The wheel shown supports a load of 500 lb. The hub fits loosely over an axle of diameter 1.3 in and turns with a coefficient of friction of 0.15. The moment required to overcome friction in the journal bearing at the hub is best given by
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- The position of the automobile jack shown is controlled by a screw ABC that is single-threaded at each end (right-handed thread at A, left-handed thread at C ). Each thread has a pitch of 2.5 mm and a mean diameter of 9 mm. If the coefficient of static friction is 0.15, determine the magnitude of the couple M that must be applied to raise the automobile.An elevator type lift is being designed to raise a load up to 5,000pounds between floors. Twosquare-thread lead screws, 1.5 inches in (major) diameter, are used for this application. Determine the torque required to raise this lift if the moving part of the elevator weighs 800 pounds and the coefficient of friction is assumed to be 0.15.The uniform bars shown are joined by a frictionless pin at their tops. Thecoefficient of friction between the bars and the floor is 0.30. What is the value of θ whenmotion spends?
- 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.Problem -03Dry FrictionA band belt is used to control the speed of a flywheel as shown in figure-3.Determine the magnitude of the couple being applied to the flywheel, knowing that the coefficient of kinetic friction between the belt and the flywheel is 0.25 and that the flywheel is rotating clockwise at a constant speed. Show that the same result is obtained if the flywheel rotates counterclockwise.A safety device used by workers climbing ladders fixed to high structuresconsists of a rail attached to the ladder and asleeve that can slide on theflange of the rail. A chain connects the worker’s belt to the end of aneccentric cam that can be rotated about an axle attached to the sleeve at C.Determine the smallest allowable common value of the coefficient ofstatic friction between the flange of the rail, the pins at A and B, and theeccentric cam if the sleeve is not to slide down when the chain is pulledvertically downward.
- The 50 N homogeneous bar AB is suspended from a rope that runs over a small peg at C. The bar is kept in the position shown by the horizontal force P. Determine the smallest coefficient of static friction at C for which the bar will be at rest.8. Answer the following questions about the exercise of Box A (massmA=50kg) and Box B (mB=10kg) located on the slope as shown in Figure 7. Between slope and box A, the coefficient of static friction is uk, and the angle of slope is 10 degrees, although box A and B are connected in a solid line and ignore the mass of the pulley.1)What is the maximum friction (kgf) between Box A and Slope for us=0.4 and Uk=0.15?2)What is the maximum friction between Box A and the slope (kgf) for us=0.3 and UK=0.15?3)us=0.3 and Uk=0.15 What is the tension in kgf?4)us=0.3 and uk=0.15 when box B goes down 2m, calculate the size (m/s) of the speed of box A and box B using the modified energy supply law.The square-threaded worm gear shown has a mean radius of 2 in. and a lead of 0.5 in. The large gear is subjected to a constant clockwise couple of 9.6 kip.in Knowing that the coefficient of static friction between the two gears is 0.12, determine the couple that must be applied to shaft AB in order to rotate the large gear counterclockwise. Neglect friction in the bearings at A, B, and C.
- An eighteen-wheel truck is rated at a gross (total) load carrying capacity of 260,000 lbs (including truck and trailer). If each tire has a contact area of 12" x 12", determine the tire pressure needed to safely carry the rated load. Assume weight distributed equally to all tires.Refer to Fig 33. The homogenous body A weighs 120 lb. The coefficients of frictions are 0.30 between A and the plane and 2/pi between the rope and the drum. What value of W will cause motion of A to impend? Give solution. (Ans. W= 81.5 lb)4.110 - A 3m uniform plank of weight 203 N rests on two joists as shown.The coefficient of static friction between the joists and the plank is 0.40. (a) Determine the magnitude of the horizontal force Prequired to move the plank. (b) Solve part a assuming that a singlenail driven into joist A prevents motion of the plank along joist A.