A uniform ladder ABABAB, with length 4 m and mass 12 kg, rests with its end A A\,A on rough horizontal ground. The ladder is in limiting equilibrium against a fixed smooth horizontal rail at a point CCC, where AC=3AC = 3AC=3 m. The ladder is in a vertical plane perpendicular to the rail and is inclined to the horizontal at an angle α\alphaα, where tanα=4/3\tan \alpha = 4/3tanα=4/3. The coefficient of friction between the ladder and the ground is μ\muμ.
Using the model, find the value of μ\muμ.
130 exam-style questions on Edexcel A Level Maths Applications of Forces, covering 7.1 Static Particles, 7.2 Modelling with Statics, 7.3 Friction and Static Particles, 7.4 Static Rigid Bodies, 7.5 Dynamics and Inclined Planes, and 7.6 Connected Particles 2. Each one has a worked solution and a mark scheme showing where the marks go.