44 PKOBLEMS IN STEENGTH OF MATEEIALS 



401. 



tw Ib.p 

 1 



lb.perft. 



402. 



403. 



i JL. i J 



3200 Ib. 



404. 



10 r .JLs jo'- J 



IX. COLUMNS AND STEUTS 



405. Find the load to rupture a cast-iron cylindrical column with 

 flat ends, 15 feet long and 6 inches in diameter, both by Euler's and 

 Eankine's formulas. 



406. A cylindrical steel column with round ends is 36 feet long 

 and 6 inches in diameter. Calculate by Euler's formula the axial load 

 for rupture. 



407. Find the buckling load for a steel strut with rounded ends, 

 3 inches square and 2J- feet long, both by Euler's and Eankine's 

 formulas. 



408. Solve Problem 407 for a length of 9 feet. 



409. Solve Problem 407 for a length of 15 feet. 



410. A square wooden column with fixed ends is 20 feet long and 

 sustains a load of 10,000 pounds. Find its size by Euler's formula, 

 with a factor of safety for steady load. 



411. Find the breaking load for a solid round wrought-iron pillar 

 2 inches in diameter and 10 feet in length, with fixed ends. 



