*42. Many new cars are equipped with antilock brakes that prevent tires from sliding on slippery roads during sudden stops. A Honda Accord is traveling at a speed of 17.9 m/s (about 40 mi/h) on a snow-packed road when the driver applies the brakes. The effec- tive coefficient of static friction with and without antilock brakes is 0.764 and 0.615, respectively. How much less is the stopping distance with antilock brakes than without antilock brakes?

*42. Many new cars are equipped with antilock brakes that prevent tires from sliding on slippery roads during sudden stops. A Honda Accord is traveling at a speed of 17.9 m/s (about 40 mi/h) on a snow-packed road when the driver applies the brakes. The effec- tive coefficient of static friction with and without antilock brakes is 0.764 and 0.615, respectively. How much less is the stopping distance with antilock brakes than without antilock brakes?

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 7.58P: The screw of the carjack has a pitch of 0.1 in. and a mean radius of 0.175 in. Note that the ends of...

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The leather rein used to fasten the horse to the hitching rail weighs 3.5 oz per foot. The coefficient of static friction between the rail and the rein is 0.6. If a 34-lb force acting on the bridle is sufficient to restrain the horse, determine the smallest safe length L for the free end of the rein.
The screw of the carjack has a pitch of 0.1 in. and a mean radius of 0.175 in. Note that the ends of the screw are threaded in opposite directions (right- and left-handed threads). The coefficient of static friction between the threads is 0.08. Calculate the torque C0 that must be applied to the screw in order to start the 1200-1b load moving (a) upward; and (b) downward.
Two cars, one with and one without ABS, are stopping from the speed v0 = 100 km/h by full braking. The first without ABS by blocking the wheels, i.e. sliding (’kinetic friction’), the second with ABS with still rolling wheels (ideal ’limiting static friction’ assumed). Determine for both cars the time and the distance for stopping if the coefficients of static and kinetic friction between pavement and tire are μ0 = 0.7 and μ = 0.45, respectively.
A 100kg block slid down from a 30° incline. It traveled, from rest, down to 10 meters along the incline. If it took the block to travel that far in 1s, determine the reverse effective force if coefficient of friction is 0.2KINDLY ANSWER WITH COMPLETE SOLUTION PLS
Block A weighs 10.5 lb and block B weighs 6.5 lb. The static friction coefficient between blocks A & B is 0.32. The static friction coefficient between blocks B and the inclined surface is 0.37. If the incline is ? = 30∘ what is the smallest force P required for motion?
a. A 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 pushed with the handbrake drawn, and the vehicle thrust was reduced to 6 kg (G=10 m/s2). Determine the value of the coefficient of friction that occurs between the molecules of the lubricant. The speed of the vehicle increases to 3.6 km/h when the vehicle is moved by pushing on the oil film. Find the power spent on friction
The designer of a Ski resort wishes to have a portion of a beginner’s slope on which the skier’s speed will remain fairly constant as shown in Fig. 2(a) below. Tests indicate the average static and kinetic coefficients of friction between Ski and snow to be µs=0.1 andµk=0.08. What should be the slope angle θ at the constant speed section? [5
Q 1: Determine the maximum possible acceleration on a level road, assuming (a) fourwheeldrive, (b) rear-wheel drive, (c) front-wheel drive. Assuming the coefficient of static frictionbetween the tires and the road is 0.8.
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.
Six 5 N blocks are stacked vertically. The coefficient of static friction between the blocks is µs = 0.20. Determine the horizontal force that must be applied to the fifth block from the top of the stack, in order to slide it out without moving the other blocks.
The coefficient of static friction between A and C and between B and D is μs = 0.24, and between A and B is μs′ = 0.15. Neglect the weight of each wedge. (Figure 1) Determine the horizontal force P needed to pull out wedge A. Express your answer to three significant figures and include the appropriate units.
A crate has a mass of 120kg and the coefficient of static and kinetic friction is 0.60 and 0.50, respectively. The crate starts from rest and the motor exerts a tension T= 1220 + 200t (N). If the elevation of the dock is 30 degrees from the horizontal, What is the velocity of the crate after 1sec? Compute the power transmitted after 1sec. Provide FBD. Thank you.