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发表于 2019-9-13 23:46:11 | 显示全部楼层 |阅读模式
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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

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????

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______??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?

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A???????

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1.?????????????m??????F??????????F???????????t????t????????????????????? ? ?

A.Ft?0?Ftsin?B.Ftcos??0?Ftsin?

C.Ft?mgt?Ftsin? D.Ft?mgt?Ftcos?

2.????????????????? ? ?

A.??????????????????????

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C.????????????????????????????????????

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A.?????????????????????????????

B.?????????????????????????????

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6. ??????????m1?m2????????????

??, ????( )

A. ?????????????

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C. ??????????????

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7. ????, ???m??, ?????M?????, ????

???. ??????????????, ??????????

???()

A. ?????????????????????????

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D. ???????????????

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A.???B.??B????

C.??B???? D.??B????

10.??????????????, ?????????????????, ?????????????????. ??????????????????????????????, ????????????????????( )

A. ????? B. ???????

C. ????? D. ?????

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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= ?

?????

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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, ?????????

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?:

(1) ???????

(2) ??????????????, ?????????

(3) ???????????

B???????

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17.?27?????????????????????40m/s???????????????????60m/s???????????????0.15kg???????????0.02s?????????????????????? ?

A.76.5NB.150.0N

C.375.0N D.750.0N

18.????????? ?

A.???????????????????????????????????????????

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19.????????????????????1500kg????????????????????3000kg??????????????????????????????????????????????20m/s?????????????????????? ?

A.??10m/s B.??10m/s??20m/s

C.??20m/s??30m/sD. ??30m/s??40m/s

20.????????, ?????????, ??????????, ????????????, ???????????, ???????, ?()

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23. ???????????????????????????????????????????????????????????????????????????????????????????

?1???????????? ?

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24.?8??????0.1kg????1.25m??????????????????????????????????0.5s?????????

?1???????????

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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

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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)???????????

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A ?? B ?? C ?? D ?

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A ???? B????

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7????60kg????2m/s??????????40kg????2?5m/s????????????????????? ??????? ?

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9??????0.1kg????6m/s?????????????????????????6m/s???????????????????????????????????????

10????2.5?10kg????????????????????????????6

??35s???????10m/s???24m/s????????????????????????

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1??2009???????????????????????????????????????????????????

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A 1m/s B 1.5m/s C 2m/sD 2.5m/s

6? ?????????????????F????????????????? ?

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8??????????????????????9??????????????2

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9??????100g???????0?8m??????????????????????????????0?2s????????????????????

10??????m?????F??????????????????????????????

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????

A?

1?B

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3?B ?????????????????????????0????????????????????????????????????????????????????????????????????????

4?D????????????????????? A?C???B??????3????D???

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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?????????

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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

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QQ

??? ????????????? 441611 bkezlhc2009@163.com 594909466


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