[领域]静力学 [来源]课本习题 [题目] The hook wrench or pin spanner is used to turn shafts and collars.If a moment of 80 N-m is required to turn the 200mm diameter collar about the center o under the action of the applied force P,determine the contact force R on the smooth surface at A.Engagement of the pin at B may be considered to occur at the periphery of the collar. 图http://www.wretch.cc/album/album.php?id=ian60702&book=3 算了很久都解不出来，似乎是方程式不够... 烦请板上高手帮个忙...感激不尽> < -- http://www.wretch.cc/blog/ian60702 --

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