A block rests on a rough plane inclined at to the horizontal

PHYSICS · Single correct · ISC · Physics · Laws of Motion · Laws of Motion

Problem

A 3.0 kg3.0\,\text{kg} block rests on a rough plane inclined at 25∘25^\circ to the horizontal. A horizontal force of 20 N20\,\text{N} is applied to the block towards the plane so that it has a component acting up the slope. If the block is just about to slide up the plane, find the coefficient of static friction between the block and the plane. (Take g=9.8 m s−2g = 9.8\,\text{m s}^{-2}.) (a) 0.320.32 (b) 0.280.28 (c) 0.160.16 (d) 0.470.47

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