A block is pressed against a vertical 2.0 m 1.5 m lying

Chapter 4, Problem 4.160

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A block is pressed against a vertical 2.0 m 1.5 m lying horizontally in a rack, as shown in the drawing. The two surfaces on which the bottle rests are 90.0 apart, and the right surface makes an angle of 45.0 with respect to the horizontal. Each surface exerts a force on the bottle that is perpendicular to the surface. Both forces have the same magnitude F. Find the value of F. 60. The drawing shows a circus clown who 90.0 2 3 1 wall by a force , as the drawing shows. This force can either push the block upward at a constant velocity or allow it to slide downward at a constant velocity. The magnitude of the force is different in the two cases, while the directional angle is the same. Kinetic friction exists between the block and the wall, and the coefficient of kinetic friction is 0.250. The weight of the block is 39.0 N, and the directional angle for the force is 30.0. Determine the magnitude of when the block slides (a) up the wall and (b) down the wall. P