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问题:一车技演员骑摩托车驶进一半径为 R,路面倾角为θ的圆锥形峭壁上做圆周运动(见图1),车轮与路面间静摩擦系数为
Question: A motor actor rides a motorcycle and enters a cone-shaped cliff with a radius R and a slope θ of the road to make a circular motion (see Figure 1). The coefficient of static friction between the wheel and the road is