Engineering
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Engineering
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- Blocks A and B weigh 50 lb and 30 lb, respectively.Using the coefficients of static friction indicated, determine the greatest weight of block D without causing motion.The uniform 20-lb ladder rests on the rough floor for which the coefficient of static friction is 0.8 and against the smooth wall at B. Determine the horizontal force P the man must exert on the ladder in order to cause it to move.Block on a rough surface weighing 400 N Angle of internal friction is 21.8⁰. Solve for the force P required to impend motion if the force is applied to block horizontally.
- A vertical rectangular gate weighs 6000 lbs and is 10 ft tall and 8 ft wide (into the paper). The gate slides in vertical slots in the side of a reservoir containing water. The coefficient of friction between the slots and the gate is 0.03. Determine the minimum vertical force required to lift the gate when the water level is 4 ft above the top edge of the gate. [Answer in units of lbs.]Determine the friction developed between the 50-kg crate and the ground if a) P = 200 N, and b) P = 400 N. The coefficients of static and kinetic friction between the crate and the ground are μs = 0.3 and μk = 0.2.A square plate having one of its side equal to 3.2 meters is immersed in water in a vertical position such that the two edges of the square would be horizontal in order that the center of pressure shall be 8cm from the center of gravity. a. How far below the water surface should the upper portion of the plate be submerged? b. What is the distance of the center of pressure from the water surface? c. Determine the hydrostatic force acting on the plate at this position.
- The three stone blocks have weights of WA = 600 lb, WB = 150 lb, and WC = 500 lb. Determine the smallest horizontal force P that must be applied to block C in order to move this block. The coefficient of static friction between the blocks is 0.3 and between the floor and each block 0.5.Determine the force P required to force the 11° wedge under the 93-kg uniform crate which rests against the small stop at A. The coefficient of friction for all surfaces is 0.46.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.
- A minimum force of P = 50 lb is required to hold the cylinder from slipping against the belt and the wall. Determine the weight of the cylinder if the coefficient of friction between the belt and cylinder is μs = 0.3 andslipping does not occur at the wall.A triangular plate with height 4 ft and a base of 6 ft is submerged vertically in water so that the top is 3 ft below the surface. Express the hydrostatic force against one side of the plate as an integral and evaluate it. (Recall that the weight density of water is 62.5 lb/ft3.)The man has a weight of 200 lb, and the coefficient of static friction between his shoes and the floor is μs = 0.5. Determine where he should position his center of gravity G at d in order to exert the maximum horizontal force on thedoor. What is this force?