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Enviado por: Albert 17 marzo 2011
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... ock? [pic]; Fc = 2630 N, No 1010. An 8lb object swings in horizontal circle with a speed of 95 ft/s. What is the radius of the path, if the centripetal force is 2000 lb? [pic] [pic]; R = 1.13 ft *1011. Two 8kg masses are attached to the end of a tin rod 400 mm long. The rod is supported in the middle and whirled in a circle. The rod can support a maximum tension of only 800 N. What is the maximum frequency of revolution? [ R = (400 mm/2) = 200 mm ] [pic]; v = 4.47 m/s [pic]; f = 3.56 rev/s *1012. A 500g damp shirt rotates against the wall of a washer at 300 rpm. The diameter of the rotating drum is 70 cm. What is the magnitude and direction of the resultant force on the shirt? [ R = (70 cm/2) = 35 cm; f = 300 rpm(60 s/min) = 1800 rev/s ] [pic]; Fc = 2.24 x 107 N, toward the center *1013. A 70kg runner rounds a track of radius 25 m at a speed of 8.8 m/s. What is the central force causing the runner to turn and what exerts the force? [pic]; Fc = 217 N, friction *1014. In Olympic bobsled competition, a team takes a turn of radius 24 ft at a speed of 60 mi/h. What is the acceleration? How many g’s do passengers experience? (60 mi/h = 88 ft/s) [pic]; ac = 323 ft/s2 or 10.1 g’s Flat Curves and Banked Curves 1015. On a rainy day the coefficient of static friction between tires and the roadway is only 0.4. What is the maximum speed at which a car can negotiate a turn of radius 80 m? [pic]; vc = 17.7 m/s or 63.8 km/h 1016. A bus negotiates a turn of radius 400 ft while traveling at a speed of 60 mi/h. If slipping just begins at this speed, what is the coefficient of static friction between the tires and the road? (60 mi/h = 88 ft/s) [pic]; (s = 0.605 1017. Find the coefficient of static friction necessary to sustain motion at 20 m/s around a turn of radius 84 m. [pic]; (s = 0.486 *1018. A 20kg child sits 3 m from the center of a rotating platform. If (s = 0.4, what is the max
imum number of revolutions per minute that can be achieved without slipping? (Slipping occurs when the centripetal force equals the maximum force of static friction.) [pic]; f = 0.182 rev/s (60 s/min); f = 10.9 rpm *1019. A platform rotates freely at 100 rpm. If the coefficient of static friction is 0.5, how far from the center of the platform can a bolt be placed to without slipping? f = 100 rev/min (1 min/60 s) = 1.67 rev/s; (s = 0.5; R = ? [pic]; R = 21.1 cm 1020. Find the required banking angle to negotiate the curve of Prob.1015 without slipping. [pic]; ( = 21.80 1021. Find the required banking angle for Problem 1016 to prevent slipping? [pic]; ( = 31.20 1022. The optimum banking angle for a curve of radius 20 m is found to be 280. For what speed was this angle designed? [pic]; v = 10.3 m/s *1023. A curve in a road 9 m wide has a radius of 96 m. How much higher than the inside edge should the outside edge be ... 
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