Consider the system of weights `P_(1)=1 kg,P_(2) = 2 kg,P_(3) = 5kg and P_(4) = 0.5 kg` as shown in Figure 7.14. `alpha = 30^(@), g = 9.8 ms^(-2)` and the coefficient of friction between the weights and the planes is 0.2 Find (a) the acceleration of the system (b) tensions in the strings between `P_(1) and P_(2)` and that between `P_(2) and P_(2)` respectively and (c) the force with which `P_(4)` presses down on `P_(3)`

[Hint : Make free-body diagrams and apply Newton's law of motion after resolving the forces acting on a body along and perpendicular to the plane on which it lies]

Answer

`6.87 ms^(-2)` (b) `8.83 N,16.12 N` (c) 1.465 N