鏈烘鎸姩濉┖
25
銆佽川閲忎负
m
鐨勮川鐐逛笌鍔插害绯绘暟涓?/p>
k
鐨勫脊绨ф瀯鎴愬脊绨ф尟瀛愶紝蹇界暐涓�鍒囬潪淇濆畧鍔涘仛鍔燂紝鍒欏叾鎸姩瑙掗鐜?/p>
飦?/p>
=_
k
m
_______.
26
銆佽川閲忎负
m
鐨勮川鐐逛笌鍔插害绯绘暟涓?/p>
k
鐨勫脊绨ф瀯鎴愬脊绨ф尟瀛愶紝蹇界暐涓�鍒囬潪淇濆畧鍔涘仛鍔燂紝鍒欐尟瀛愪綅绉讳负鎸箙
A
鐨?/p>
4/5
鏃讹紝浣撶郴鍔?/p>
鑳藉崰鎬昏兘閲忕殑
_9/25___
銆?/p>
27
銆?/p>
璐ㄩ噺涓?/p>
m
鐨勮川鐐逛笌鍔插害绯绘暟涓?/p>
k
鐨勫脊绨ф瀯鎴愬脊绨ф尟瀛愶紝
蹇界暐涓�鍒囬潪淇濆畧鍔涘仛鍔燂紝
鑻ユ尟骞呬负
A
锛?/p>
浣撶郴鐨勬�绘満姊拌兘涓?/p>
_
kA
2
/2
___
銆?/p>
28
銆佽川閲忎负
m
鐨勮川鐐逛笌鍔插害绯绘暟涓?/p>
k
鐨勫脊绨ф瀯鎴愬脊绨ф尟瀛愶紝蹇界暐涓�鍒囬潪淇濆畧鍔涘仛鍔燂紝鑻ユ尟骞呬负
A
锛屽垯鎸瓙鐩稿浜庡钩琛′綅缃?/p>
浣嶇Щ涓?/p>
A
/2
鏃讹紝鍏堕�熷害鏄渶澶ч�熷害鐨?/p>
___
3
2
_
銆?/p>
29
銆佽川閲忎负
m
鐨勮川鐐逛笌鍔插害绯绘暟涓?/p>
k
1
,
k
2
鐨勪覆鑱斿脊绨ф瀯鎴愬脊绨ф尟瀛愶紝蹇界暐涓�鍒囬潪淇濆畧鍔涘仛鍔燂紝鍒欐尟瀛愮殑鎸姩瑙掗鐜?/p>
=
1
2
1
2
(
)
k
k
m
k
k
飥?/p>
____
銆?/p>
30
銆?/p>
涓�璐ㄧ偣娌?/p>
x
杞翠綔绠�璋愭尟鍔紝鎸箙
A=0.2
锛屽懆鏈?/p>
T=7
锛?/p>
t=0
鏃讹紝浣嶇Щ
x
0
= 0.1
锛岄�熷害
v
0
>0
锛屽垯鍏剁畝璋愭尟鍔ㄦ柟绋嬭〃杈惧紡
涓?/p>
___x=0.2
2
cos(
)
7
3
t
飦?/p>
飦?
飥?/p>
__________________________________
銆?/p>
31
銆佽川閲忎负
m
鐨勮川鐐逛笌鍔插害绯绘暟涓?/p>
k
1
,
k
2
鐨勫苟鑱斿脊绨ф瀯鎴愬脊绨ф尟瀛愶紝蹇界暐涓�鍒囬潪淇濆畧鍔涘仛鍔燂紝鍒欐尟瀛愮殑鎸姩棰戠巼
飦?/p>
=___
1
2
1
2
k
k
m
飦?/p>
飥?/p>
___________
32
銆?/p>
璐ㄩ噺涓?/p>
m
鐨勮川鐐逛笌鍔插害绯绘暟涓?/p>
k
1
,
k
2
鐨勫苟鑱斿脊绨ф瀯鎴愬脊绨ф尟瀛愶紝
蹇界暐涓�鍒囬潪淇濆畧鍔涘仛鍔燂紝
鍒欐尟瀛愮殑鎸姩瑙掗鐜?/p>
飦?/p>
=____
1
2
k
k
m
飥?/p>
__________
33
銆佷袱涓悓鏂瑰悜鍚岄鐜囩殑绠�璋愭尟鍔紝鍏舵尟鍔ㄨ〃杈惧紡鍒嗗埆涓猴細
x
1
=
0.3cos(6
飦?/p>
t+
飦?/p>
/6)
锛?/p>
x
2
=0.3cos(6
飦?/p>
t-5
飦?/p>
/6)
銆傚畠浠殑鍚堟尟
鍔ㄧ殑鎸緪涓?/p>
____0________,
鍒濈浉涓?/p>
____0________
銆?/p>
鏈烘娉㈠～绌洪
34
銆佸亣瀹氫袱鍒楀钩闈㈡尝婊¤冻鍩烘湰鐨勭浉骞叉潯浠讹紝娉㈤暱
飦?/p>
= 8m
锛屾尟骞呭垎鍒负
A
1
= 0.1,
A
2
= 0.4
銆傚垯浣嶇浉宸?/p>
飦勶亞
= 2
飦?/p>
鏃?/p>
,
鍙犲姞鐐?/p>
鎸箙
A=__0.5______________;
娉㈢▼宸?/p>
飦?/p>
= 40m
鏃?/p>
,
鍙犲姞鐐规尟骞?/p>
A=_____0.5___________
銆?/p>
35
銆?/p>
鍋囧畾涓ゅ垪骞抽潰娉㈡弧瓒冲熀鏈殑鐩稿共鏉′欢锛?/p>
娉㈤暱
飦?/p>
=
1m
锛?/p>
鎸箙鍒嗗埆涓?/p>
A
1
=
0.2,
A
2
=
0.3
銆?/p>
鍒欎綅鐩稿樊
飦勶亞
=___
2
k
飦?/p>
飩?/p>
________
鏃?/p>
,
鍙犲姞鐐规尟骞?/p>
A=0.5,;
娉㈢▼宸?/p>
飦?/p>
=___k_______m
鏃?/p>
,
鍙犲姞鐐规尟骞?/p>
A=0.5,
36
銆佷竴骞抽潰绠�璋愭尝娌?/p>
Ox
杞翠紶鎾紝娉㈠姩琛ㄨ揪寮忎负
y
=
A
cos(
飦?/p>
t
-2
飦?/p>
x
/
飦?/p>
+
飦?/p>
)
锛屽垯
x
1
= L
澶勪粙璐ㄨ川鐐规尟鍔ㄧ殑鍒濈浉鏄?/p>
___
1
2
l
飦?
飦?/p>
飦?
飥?
飥?/p>
__________
锛?/p>
涓?/p>
x
1
澶勮川鐐规尟鍔ㄧ姸鎬佺浉鍚岀殑鍏跺畠璐ㄧ偣鐨勪綅缃槸
___
1
l
k
飦?/p>
飥?/p>
_____
锛?/p>
涓?/p>
x
1
澶勮川鐐归�熷害澶у皬鐩稿悓锛?
浣嗘柟鍚戠浉鍙嶇殑鍏跺畠鍚勮川鐐圭殑浣嶇疆鏄?/p>
___l+(k+1/2)
飦?/p>
__________
锛?/p>
37
銆佹満姊版尝浠庝竴绉嶄粙璐ㄨ繘鍏ュ彟涓�绉嶄粙璐紝娉㈤暱
飦?/p>
锛岄鐜?/p>
飦?/p>
锛屽懆鏈?/p>
T
鍜屾尝閫?/p>
u
璇哥墿鐞嗛噺涓彂鐢熸敼鍙樼殑涓?/p>
__
娉㈤�?/p>
u
锛屾尝闀?/p>
飦?/p>
_
锛涗繚鎸?/p>
涓嶅彉鐨勪负
_
棰戠巼
飦?/p>
锛屽懆鏈?/p>
T__
銆?/p>
38
銆佷竴绠�璋愭尝娌?/p>
x
杞存鏂瑰悜浼犳挱锛?/p>
x
1
鍜?/p>
x
2
涓ょ偣澶勭殑鎸姩閫熷害涓庢椂闂寸殑鍏崇郴鏇茬嚎鍒嗗埆濡傚浘
A.
鍜?/p>
B.
锛屽凡鐭?/p>
|
x
2
-
x
1
|<
飦?/p>
锛屽垯
x
1
鍜?/p>
x
2
涓ょ偣闂寸殑璺濈鏄?/p>
_________
锛堢敤娉㈤暱
飦?/p>
琛ㄧず锛夈�?/p>
39
銆?/p>
鍦ㄧ畝璋愭尝鐨勪竴鏉′紶鎾矾寰勪笂锛?/p>
鐩歌窛
0.2m
涓ょ偣鐨勬尟鍔ㄤ綅鐩稿樊涓?/p>
飦?/p>
/6
锛?/p>
鍙堢煡鎸姩鍛ㄦ湡涓?/p>
0.4s
锛?/p>
鍒欐尝闀夸负
____4.8m______
锛?/p>
娉㈤�熶负
_12m/s_______
銆?/p>