vehicle with the handbrake drawn must be pushed and moved. The vehicle weight is 1200 kg, and the force required to push the vehicle is 300 kg (G=10 m/s2 can be taken). Determine the value of the coefficient of friction that occurs when the wheels of the car make a sliding movement on the asphalt. As the car is pushed and moved, the speed of the car increases to 3.6 km/h. Find the power spent on friction b. An oil film was formed under the wheels while the same vehicle was

vehicle with the handbrake drawn must be pushed and moved. The vehicle weight is 1200 kg, and the force required to push the vehicle is 300 kg (G=10 m/s2 can be taken). Determine the value of the coefficient of friction that occurs when the wheels of the car make a sliding movement on the asphalt. As the car is pushed and moved, the speed of the car increases to 3.6 km/h. Find the power spent on friction b. An oil film was formed under the wheels while the same vehicle was

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.73P: The normal pressure acting on the disk of the sander is given by p=(4/3)+(r2/6), where p is the...

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The normal pressure acting on the disk of the sander is given by p=(4/3)+(r2/6), where p is the pressure in pounds per square inch (psi) and r represents the radial distance in inches. Determine the torque C required to operate the sander at constant speed if the kinetic coefficient of friction for the surface being sanded is 0.86.
Calculate the horizontal force P required to push the 85-lb lawn mower at constant speed. The center of gravity of the mower is at G, and the coefficients of rolling resistance are 0.12 for the front wheels and 0.18 for the rear wheels.
Two identical chairs, each weighing 14 lb, are stacked as shown. The center of gravity of each chair is denoted by G. The coefficient of static friction is 0.2 at B (the contact point between the chairs) and 0.35 at A, C, and D. Determine the smallest force P that would cause sliding.
The figure shows a steel bar being processed by a rolling mill. Given that P=80kN and r =0.016, determine the force F required to advance the bar at a constant speed.
The block of weight W is pulled by the force P inclined at the angle to the horizontal. Find the smallest force P and the corresponding angle that would cause impending sliding of the block. The angle of static friction between the block and the ground is s.
1. A truck is weighing 1.4 KN moves up a slope of 15 °. What is the force generated by the engine if the truck is accelerating at a rate of 3 m/s2? Assume the coefficient of friction is μ =0.1.
Block A weighs 500 N and block B weighs 280 N. Block A is held by a cord fastened to the wall. Force P is applied on B to drag it to the left at constant speed. The coefficient of friction between A and B is 0.30 and that between B and the floor is 0.32. Find the following (a) the normal force exerted by B on A, FNA (b) the tension in the cord attached to A, T (c) the frictional force exerted by B on A, fA (d) the force applied on B, P (e) the frictional force exerted by the ground on B, fB.
A 150 lb man can climb up15 ft on a 20 ft ladder before it slips. What must the coefficient of friction be if the ladder is arranged so that its base makes an angle of 50 ̊ with the ground? Assume the ladder to be uniform and weighing 100 lb.
To climb a 400 meter high mountain, you have two options, a straight line route with a 40 ° slope or a route composed of 5 equal sections (same length) each with a 20 ° slope. If traveling in a car with a mass of 1280 kg and a maximum power of 88 kW, Determine (assume the whole car as a particle): a) Is the friction enough to prevent the car from sliding? The coefficient of static friction of the tires with the ground is 0.95. b) What is the power required to climb the 40 ° slope at a constant speed of 40 km / h? Does the car have enough power to go up at that speed? c) What is the constant speed at which the 40 ° slope can be climbed with a 60 kW power? d) What is the power required to climb a 20 ° slope at 40 km/h? Does the car has enough power to go up at that speed? e) In which of the two trajectories does the car do more work? Ignore the resistance of the air and rolling resistance and radius of curves between sections of the compound route. Please add the free body diagram.
A car travelling in a constant velocity wants to turn in a 10m radius flat curve. If the coefficients of static and dynamic friction are 0.4 and 0.2, respectively, determine the car's velocity in kph.
A block of mass 14 kg is resting on a table is pulled by a force of 100 N. The coefficient of friction between table and block is .34. Calculate the acceleration of the block.
A force of 150 N pushes a 100 N block up an incline whose slope is 3 vertical to 4 horizontal. If the coefficient of kinetic friction is 0.12, determine the time required, in seconds, to increase the velocity of the block from 3 to 15 m/sec. The force is applied parallel to the incline.