Consider the tractor shown in (Figure 1). The front wheelsare free to roll. The tractor weighs 5200 lb and has acenter of gravity at G.FigureA5 ft 3 ft-B2 ft2 ft1 of 1 >Part AIf the coefficient of static friction between the rear wheels of the tractor and the ground is μ = 0.6, determine if the rear wheels slip or the frontwheels lift off the ground as the engine provides a torque M to the rear wheels.the front wheels lift off the groundthe rear wheels slipSubmitPart BM =What is the torque needed to cause the motion?Express your answer in kilopound-feet to three significant figures. Enter positive value if the moment is counterclockwise andnegative value if the moment is clockwise.SubmitRequest AnswerProvide FeedbackΑΣΦIvecRequest Answer?kip ftNext >

Here we will use the simple equilibrium equations.

Consider the tractor shown in (Figure 1). The front wheels are free to roll. The tractor weighs 5200 lb and has a center of gravity at G. Part A If the coefficient of static friction between the rear wheels of the tractor and the ground is μ =0.6, determine if the rear wheels slip or the front wheels lift off the ground as the engine provides torque M to the rear wheels. O the front wheels lift off the ground O the rear wheels slip Submit Part B Request Answer What is the torque needed to cause the motion? Express your answer in kilopound-feet to three significant figures. Enter positive value if the moment is counterclockwise and negative value if the moment s clockwise.

Consider the tractor shown in (Figure 1). The front wheels are free to roll. The tractor weighs 5200 lb and has a center of gravity at G. Part A If the coefficient of static friction between the rear wheels of the tractor and the ground is μ =0.6, determine if the rear wheels slip or the front wheels lift off the ground as the engine provides torque M to the rear wheels. O the front wheels lift off the ground O the rear wheels slip Submit Part B Request Answer What is the torque needed to cause the motion? Express your answer in kilopound-feet to three significant figures. Enter positive value if the moment is counterclockwise and negative value if the moment s clockwise.

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 7.24P: A uniform plank is supported by a fixed support at A and a drum at B that rotates clockwise. The...

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The screw of the clamp has a square thread of pitch 0.16 in. and a mean diameter of 0.6 in. The coefficient of static friction between the threads is 0.4. Determine (a) the torque C0 that must be applied to the screw in order to produce a 28-lb clamping force at A; and (b) the torque required to loosen the clamp.
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.
The coeffient of static friction between the uniform bar AB of weight W and the ground is 0.45. Find the smallest angle and the corresponding force P that would initiate simultaneous tipping and sliding of the bar.
The square-threaded screw 0f the C-clamp has a mean diameter of 8 mm and a pitch of 1.6 mm. The coefficient of static friction between the threads is 0.2. If the torque C=1.50Nm is used to tighten the clamp, determine (a) the clamping force; and (b) the torque required to loosen the clamp.
The single-threaded screw of the floor jack has a pitch of 0.5 in. and a mean radius of 1.75 in. The angle of static friction is 8.5. (a) Determine the couple C that must be applied to the screw to start lifting a weight of 4000 lb. (b) What is the couple required to start lowering the weight?
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.
A uniform plank is supported by a fixed support at A and a drum at B that rotates clockwise. The coefficients of static and kinetic friction for the two points of contact are as shown. Determine whether the plank moves from the position shown if (a) the plank is placed in position before the drum is set in motion; and (b) the plank is first placed on the support at A and then lowered onto the drum, which is already rotating.
The brake pads at C and D are pressed against the cylinder by the spring BF. The coefficient of static friction between each pad and the cylinder is 0.15. Find the smallest tension in the spring that would prevent the cylinder from rotating when the clockwise couple M=2200lbin. is applied. Neglect the weights of the members.
In (Figure 1), the man has a mass of 75 kg and the crate has a mass of 130 kg. The coefficient of static friction between his shoes and the ground is μs = 0.4 and between the crate and the ground is μc = 0.3.
The drum shown in the figure below has a weight of 100 N and rests on the floor for which the coefficient of static friction is 0.6. Assume tipping and determine the smallest value of P required for impending motion in N Assume sliding and determine the smallest value of P required for impending motion in N.
Two blocks A and B shown in (Figure 1) have a weight of 9 lb and 6 lb , respectively. They are resting on the incline for which the coefficients of static friction are μA = 0.13 and μB = 0.23. Determine the angle θ which will cause motion of one of the blocks. What is the friction force under each of the blocks when this occurs? The spring has a stiffness of k = 2 lb/ft and is originally unstretched. Part A Determine the smallest angle θ which will cause motion of one of the blocks. Express your answer in degrees to three significant figures. Part B Determine is the friction force under the block A at this angle. Express your answer to three significant figures and include the appropriate units. Part C Determine is the friction force under the block B at this angle. Express your answer to three significant figures and include the appropriate units.
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