For the block system in figure below. Determine the smallest force P that impending motion. The block weights (A = 40 Kg, B = 50 Kg, C = 4O Kg and D = 3O Kg). The coefficients of static friction at all ground surfaces is us = 0.3 and between block C and D is us = 0.25 (neglect the friction on the pulleys)

Dont forget to draw the FREE BODY DIAGRAMS ALSO PLEASE! (:

A uniform ladder of length 12 mand mass 30 kg rests with one ed on rough horizontal ground and the other end against a smooth vertical wall. The ladder is indined 65°. The coefficient of friction, H, between the ladder and the ground is 0.35. A woman of mass 65 kg is slowly dimbing up the ladder. She wants to know how far up the ladder she can dimb safely. Drawa diagramshowing all the force adting on the ladder when the woman is x metres fromthe foot of the ladder. (a) (b) Find the reaction of the ground on the ladder. (c) Show that the reaction of the wall on the ladder is less than 33.25g By taking moments about the base of the ladder, find how far up th ladder she an dimb safely. (d)

A uniform ladder 5 m long and weighing 80N rests against on a vertical wall at B and one end at A (on the ground). The angle of friction at all contact surfaces is 21.8°. Find the smallest angle 0 at which the ladder can be inclined with the horizontal before it is on its verge of slipping.