Determine the minimum value of weight W which may be applied without causing the 50-lb block to slip. The coefficient of static friction between the block and the plane is µ, = 0.2, and between the rope and the drum D µ; = 0.3. D W 45°
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- Calculate the horizontal force P on the light 13° wedge necessary to initiate movement of the 59-kg cylinder. The coefficient of static friction for both pairs of contacting surfaces is 0.33. Also determine the friction force Få at point B. (Caution: Check carefully your assumption of where slipping occurs.) P Answers: P = FB = i 138 59 kg B N N ADetermine the maximum cylinder weights W for which the system is in equilibrium. The coefficient of friction between the m 189-lb block and the incline is 0.20 and that between the cord and cylindrical support surface is 0.30. μ = 0.20 m 20° μ = 0.30 P WDetermine the maximum cylinder weights W for which the system is in equilibrium. The coefficient of friction between the m 165-lb block and the incline is 0.20 and that between the cord and cylindrical support surface is 0.30. μ = 0.20 m 20° μ = 0.30 W
- What would be the maximum and minimum weight that can be applied without causing the block on the inclined to slip. µs = 0.3 between the block and the plane. µs = 0.2 between the rope the drum. 50 Ib w 45°The 6.8-kg frame AC and 2.8-kg uniform slender bar AB of length lslide with negligible friction along the fixed horizontal rod under the action of the 75-N force. Calculate the tension Tin wire BC and the magnitude FA of the force exerted on the bar by the pin at A. The x-y plane is vertical. 75 N 52° 52 B Answers: T = ! N FA = ! N lleh L GAS A 45.0 kg sign hangs at the end of a bar where L = 3.10 meters in length. A cable attaches to the end of the horizontal bar and to a wall 2.70 meters above where the bar is attached to the wall. The bar has a mass of 13-kg. What is the tension in the cable? Give your answer in Newtons to 3 significant figures (no decimal places in this case).
- A 25-kg ladder, 4 m long, rests on a rough floor and against a vertical wall. The ladder makes an angle of 35° with the horizontal. It starts to slip when a man weighing 75 kg has dlimbed halfway up. f= 0.20 at the wall. Ladder Wall 350 10) What is the coefficient of friction at the floor in three decimal places?500 mm Situation 1. A hand truck is used to move two kegs, each of mass 40 kg. Neglecting the mass of the hand truck, determine (a) the vertical force P that should be applied to the handle to maintain equilibrium when a = 35', (b) the corresponding 350 mm A 80 mm reaction at each of the two wheels. P. В 300 mmThe cable AB prevents bar OA from rotating clockwise about the pivot O. If the cable tension is 740 N, determine the n- and t- components of this force acting on point A of the bar. 1.6 m B Answers: Tn' i 9 Tt= i II = 1.2 m 61° N N
- The uniform block shown in the figure weighs 200 lbs. It is pulled up the incline by the force P = 300 lbs. Determine the maximum and minimum values of d so that the block does not tip over as it slides up the incline. The coefficient of kinetic friction is 0.20. 4 LLL d A' 2' 3 P = 300 lbs.Determine the range of weights W for which the 99-lb block is in equilibrium. All wheels and pulleys have negligible friction. Assume W1 = 99 lb, µ, = 0.2, µz = 0.17,0 = 19°, p = 9°. Hs W. W Answer: ( i Ib) < W < ( i Ib)A cubical box is filled with sand and weighs 890 N. We wish to “roll" the box by pushing horizontally on one of the upper edges. What minimum coefficient of static friction between box and floor is required?