The horizontal force P = 50 N is applied to theupper block with the system initially stationary.The block masses are ma = 10 kg and mg = 5 kg.Determine if and where slippage occurs for the fol-lowing conditions on the coefficients of static fric-tion: (a) µ = 0.40, µ2 = 0.50 and (b) µz = 0.30, µ2 =0.60. Assume that the coefficients of kinetic friction%3Dare 75 percent of the static values.P15 AH1

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Answered: The horizontal force P 50 N is applied…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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The 90-lb force P is applied to the 210-lb crate, which is stationary before the force is applied. Determine the magnitude and direction of the friction force Fexerted by the horizontal surface on the crate. The friction force is positive if to the right, negative if to the left. Assume 4, = 0.45, µz = 0.35. Answer: F = 94.5 Ib
1) Determine the average braking torque to be applied to stop the vehicle of mass 1.5 ton is movingdown the hill at a slope of 1:7 at 60 kmph and the vehicle is to be stopped at a distance of 50 m.Take the diameter of the vehicle tyre as 500 mm. If the friction energy is momentarily stored in a20 kg cast iron brake drum, what is the average temperature rise of the drum? The specific heat forcast iron may be taken as 520 J/kg ˚C.
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Question 2 A rope of length L = 2.8 m and mass m = 2 kg is initially at rest and can slide on an inclined surface with incline = 20° as shown in the figure. Assume that the part of the rope that is not on the inclined surface hangs down vertically at all times and that the static friction coefficient between the rope and the surface is μ = 0.49. 0 b a) Calculate the maximum value of b for which the rope will not start sliding down the slope.
Determine the minimum applied force P⃗ P→ required to move the wedge AA to the right. The sping is compressed a distance of 200 mm. Neglect the weight of AA and BB. The coefficient of static friction for all contacting surfaces is μs=0.3μs=0.3. Neglect friction at the rollers.
40 kg object is being pushed downwards at an angle of 32° with the horizontal. If the coefficient of static friction is 0.4 and dynamic friction 0.35. Determine (a) what must be the applied force P to overcome static friction and (b) what will be the required force P if the box is already moving. P 32° 40kg
Body U with mass 5m is stacked on the top body W with mass m, and released. The bodies are in contact along the frictionless interface at 45 to the vertical. The body U is in contact with the frictionless vertical wall. Body W lies on the floor with coefficient of friction u. Relevant h dimensions are shown in the figure. Express the results in U: 5m terms of given quantities: m, g, h and µ (except when u is given numerically). You need not evaluate sin 45° = cos 45° = 2/2. 45 1 Draw the free body diagrams for the two bodies. W: m Find the critical coefficient of friction µ. (i.e., the minimal coefficient friction to prevent sliding). 3h 31 Let u
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A rope of Length L = 3m and mass m= 3Kg is initially At rest and can slide on an inclined surface with Inclined theta = 15° as shown in the figure. Assume that the part of the rope that is not on the Inclined surface hanges down vertically at all times and that the static friction coefficient between the rope and the surface is MUs = 0.36 a) calculate the maximum value of b for which the rope will NOT start sliding down the slope. Assume that b = 0.33m and that the coefficient of kinetic friction between the rope and the Inclined surface is MUk = 0.27. Let y (in metres) be the distance travelled by the rope after it has been released from rest. b) calculate the initial acceleration of the rope Calculate the work done by gravity as a function of y c) calculate the work done by the friction force as a function of y Hence calculate the velocity of the rope at the moment the rope has just completely left the Inclined surface
is the coefficient of kinetic friction? A force of 1000 N is applied to a 1200-kg car. If the coefficient of rolling friction is 0.04, what is the car's acceleration? The coafficionts of static and kinetic friction for pectively 05 and 04 Jfa 150 k

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