B ?? C ?? D ?
2??????25kg??0.5m/s???????????20g??800m/s??????????????????????? ?
A ???? B????
C ??? D??????????????
3? ???????????????????????????????????
A ?????B ???????
C ??????? D ???
4???????????????
A ?????????????2??????????????????
B ?????????????2??????????????????
C ?????????????3???????????3??????
D ?????????????3???????????1????? 3
5???????????????????????????????????????????????????????????? ?
A ???????????
B ???????????
C ??????
D ?????????
6??2009????????????????????????????????????????
A ????
B ??????????
C ?????????????????
D ????????????????
????????2???10??
7????60kg????2m/s??????????40kg????2?5m/s????????????????????? ??????? ?
8???????????????????A??????5kg?m/s?????????B?????? ??????????????? ????A????????A??????????? ?
??????10+10=20??
9??????0.1kg????6m/s?????????????????????????6m/s???????????????????????????????????????
10????2.5?10kg????????????????????????????6
??35s???????10m/s???24m/s????????????????????????
B? ????
??????65=30??
1??2009???????????????????????????????????????????????????
A ?????????
B ??????????
C ??????????
D ??????????
2?????????????????? ?
A ??????????????????????????
B ????????????????
C ???????????????
D ??????????????
3?????????????? ?
A ??????????????
B ?????????????
C ?????????????????????
D ?????????????????????
4?????????????????????????????????????????????????????
A ?????????
B ?????????
C ???????????
D ????
5??????????????????????????????????????????????????0?2s?????????????????g?10m/s???
A 1m/s B 1.5m/s C 2m/sD 2.5m/s
6? ?????????????????F????????????????? ?
A ??????????
B ??F?????
C ?????????????
D ?????????????
????????5???10??
7?????m?5kg??????????????????v?(10?5t)m/s????????4S???????kg?m/s?
8??????????????????????9??????????????2
?? ??
??????102=20??
9??????100g???????0?8m??????????????????????????????0?2s????????????????????
10??????m?????F??????????????????????????????
?1? ????????????????????
?2? ?????????t??????t???????????????????
?3? ???????????????t?????????????????
????
A?
1?B
2?B?????p1?25?0.k5g?m/s?12k.5g???ms/????p2?20?1?30?8k0g0?ms/? 1k6g??????????ms/
3?B ?????????????????????????0????????????????????????????????????????????????????????????????????????
4?D????????????????????? A?C???B??????3????D???
5?B ?????ft??p?p2?p1?0?p1?p??t?p ?mg
6?C ??????????????????????????????????????????????????????????????????
7?1?120kg?m/s ?2?100kg?m/s
8?1?5kg?m/s?2?10kg?m/s?3? 0
9 ?? ????????????????????
p1?mv1?0.1?6kg?m/s?0.6kg?m/s
??????p2?mv2?0.1?(?6)kg?m/s??0.6kg?m/s
?????????p?p2?p1??0.6?0.6kg?m/s??1.2kg?m/s
??????????????
10 ?????????????????
I??p?p2?p1?mv2?mv1?2.5?106kg?(24?10)m/s?3.5?107kg?m/s ?????????
I?p3.5?107kg?m/s??1?106NF??tt35s
B?
1?B ????????????????????????????????????????????????????????????
2?2?A ??????????????????????????????????????????????????????????????????????????????????????
3?A ?????????????????????????????????????????????B?C?D?
4?C ????????????????????????????????????????????????????0?????????
5?C D ?????????????v1?????????0????????mgt?0?mv1
?v1?gt?10?0.2m/s?2m/s?????????????2m/s???????? ???? C D
6?B ????????????????????????????????????????????????????????????????
7?1504S????v4?(10?5?4)m/s?30m/s?????????p?mv?5kg?30m/s?150kg?m/s
8?3 ?????9????????3???????????????????3?
9??? ????????????
v8?m4 s/
??????F?t?Ft?mgt?mv???????????
Ft?mv?mgt?0.1kg?4m/s?0.1?10?0.2kg?m/s?0.6kg?m/s
10??? ?1?????????????G?mg????????F?mgsin??
?????????N?mgcos??????????
?2??????????????IG?mgt???????? ?????IF?mgtsin?,????????
??????IN?mgtcos????????????
?3????????????????????0????0
??
????
??
??
QQ
??? ????????????? 441611 bkezlhc2009@163.com 594909466
?????????????4??(???)????????
?????http://www.850500.com/news/67042.html
?????,??! |
|