A 2.850 kg block of wood rests on a steel desk. The coefficient of staticfriction between the block and the desk is µ, = 0.455 and the coefficient ofFkinetic friction is µ = 0.355. At time t = 0, a force F = 7.82 N is appliedmhorizontally to the block. State the force of friction applied to the block byUs.kthe table at times t = 0 and t > 0.t = 0Nt > 0Consider the same situation, but this time the external force F is 15.8 N. Again, state the force of friction acting on the block attimes t = 0 and 1 > 0.t = 0t > 0 A heavy sled is being pulled by two people, as shown in thefigure. The coefficient of static friction between the sled andthe ground is H = 0.603, and the kinetic friction coefficientis µ = 0.403. The combined mass of the sled and its load ism =336 kg. The ropes are separated by an angle o = 25.0°,and they make an angle 0 = 31.1° with the horizontal.Assuming both ropes pull equally hard, what is the minimumrope tension required to get the sled moving?minimum rope tension:If this rope tension is maintained after the sled starts moving, what is the sled's acceleration?m/s2acceleration:

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Answered: A 2.850 kg block of wood rests on a…

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter5: More Applications Of Newton’s Laws

Section: Chapter Questions

Problem 61P

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A 118 kg box sits on a flat surface where it has a static friction coefficient of us = 0.524 anda kinetic friction coefficient of Mx = 0.318. What is the minimum horizontal force that a worker mustapply in order to get the box to begin moving?
a child is pulling a box of mass 7.56 kg along a rough horizontal surface with the coefficient of dynamic friction of 0.463. The rope is horizontal and is pulled with a tension of 6.81 newtons. Starting from rest, how long will it take for the box to move by 15.2 meters?
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On a rough surface you want to pull a heavy object of 125 kg, if the coefficient of friction is µk = 0.31, what force would be necessary to move the object at constant speed?

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