发布时间 : 星期五 文章《理论力学》第七章点的合成运动习题解更新完毕开始阅读20f119f604a1b0717fd5dd23
ar(1)??50?ae?0n2sin(?2?1)??50?2??492.98(mm/s)
2zarn?
?22ae?{[30?200sin(?1)]?0.5}?(2?)2
2ae300yM?115?(2?3.14)?4535.416(mm/s) aax?0
xaay?arsin30?ae??492.98?0.5?4535.416??4781.906(mm/s)
aaz?arcos3000n2??492.98?0.5??246.49(mm/s)222
22aa?(aax)?(aay)?(aaz)2?0?(?4781.906)?(?246.49)2?4788.25(mm/s)2
??arccosaaxaaaayaa?arccos04788.25?90
0??arccos?arccos?4781.9064788.25?177.05
0??arccosaazaa?arccos?246.494788.25?92.95
0
25