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Ch_8_homeworks_updated

Ch_8_homeworks_updated - 15-30 Chapter 15 Homework Problems...

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15-30 Chapter 15: Homework Problems 8.1 Let’s start with a simple problem. Determining the forces on the front and rear tires of car that weighs 2400 lbs. You may assume that a = 2 . 15 ft. and b = 2 . 65 ft. . What error do you obtain if you assume that the car is a point mass and all four wheels carry the same load? a b

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Chapter 15: Homework Problems 15-31 8.2 In this case, we will assume that the truck weighs 3900 lbs. and the load it is carrying weighs 750 lbs. Does the truck tip over? You may assume, a = 0 . 45 ft. , b = 3 . 1 ft. , and c = 2 . 6 ft. . a b c G W A B
15-32 Chapter 15: Homework Problems 8.3 Shown below is a novel van hatch mechanism being closed. As a design exercise, deter- mine 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. Treat the problem as two-dimensional. The dimensions, a, b, c, and d are 2.5 in., 9 in., 3.5 ft, and 3.7 ft., respectively. The horizontal distance between F and point A is 7 in. a b c d A B C F θ

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Chapter 15: Homework Problems 15-33 8.4 If the force applied to the brakes is 100 N, and the dimensions, a , b , c , d , and e are 6 cm, 3 cm, 4 cm, 2.8 cm, and 4 cm, respectively. The angle θ L is 25 o . If the spring constant (link AB) is 10,000 N/m, how much deflection occurs at point B when the brakes are applied. θ 1 a b c d e F A B C D
15-34 Chapter 15: Homework Problems 8.5 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 horizontal of 30 o , determine the corresponding force F 2 exerted by the shift link BC on the trans- mission (not shown). Neglect friction in the ball-and-socket joint at D, in the joint at B, and in the slip tube near support C. Note that a soft rubber bushing at C allows the slip tube to self-align with link BC. The dimensions a, b, c, d, e, and f are 8 in., 0.5 in., 1.25 in., 7.25 in., 3.8 in., and 1 in., respectively.

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Ch_8_homeworks_updated - 15-30 Chapter 15 Homework Problems...

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