A towing machine can deliver horizontal towing force T by a strong, inelastic cable. Thetowing force T can vary as shown in the graph. A 490 kg timber, initially at rest, is attachedto the towing machine. The static friction coefficient between the timber and the surface isHk=0.49, and the towing machine must overcome the minimum force needed to move thetimber against the static friction. If the kinetic friction coefficient between the timber and thesurface is u = 0.39, determine the velocity of the timber at t 6.5 seconds.%3DMT (N)2000T=125r(s)4.

given:-μs=0.49 μk=0.39 m=490kg

Answered: A towing machine can deliver horizontal…

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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A towing machine can deliver horizontal towing force T by a strong, inclastic cable. The towing force T can vary as shown in the graph. A 490 kg timber, initially at rest, is attached to the towing machine. The static friction coefficient between the timber and the surface is Hk = 0.49, and the towing machine must overcome the minimum force needed to move the timber against the static friction. If the kinetic friction coefficient between the timber and the surface is µg = 0.39, determine the velocity of the timber at t= 6.5 seconds. M T (N) 2000 T=125 (s)
A bicycle and rider, travelling at 12 km/hr on a level road, have a mass of 105 kg. A brake is applied to the rear wheel, which is 800 mm in diameter. The pressure force on the brake is 80 N and the coefficient of friction is 0.06. Find the distance covered by the bicycle and the number of turns of its wheel before coming to rest.
A flatbed truck traveling at 125 kph circles a horizontal curve with a radius of 317 m that is inwardly banked at 10°. The static friction coefficient between the truck bed and the 222-kg crate it transports is 0.66. Calculate the friction force (N) acting on the crate. 10°
3. Two blocks, mı = 9 kg and mɔ = 15 kg, are connected by a light string that passes over a frictionless pulley as shown in the figure. The first block lies on a horizontal surface and is connected to a spring with 45 N/m force constant. The system is released from rest when the spring is at equilibrium (unstretched). If the kinetic friction between mị and the surface is 0.20, calculate: (a) the distance h which the hanging block falls before coming to rest. (b) the work done by the spring on mị (c) the work done by the string on m || k
Q 40/A homogeneous bar of length / and weight w lb rests horizontally as shown in Fig. 40 with its free endon a block of weight W. the block W is at rest on a plane inclined at the angle a with the horizontal. Determine the necessary coefficient of friction u between the block and the plane for equilibrium. Assume no friction between the bar and the block.
Question A 4.0 kg mass, ml, hangs from a rope that runs over a massless frictionless pulley and is connected to a 6.0 kg mass, m2, resting on the surface at an incline of 0 = 35 as shown in Figure (1). The coefficient of static friction between the incline and m2 is 0.09, and the coefficient of kinetic friction is 0.07. Initially, the system is at rest. Calculate (a)the acceleration of the masses (b) the tension in the string. pulley m- Fig. 1
Blocks A, B, and C are placed as in Fig. and connected by ropes of negligible mass. Both A and B weigh 25.0 N each, and the coefficient of kinetic friction between each block and the surface is 0.35. Block C descends with constant velocity. (a) Draw separate free-body diagrams showing the forces acting on A and on B. (b) Find the tension in the rope connecting blocks A and B. (c) What is the weight of block C? (d) If the rope connecting A and B were cut, what would be the acceleration of C?
The friction coefficients between the wooden crate and the inclined plane are indicated in the drawing, respectively. Determine (a) the friction force F acting on the crate when force P is 200 N to the block at rest, (b) the force P needed to begin motion up the incline from rest, and (c) the friction force F acting on the block when force P is 600 N.
A horizontal force is exerted on a 150 lb chair at rest. The coefficient of static friction between the chair and the floor is 0.55. Determine the maximum horizontal force that can be applied to the chair before it moves.

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