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The normal pressure acting on the disk of the sander is given by
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Chapter 7 Solutions
International Edition---engineering Mechanics: Statics, 4th Edition
- The 600-lb cable spool is placed on a frictionless spindle that has been driven into the ground. If the force required to start the spool rotating is F = 160 lb, determine the coefficient of friction between the ground and the spool. Neglect the diameter of the spindle compared to the diameter of the spool.arrow_forwardThe 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.arrow_forwardThe single-plate clutch transmits the torque C from the input shaft on the left to the output shaft on the right. Compression springs between the clutch housing and the pressure plate provide the necessary pressure on the friction surface. The splines prevent the clutch plate from rotating relative to the output shaft. If Ri=4 in. and R0=9 in., determine the total force that must be applied to the pressure plate by the springs if the clutch is to transmit a torque of C=56lbft when it is new.arrow_forward
- The 449-N force is applied to the 81-kg block, which is stationary before the force is applied. Determine the magnitude and direction of the friction force F exerted by the horizontal surface on the block. The force is positive if to the right, negative if to the left.arrow_forwardWhat is the tension in the cord that connects the two blocks? What is the coefficient of kinetic friction that one block exerts on the other?arrow_forwardThe coefficient of static friction between the 50-kg crate and the ramp is μs = 0.35. The unstretched length of the spring is 800 mm, and the spring constant is k = 660 N/m. Determine the following: 1 The normal force acting on the crate is Blank 1 N. 2 The friction force acting on the crate is Blank 2 N. 3 The minimum value of x at which the crate can remain stationary on the ramp is Blank 3 mm.arrow_forward
- The floor-polishing machine rotates at a constant angular velocity. (Figure 1) If it has a weight of 76 lb , determine the couple forces F the operator must apply to the handles to hold the machine stationary. The coefficient of kinetic friction between the floor and brush is μk = 0.31. Assume the brush exerts a uniform pressure on the floor. Express your answer to three significant figures and include the appropriate units.arrow_forwardThe man is pedaling his bicycle at a constant speed up a slippery slope of 5%. The man and the bicycle have a total mass of 82 kg centered at G. If the rear wheel is about to slip, find the coefficient of friction u between the tire and the road. If the coefficient of friction were doubled, what friction force would act on the rear wheel? (Why can we neglect the friction under the front wheel?)arrow_forward1) 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.arrow_forward
- The weight of the motorcycle is 151 kg and the weight of the driver is 64 kg. Dimensions: l1 = 0,31 m and l2 = 0,23 m Determine the required frictional force.arrow_forwardThe car has a mass of 1.6 MgMg and center of mass at GG. If the coefficient of static friction between the shoulder of the road and the tires is μsμsmu_s = 0.40, determine the greatest slope θθ the shoulder can have without causing the car to slip or tip over if the car travels along the shoulder at constant velocity. Draw the free-body diagram of the car. Draw the vectors starting at the black dots. The location and orientation of the vectors will be graded.arrow_forwardA truck is traveling at 40 mph when the brakes are applied on all of its wheels, causing it to skid at about 33 feet before stopping. If the vehicle has a weight of 18 kips. Determine the constant horizontal force developed on the coupling at m, and the frictional force developed between the tires of the vehicle and the road during this time. The total mass of the trailer is 7 kips. Draw the fbd thank youarrow_forward
- International Edition---engineering Mechanics: St...Mechanical EngineeringISBN:9781305501607Author:Andrew Pytel And Jaan KiusalaasPublisher:CENGAGE L