Civil Engineering Engineering Mechanics 4 Problem 5 The uniform S0 kg plank in the igure is resting on rough surfaces A and B. The coefficients of static friction are shown in the figure. A 100 kg man starts walking from A towards B, Compute the Problem 7 Determine the smallest horizontal force P required to lift the 200-kg crate. The coefficient of static frietion at all contacting surlaces is e 030 Neglect the mass of the wedge Problem 9 Calculate the pull P that must be exerted to slowly lower the mass m-102 kg dawn the incline plane considering the following cates 45 11/8 4m turns H0.20 1. reaction at B, 2 reaction at A BIG8 A0.50 1. The friction hetween the drut and the repe is negligible while the coetficient of friction hetween the mass and the inclined surface is 025 1. distancewhen the plank will start to slide. 17E 2 The coelficient of friction at all surfaces of cuntact i 0.25 Problem 6 3. The maximum pull Prequired to startraining the mass wp the incline consie A f-m long ladder weighing 600 N is shown. It the situution of part 2 is required to deternine the hotizontal force Papplied at C to bold the ladder from siiding The coefficient of Friction hetween the ladder and the contact surfaces at A and B is 0.20. Problem 6 A tylinder having 4 mas of 250 kg is ta be suppurted by thr curd which wrapi ver the pipe Determine the largest vertical farce F that can be applied to the cord without moving the cylinder. The cord passes 45m I =e 15m 1. Determine the reaction at A 2. Determine the reaction at B. 3. Determine the required forçe P. 348.p 519.97 459.G0 1.once over the pipe 180 4 Ea7 0 2 two imem over the pipe 40The 02 1/53.21