A plastic box is sitting on a steel beam. One end of the steel beam is slowly raised, increasing the angle of the surface until the box begins to slip. If the box begins to slip when the beam is at an angle of 41 degrees, what is the static coefficient of friction between the steel beam and the plastic box? 41°
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- Problem 2: Determine the force P necessary to start the V-shaped wedge to the right if the coefficient of friction is f= 0.445 at each of the three surfaces of contact. Wg =1000N WA =200N в P- 30° 150A 1.5 kg block resting ina rough flat surface is pulled by a string. The string makes an angle of 20 degress with the horizontal. The coefficient of static friction between the blodk and the surface is 0.35. What is the maximum tension in the string to keep the block unmoved?A 5.0kg crate is tasting on a horizontal plank. The coefficient of static friction is 0.50. You raise one end of the plank slowly. What is the maximum angle (with horizontal) you can go without the crate sliding down the incline?
- A 45 kg box is at rest at one end of a 2 meter board. That end of the board is slowly raised at an incline until the box starts to slide. At that point, the angle is at 34 degrees. The coefficient of kinetic friction is 0.50N. Please help me calculate the coefficient of static friction between both the box and the board?A large wrecking ball is held in place by two light steel cables. If the mass m of the wrecking ball is 3620 kg, what are (a) the tension TB in the cable that makes an angle of 40 with the vertical and (b) the tension TA in the horizontal cable?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?
- The base of an automobile jackstand forms an equilateral triangle of side length 12 in. and is centered under the collar A. Model the structure as one with a ball and socket at each joint and determine the force in members BC, BD, and CD. The forces are positive if in tension, negative if in compression. Neglect any horizontal reaction components under the feet B, C, and D. Assume F-700 lb, b-12 in., h-17 in. Answers: BC- i BD= i CD- i lb lb lbThe block A in the figure supports a load W=1000 lb and is to be raised by forcing the wedge B under it. The angle of friction for all surfaces in contact is 15°. Determine the force P necessary to start the wedge under the block. W-1000 lb 9-15° R1 R P=15°How much sand (in kgs) is needed to be added into the can in order to overcome friction from the table? The box and the can weighs 3.5 kg and 0.5 kg, respectively and the coefficient of static friction between the box and the table is 0.35. Assume the pulley is frictionless.
- 1( End A of horizontal slender rod AB presses against a rough vertical wall because it is supported by cord BC that makes angle 0 with the rod. The rod has length L, weight W, and is of uniform composition. What is the minimum value of the coefficient of static friction u that will maintain the rod in equilibrium? C A) tan 0 (cos 0)? C) D) sin O tan 0 -sin Lsin e W LA student wants to determine the coefficients of static friction and kinetic friction between a box and a plank by gradually raising one end of the plank. When the angle of inclination with the horizontal reaches 280 the box starts to slip and starts to slide 2.53 m down the plank in 3.92 s. Find the coefficients of friction.The masses of the box at right is 30 kg. The coefficient of static friction between each box and the inclined surface is us = 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.