The tongs are used to lift the 150-kg crate, whose center of mass is at G. Determine the least coefficient of static friction at the pivot blocks so that the crate can be lifted, then discuss your results.
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- Q2: - The ladder and the person weigh 30 lb and 180 lb, respectively. The center of mass of the 12-ft ladder is at its midpoint. The angle Assume that the wall is smooth on the ladder. (a) If what is the magnitude of the friction force exerted on the ladder by the floor as shown in fig 2? (b) What minimum coefficient of static friction between the ladder and the floor is necessary for the person to be able to climb to the top of the ladder without slipping? 160 mm 20 ft/s 140 mm 200 40 mm mm 10 | 40 mm 120 mm Fig 1 Fig 2 Fig 3A 100-lb force acts as shown on a 300-lb crate placed on an inclined plane. The coefficients of friction between the crate and the plane are u. = 0.25 and Hk = 0.20. 300 lb Determine whether the crate is in equilibrium, and find the value of the friction force. 100 Ib 41. Two blocks are connected by a rope attached to each block with frictionless pulley as shown. If the coefficient of friction under each block is 0.25 and B weighs 25 kN, find the minimum mass of A to prevent motion. Assume B = 55° and 0 = 35o %3D B A
- 2. The 100 – Ib force acts as shown on a 300 - Ib block placed on an inclined plane. The coefficients of friction between the block and the plane are us = 0.25 and Hk = 0.20. Determine whether the block is in equilibrium, and find the value of the friction for the friction force. 300 Ib 100 lbA 250 lb refrigerator is being pushed. You do not know what force P should be applied. The coefficient of static friction between the refrigerator and floor is lg = 0.4. The center of gravity of the refrigerator is at point G. - d2 -- d2 F1 d3 d1 d4 Values for the figure are given in the following table. Note the figure may not be to scale. Variable Value di 4.5 ft d2 1.5 ft d3 2.5 d4 3.5 a. Determine the force P that is needed to overcome friction. b. Determine the location of the normal force r measured from the center of the refrigerator if the force P from part a is applied. c. Determine the minimum force P that is required to tip the refrigerator. d. Will the refrigerator slip or tip first? Round your final answers to 3 significant digits/figures. P= lb ft Pip = lb Will the refrigerator slip or tip first? tip O slipIn a hydraulic press, the small cylinder has a diamter of 1 in, while the large piston has a diameter of 8 in. If a force of 120 lbs is applied to the small piston, what is the force on the large piston, neglecting friction.
- The coefficient of friction between the inner pulley and the belt is 1/π. Find the maximum value of W that can be supported without rotating the compound pulley P or slipping the belt on the compound pulley P. Pulley B is frictionless. A 200 lb A WA 140-kg block is resting on a 51 deg inclined plane with a coefficient of friction = 0.62.Find the required horizontal force P (kN) that is necessary to prevent motion DOWN the incline. Round off to two decimal placesPls answer asap. Badly need it. Three identical blocks are placed on top of each other on a horizontal plane. Each block has a weight of 110 lb and the coefficient of friction between all surfaces is 0.25. If the upper most block is prevented from moving by a horizontal cable to a vertical wall, find the horizontal force that must be applied at the middle block without causing motion to impend.
- A puck weighs 8 lb and rests on the center of the frictionless surface of the ramp supported in equilibrium by ropes AC and BC. Determine the normal force the ramp exerts on the puck as well as the tension in each of the two ropes. g Variable Value Values for dimensions on the figure are given in the following table. Note the figure may not be to scale. a b C d e f g9 36.0 in 45.0 in 13.5 in 27.7 in 45.0 in 18.0 in 35.0 in B The normal force acting on the puck is pounds The tension in rope AC is The tension in rope BC is C pounds pounds1. The center of gravity of the 60 kN block is at G. The static coefficient of friction between the block and the inclined surface is 0.30. Determine; a. the frictional force between the block and the inclined plane. b. the smallest force P for which the block will move up the inclined plane without tipping. c. the largest distance h for which the block will move up the inclined plane without tipping. G P 1.0m 0.80m 20° 0.50m 0.50mThe 250 lb uniform crate (center of gravity at G) shown in the figure must be moved without tipping. The applied force P is horizontal. 1.5 ft 1.5 ft Determine: a. The largest coefficient of static friction between the crate and the floor that allows the crate to slide and 2.5 ft P. not tip 4.5 ft b. The corresponding magnitude of P 3.5 ft Include all needed FBD's to solve, and put units on your answers.