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Unformatted text preview: 1530Chapter 15: Homework Problems8.1 Lets start with a simple problem. Determining the forces on the front and rear tiresof car that weighs 2400 lbs. You may assume thata= 2.15ft.andb= 2.65ft.. Whaterror do you obtain if you assume that the car is a point mass and all four wheels carrythe same load?abChapter 15: Homework Problems15318.2 In this case, we will assume that the truck weighs 3900 lbs. and the load it is carryingweighs 750 lbs. Does the truck tip over? You may assume,a= 0.45ft.,b= 3.1ft., andc= 2.6ft..abcGWAB1532Chapter 15: Homework Problems8.3 Shown below is a novel van hatch mechanism being closed. As a design exercise, determine the necessary force in each of the two hydraulic struts AC if the downward force F= 10 lbs. The mass center of the 90 lb. door is 1.5 inches directly below point A. Treatthe problem as twodimensional. The dimensions,a,b,c,anddare 2.5 in., 9 in., 3.5 ft,and 3.7 ft., respectively. The horizontal distance betweenFand point A is 7 in.abcdABCFChapter 15: Homework Problems15338.4 If the force applied to the brakes is 100 N, and the dimensions,a,b,c,d, andeare 6 cm,3 cm, 4 cm, 2.8 cm, and 4 cm, respectively. The angleLis 25o. If the spring constant(link AB) is 10,000 N/m, how much deflection occurs at point B when the brakes areapplied. 1 a b c d e F A B C D 1534Chapter 15: Homework Problems8.5 A portion of the shifter mechanism of a manual car transmission is shown in the figure.For the 3.75 lb. force exerted on the shift knob (it makes an angle with the horizontalof 30o, determine the corresponding forceF2exerted by the shift link BC on the transmission (not shown). Neglect friction in the ballandsocket joint at D, in the joint atB, and in the slip tube near support C. Note that a soft rubber bushing at C allows theslip tube to selfalign with link BC. The dimensionsa,b,c,d,e,andfare 8 in., 0.5 in.,1.25 in., 7.25 in., 3.8 in., and 1 in., respectively....
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This note was uploaded on 12/21/2011 for the course ME 270 taught by Professor Murphy during the Fall '08 term at Purdue UniversityWest Lafayette.
 Fall '08
 MURPHY

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