Question 4 Determine the maximum force P that can be applied without causing the two 50-kg crates to move. The coefficient of static friction between each crate and the ground is us = 0.25. A B 30° Ans: 247 N
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- A block weighing 100 N is placed on an inclined plane of slope angle 30 degrees and is connected to a secondhanging block of weight “W”, by a cord passing over a small frictionless pulley. The coefficient of slidingfriction is 0.3. Find the weight “W” for which the 100N block moves up the inclined plane at a constantvelocity.Determine the maximum force P that can be applied without causing the two 50-kg crates to move. The coefficient of static friction between each crate and the ground is μs = 0.25.: Block B has a mass m and is released from rest when it is on top of cart A, which has a mass of 3kg. Determine the tension in cord CD needed to hold the cart from moving while B slides down A. Neglect friction. =30o
- If blocks A and B has the total mass of 250 grams with a ratio (A:B) of 2:3, what will be the smallest force F needed to cause motion of block B if P=300 N? Let the static friction of the surfaces between A & B and B & C will be 0.25 and the surfaces between the ropes and pegs D & E be 0.35.The 100-lb boy at A is suspended from the cable that passes over the quarter circular cliff rock. What horizontal force must the woman at A exert on the cable in order to let the boy descend at constant velocity? The coefficients of static and kinetic friction between the cable and the rock are μs = 0.4 and μk = 0.35, respectively.Note : point load = 12.289KN/m *3 = 36.867KN . 1) calculate the reaction forces 2) Calculate and draw the Bending moment digram, and what is the value of maximium bending moment ? 3) calculate and draw the shear force digram and what is the value of the maximum shear force ?
- The cylinder of weight, W, shown below is being hoisted up with the force F against the vertical wall. If us = 0.57 a. Determine the reaction force (resultant of normal force and frictional force) against the vertical wall. b. Calculate the force, F, needed to set the cylindrical roller in motion W or W1 (in kN) = 516A block weighing 100Nis held on a 40 ̊incline by a bar attached to a 150N block on a horizontal plane. The bar, which is fastened by smooth pins at each end, is inclined 20 ̊above the horizontal. The angle of friction between each block and its plane is 18 ̊. Fin the horizontal force P applied to the 150N block which will cause to be on the point of moving (a) to the right; (b) to the left.A stepladder consisting of two legs pinned together at C is resting on a rough floor. Will a 800 N worker be able to change the light bulb if he is required to climb to a height of 1.3 m? The uniform legs AC and BC weigh 110 N and 70 N, respectively. The coefficient of static friction at Aand B is 0.48.
- .Determine the minimum force P that will cause impending motion of the block shown in Figure P7–12. Will the block tip or slide? (If tipping occurs about point A, both the normal force N and the friction force F will be acting through point A.)F8-3. Determine the maximum force P that can be applied without causing the two 50-kg crates to move. The coefficient of static friction between each crate and the ground is pe = 0.25.The ladder and the person weigh 30 lb and 180 lb, respectively. The center ofmass of the 12-ft ladder is at its midpoint. The coefficient of static frictionbetween the ladder and the floor is 0.5 and the coefficient of friction betweenthe ladder and the wall is 0.3. What is the largest value of the angle ALPHA for which the person could climb to the top of the ladder without it slipping?