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原题如图1所示,一轻弹簧原长为2R,其一端固定在倾角为37°的固定直轨道AC的底端A处,另一端位于直轨道上B处,弹簧处于自然状态。直轨道与一半径为5/6R的光滑圆弧轨道相切于C点,AC=7R,A、B、C、D均在同一竖直平面内。质量为m的小物块P自C点由静止开始下滑,最低到达E点(未画出)。随后P沿轨道被弹回,最高点到达F点,AF=4R。已知P与直轨道间的动摩擦因数μ=1/4,重力
The original title is shown in Fig.1. The original length of a light spring is 2R, one end of which is fixed at the bottom A of the fixed straight track AC at an inclination of 37 ° and the other end is located at B of the straight track, and the spring is in a natural state. A straight orbit is tangent to a smooth circular orbit at a radius of 5 / 6R at point C, AC = 7R, with A, B, C and D all in the same vertical plane. The mass P of mass m starts to decline from rest at C and reaches the E point (not shown) as low as possible. Then P along the track was bounced back to the highest point F, AF = 4R. It is known that the dynamic friction coefficient between P and the straight track μ = 1/4, gravity