46 PROBLEMS IN STRENGTH 0-F MATERIALS 



diameter 8 inches ? Compare the load it could support for a length 

 less than 8 feet with the result obtained. 



427. Determine the load on a hollow, round, cast-iron column with 

 flat ends, external diameter 12 inches, thickness 1 inch, and length 

 14 feet, for a factor of safety of 8. 



428. A cylindrical, wrought-iron column with fixed ends is 10 feet 

 long, 6.4 inches outside diameter, 6 inches inside diameter, and carries 

 a load of 50,000 pounds. Find its factor of safety. 



429. Determine the size of a square, wooden column 30 feet long 

 with flat ends to safely sustain a steady load of 20 tons. 



430. Solve Problem 429 for a steady load of 7 tons. 



431. A square, wooden post 12 feet high is to support a load of 16 

 tons. What must be the size of the post for a factor of safety of 10? 



432. Find the size .of a square steel strut 8 feet long with round 

 ends to safely transmit a steady compressive load of 5 tons. 



433. Around, solid, wrought-iron pillar 10 feet in height is to support 

 a load of 40,000 pounds. Find its diameter for a factor of safety of 5. 



434. Determine the diameter of a round, solid, steel pillar 16 feet 

 high to safely support a steady load of 29,000 pounds. 



435. A round, solid, cast-iron strut 15 feet long with rounded ends 

 bears a compressive load of 10 tons. Find its diameter for a factor 

 of safety of 6. 



436. A hollow, square, wooden column with flat ends is to safely 

 support a steady load of 12,000 pounds. If the thickness of each 

 side is 1J- inches and length of column 20 feet, what should be the 

 outside and inside dimensions ? 



437. A cylindrical, structural steel connecting-rod 7J feet long is 

 subjected to a maximum compressive load of 21,000 pounds. Consid- 

 ering it to be a column with both ends hinged, determine its diameter 

 for a factor of safety of 10. 



438. A wrought-iron piston-rod has a diameter of 2 inches and a 

 length of 4 feet. Considering it to be a column with one end flat 

 and the other round, what is the allowable diameter of the piston, 

 if the steam pressure is 60 pounds per square inch, for a factor of 

 safety of 10? 



439. The diameter of a piston is 18 inches and the maximum steam 

 pressure 130 pounds per square inch. Find the proper diameter 



