7. A rectangular block twice as high as it is wide is resting on a board. The coefficient of static friction between board and incline is 0.46. If the board's incline angle is gradually increased,
(A) the block will first tip over than slide.
(B) the block will first slide than tip over.
(C) will the block first tip over or begin sliding depends on its moment of inertia.
(D) will the block first tip over or first begin sliding depends on the coefficient of kinetic friction between board and incline.
(E) None of the above.
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統計: 尚無統計資料
統計: 尚無統計資料