The uniform pole of length L and mass M is placed against the supporting shown in Fig.3. If the coefficient of static friction on both surfaces is 4. = 0.25, maximum angle 0 at which the pole can be placed before it begins to slip. 3. surfaces as determine the [ Ans : 0 = 59.99 P(a) • 5 kg | H, = 0,50 P (b) 10 kg 105 B H, = 0.60 Fig. 3 Fig. 4

A cube with mass of m=80N is on the inclined plane with angle of phi=20 degrees. coeficient of static friction /mu_s = 0.25 coeficient of dynamic friction /mu_k = 0.15 Determine: what is the smallest size of the force F parallel to the inclined plane, which prevents the cube in the slide? what is the smallest size of the force F,  which the cube starts to move along the inclined plane up? At what value of the force F starts the cube to rise at a constant speed?

The 150 lb block rests on an inclined surfacevand is attached to a frictionless pulley C. The coefficient of static friction between the block and the incline is 0.25. The dope passes over a drum D, where the coefficient of static friction between the rope and the drum is 0.2, as shown. Find the minimum and maximum values for the weight of block B, Wb, for which no motion will occur. Neglect tipping.

The attached picture shows a scissor clamp used for gripping and moving sliding pallets.The static coefficient of friction in the jaws A and B of the clamp is 0.5. On the other hand, the static coefficient of friction between the pallet and the floor is 0.4.If the box that holds and drags the pallet has 55 kgm, what is the maximum load P to be applied to the eye at the end of the chains.Other data: a=75mm; b=20mm; c=30mm; Ө=60 deg.