Physics
Senior High
想問這題怎麼解釋答案
謝謝！
有一梯子以傾斜角(0≠0)斜靠牆上,如圖所示,若地面無摩擦,而牆與梯子間摩擦係
數為u,則
(A)0小於sin'2«時可以平衡
(B)9小於cos^2 x 時可以平衡
(C)6小於tan3 x時可以平衡
(D)無論角度如何,皆無法平衡。
答案>D
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