95年高考三級工程力學第三題 - 土木
By Noah
at 2013-05-04T11:11
at 2013-05-04T11:11
Table of Contents
題目：
http://farm9.staticflickr.com/8115/8704012959_8da118fa64_z.jpg
小弟的想法：
(1)第一個式子：
20*9.81*sinθ-20*9.81*cosθ*0.25-(10*9.81*sinθ-10*9.81*cosθ*0.25)=0
98.1*sinθ-24.525*cosθ=0
(2)第二個式子該怎麼列呢？
兩個未知數，需要有兩個式子才能解聯立方程式，但是第二個式子小弟實在無從下筆，麻
煩前輩不吝嗇指導，謝謝！
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Tags:
土木
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