- 1 -
绗?/p>
21
灞婂叏鍥戒腑瀛︾敓鐗╃悊绔炶禌鍐宠禌璇曞嵎
涓�銆侊紙
20
鍒嗭級鏈変竴鍏夊厜瀵肩氦缁达紝鍏夎姱鎶樺皠鐜?/p>
n=1.500
鐨勯�忔槑搴︽瀬濂界殑浠嬭川锛屽叾鎴潰鍗婂緞
涓?/p>
r
锛涘厜鑺闈㈠寘灞傜殑鎶樺皠鐜?/p>
n =1.400
銆傛湁涓�鍗婂浣撴縺鍏夊櫒
S
锛屼綅浜庡厜绾よ酱绾跨殑寤堕暱涓婏紝鍙?
鍑哄崐瑙掑涓?/p>
30
o
鐨勫厜鏉熴�備负渚夸簬浣挎鍏夋潫鍏ㄩ儴杩涘叆鍏夌氦锛屽湪鍏夌氦绔潰澶勭儳缁撲簡涓�涓叾鏉愭枡涓庡厜
鑺浉鍚岀殑銆佸崐寰勪负
R
鐨勭悆鍐?/p>
QAQ
锛囷紝绔潰闄勮繎鐨勭粨鏋勫鍥炬墍绀猴紙鍖呭眰鏈敾鍑猴級锛?/p>
S
鍙湅浣滅偣
鍏夋簮锛屽厜绾ゆ斁鍦ㄧ┖姘斾腑锛岀┖姘旂殑鎶樺皠鐜?/p>
n
0
鎸?/p>
1.000
璁＄畻銆?/p>
1
銆佽嫢瑕佸崐瀵间綋婵�鍏夊櫒鍙戝嚭鐨勫厜鑳藉鍏ㄩ儴灏勫埌鐞冨啝涓婏紝鍒欏厜婧?/p>
S
绂?/p>
A
鐨勮窛绂?/p>
x
搴旀弧瓒?/p>
浠�涔堟潯浠讹紵
2
銆佸鏋?/p>
R=1.8r,
鍏夋簮
S
涓?/p>
A
鐨勮窛绂讳负
R
锛屽叆灏勪笌杞寸殑澶硅鐢?/p>
伪
琛ㄧず锛屽垯
伪
瑙掑垎鍒负
伪
1
=30
o
銆?/p>
伪
2
=25
o
鍜?/p>
伪
3
锛?/p>
20
o
鐨勪笁鏍瑰厜绾胯兘鍚︾粡杩囧叏鍙嶅皠鍦ㄥ厜绾や腑浼犳挱锛?/p>
浜屻�侊紙
20
鍒嗭級璇曚粠鐩稿璁鸿兘閲忓拰鍔ㄩ噺鐨勮搴﹀垎鏋愯璇?/p>
1
銆佷竴涓厜瀛愪笌鐪熺┖涓浜庨潤姝㈢姸鎬佺殑鑷敱鐢靛瓙纰扮鎾炴椂锛屽厜瀛愮殑鑳介噺涓嶅彲鑳藉畬鍏ㄨ鐢靛瓙
鍚告敹銆傚厜瀛愬皠鍒伴噾灞炶〃闈㈡椂锛屽叾鑳介噺鏈夊彲鑳藉畬鍏ㄨ鍚告敹琚娇鐢靛瓙閫稿嚭閲戝睘琛ㄩ潰锛屼骇鐢熷厜鐢垫晥
搴斻�?/p>
涓夈�侊紙
25
锛夊鍥炬墍绀猴紝涓�璐ㄩ噺
M=30.0Kg
鐨勬褰㈡湪鍧?/p>
OABC
闈欐鍦ㄦ按骞冲湴闈笂锛屽叾鏂滈潰娈?/p>
AB
鐨勫�捐锛?/p>
BC
娈电殑鍊捐
伪
=45
o
锛?/p>
AB
娈典笌
BC
娈佃繛鎺ュ锛?/p>
B
锛変负涓�闈炲父鐭殑鍏夋粦鍦嗗姬锛岀幇
灏嗕竴璐ㄩ噺鐨?/p>
m=4.00Kg
灏忕墿鍧楋紙鍙涓鸿川鐐癸級锛屾斁鍦ㄦ枩闈笂绂诲湴闈㈤珮
h
1
=2.80m
鐨?/p>
A
澶勶紝鐒?/p>
鍚庢斁鎵嬶紝浠ゅ皬鐗╁潡浠庨潤姝㈠紑濮嬫枩闈笅婊戯紝宸茬煡灏忕墿鍧椾笌鏂滈潰涔嬮棿鏃犳懇鎿︼紝鏈ㄥ潡涓庡湴闈㈤棿鐨勬渶
澶ч潤鎽╂摝绯绘暟鍜屾粦鍔ㄦ懇鎿︾郴鏁颁负
渭
=6.00*10
-2
锛?/p>
B
澶勭妗岄潰鐨勯珮搴?/p>
h
2
=2.00m
锛屽鏋滀笉璁″皬鐗?
鍧楃粡杩囧
B
鏃?/p>
(
尾
=60
o
)
鐗╁潡鍙婃湪鍧楅�熷害澶у皬鐨勬敼鍙橈紝姹傚皬鐗╁潡浠庢枩闈笂
A
澶勬粦鍔ㄥ埌鏂滈潰搴?
閮?/p>
C
澶勬暣涓繃绋嬩腑灏忕墿鍧楀鏈ㄥ潡鎵�鍋氱殑鍔燂紙鍙栭噸鍔涘姞閫熷害
g=10.0ms
-2
锛?/p>