. The elements of railroad engineering . 3^ feet ? Ans. 105 tons. (565) In Fig. 3, the force/*is 1|tons and acts at an angle of 30° with the horizon-tal. The width d of thetimber tie rod is 4inches. Find the safelength a necessary toprevent shearing on thesurface a b. Ans. in. (566) Show that acylindrical boiler istwice as liable to rup-ture along a longitudinal seam as along a transverse seam.^ (567) Assuming that the strength of the boiler plate isreduced 40^ owing to the area lost by the rivet holes, whatshould be the thickness of the plate of a wrought-iron boiler4 feet in diameter wh
. The elements of railroad engineering . 3^ feet ? Ans. 105 tons. (565) In Fig. 3, the force/*is 1|tons and acts at an angle of 30° with the horizon-tal. The width d of thetimber tie rod is 4inches. Find the safelength a necessary toprevent shearing on thesurface a b. Ans. in. (566) Show that acylindrical boiler istwice as liable to rup-ture along a longitudinal seam as along a transverse seam.^ (567) Assuming that the strength of the boiler plate isreduced 40^ owing to the area lost by the rivet holes, whatshould be the thickness of the plate of a wrought-iron boiler4 feet in diameter which sustains a steam pressure of 120 sq. in ? Assume factor of safety for steady stress. Ans. .35 in. (568) What should be the thickness of a 6 cast-ironwater pipe to carry a steady pressure of 200 lb. per sq. in. ? Ans. .18 in. (569) What should be the thickness of a wrought-ironboiler tube 3 in diameter, 12 ft. long, and exposed to anexternal steam pressure of 130 lb. per sq. in. ? Use a factorof safety of 10. ~ Ans. .272 Fig. 3. STRENGTH OF MATERIALS. 593 (570) A cast-iron cannon of 4 bore is subjected to aninternal pressure of 2,000 lb. per sq. in. on being fired; whatshould be the thickness of the metal in order that it shall notbe subjected to a stress of more than 2,800 lb. per sq. Ans. 5 in. (571) A structure of the nature of a simple beam is 100feet long between the supports, and carries three equalloads of 1,200 lb. each, at distances from the left support of40, 00, and 80 ft. {a) Find the maximum bending moment;(/?) the shear at a distance of 30 ft. from the left support;(c) the maximum shear. ( (a) 748,800 Ans. -j (^) 1,440 lb. ( (r) -2,160 1b. (572) Find graphically the magnitude, direction, and position of the resultant of the forces shown in Fig. 4. Note.—In Figs. 4 and 6, the line ;// n is drawn simply to locatethe forces. Thus, in Fig. 4, /-^ makes an angle of 47^° with m 7t; F^
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
