1. The man pushes against the stack of four uniform boxes each weighing 20 lb. If P = 10 lb, determine if the boxes (both individually or as a stack) will slip or tip. The coefficient of static friction between each box is μs = 0.6 and between the floor and the bottom box is μ² = 0.4. P 1.5 ft 1.5 ft 5.5 ft 1.5 ft -2 ft- 1.5 ft
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- Jamal and Dayo are lifting a large chest, weighing 207 lb, by using the two rope handles attached to either side. As they lift and hold it up so that it is motionless, each handle makes a different angle with respect to the vertical side of the chest (Fig. P5.76). If the angle between Jamals handle and the vertical side is 25.0 and the angle between Dayos handle and the vertical side of the chest is 30.0, what are the tensions in each handle? FIGURE P5.760.4 m- B 1.5 m 0.4 m A 0.8 m y. 1.5 m 1.5 m Three vertical wires are used to support a rectangular plate which weighs 500 N. Determine the tension in the wires.The mass of the right box is 50kg. The coefficient of static friction between between each box and the inclined surface is p. = 0.2. If a = 40°, determine a. The minimum value of the mass at the left to maintain equilibrium. b. The maximum value of the mass at the left to maintain equilibrium. 100
- 6. A box is on a ramp inclined at 25° to the horizontal. The coefficient of static friction is .30, and of kinetic friction .20. 1²=30 pe Me=20m a. The box slides down the ramp. b. The box stays on the ramp without slipping. c. The box first slips, but then stays fixed after slowing down. d. We need the mass of the box to answer the question. 3250 www th mg OL M = mg COSTSatics 0.4 m. B 15 m L0.4 m 0.8 m 1.5 m 15m Three vertical wires are used to support a rectangular plate which weighs 500 N. Determine the tension in the wires.7. A 105 kg scaffold is 5.20 m long. It is hanging with two wires, one from each end. A 560 kg box sits 1.30 m from the left end. What is the tension in the left hand side wire?(g = 9.8 m/s2)
- QUESTION 5 A 250 kg man climbe a 10 m, 40 kg ladder successfully to its top. The ladder is not at 60 degrees between the ladder and the flat ground. The contact between the ladder and the vertical wall is frictionless. What is the smallest value of statio friction between the ladder and the floor that would allow him NOT to slip? O0.50 Ob.0.55 Oc.0.60 Od.0.65 O0.70 QUESTION 6 A 2000 kg beam is attached to a wall at the beam's left end by a hinge to the wall. The beam is supported by a cable anchored in the wall and attached to the right ond of the 20 m beam. The cable is attached to the beam making a 40 degree angle between the horizontal beam and the cable. What must the tension in the cable be? Oa 8762 N Ob. 10540 N OC. 12793 N od 13647 N Oe. 15246 N2. A 16.5-lb block B rests as shown on a 33-lb bracket A. The coefficients of friction are µs = block B and bracket A, and there is no friction in the pulley or between the bracket and the horizontal surface 0.35 and u = 0.28 between a. Determine the maximum weight of block C if block B not slide on bracket A. b. If the weight of block C is 10 percent larger than the answer found in a, determine the accelerates of A, B and C. A B 4/ 4 ...23. A 98N force is needed to push a 45kg box across the wooden floor. What is the value of the coefficient of static friction across the floor and the box? Group of answer choices 0.012 0.222 0.212 No answer 0.122
- 1. Suppose a block with mass 2.00 kg is resting on a ramp. If the coefficient of static friction between the block and the ramp is 0.370, what maximum angle can the ramp make with the horizontal before the block starts to slip down? UMC T UC KI8. A block is at rest on a rough inclined plane and is connected to an object with the same mass as shown. The rope may be considered massless; and the pulley may be considered frictionless. The coeffi- cient of static friction between the block and the plane is us; and the coefficient of kinetic friction is k 0 A. g D. g - Hk sin(0) m a. What is the magnitude of the static frictional force acting on the block? B.m g [1 - sin(0)] C. mg D. mg cos(0) B. g - Hk cos(0) A. m g sin(0) E. mg [1 - cos(0)] b. If the rope were cut between the block and the pulley, what would be the magnitude of the acceleration of the block down the plane? C. g [sin(0) - μ cos(0)] sin(0)] c. If the mass of the suspended object is doubled, what will be the acceleration of the block up the plane? B. g [2 tan(0) - uk sin(0)] D. 2g [μ sin(0) - cos(0)] m E. g [tan (0) A. g [2 - μk sin(0)] C. g [2 cos(0) - μ sin(0)] E. g [2 sin(0) Hk Cos (0)]. -5. Determine the maximum horizontal force P one can apply without causing motion if the mass of crate A is 200 kg. The coefficient of static friction at all contacting surfaces is μs=0.3. Neglect the mass of the wedge. Guide questions: a. How many FBDs are needed to analyze the problem? Will the wedge at the bottom move at all? 115⁰ b. The problem is asking for the maximum horizontal force P. What will happen if the applied force exceeds this maximum force? What is the impending motion of the bodies? B