48 PROBLEMS IN STRENGTH OF MATERIALS 



449. Determine the size of a square wooden column, 10 feet long, 

 with fixed ends, to carry an eccentric load of 15 tons, eccentricity 

 2 inches, with a factor of safety of 10. 



450. A hollow, cylindrical, cast-iron column with fixed ends, 10 

 inches external diameter, 8 inches internal diameter, and 10 feet long, 

 is loaded with 80,000 pounds 2 inches out of center. Determine the 

 factor of safety. 



X. TORSION 



451. Find the horse-power that can be transmitted by a cast-iron 

 shaft 3 inches in diameter and making 10 R.P.M., with a factor of 

 safety of 10. 



452. Find the diameter of a solid, wrought-iron, circular shaft to 

 safely transmit 150 H.P. at a speed of 60 R.P.M. 



453. Calculate the diameter of a structural steel shaft to transmit 

 300 H.P. at a speed of 200 R.P.M., with a factor of safety of 6. 



454. Find the H.P. that can be safely transmitted by a cast-iron, 

 circular shaft 7 inches in diameter and making 80 R.P.M. 



455. What should be the diameter of a structural steel shaft to 

 safely transmit 500 H.P. at 200 R.P.M.? 



456. Calculate the H.P. that a round, wrought-iron shaft 8 inches 

 in diameter and making 150 R.P.M. will transmit with a factor of 

 safety of 6. 



457. Find the diameter of a wrought-iron shaft to transmit 5000 

 H.P. at 100 R.P.M., with a factor of safety of 10. 



458. Calculate the diameter of a structural steel engine-shaft to 

 transmit 4000 H.P. at 50 R.P.M., with a factor of safety of 10. 



459. Find the factor of safety for a wrought-iron shaft 3 inches in 

 diameter when transmitting 40 H.P. at 100 R.P.M. 



460. Determine the factor of safety for a structural steel shaft 

 2 inches in diameter and transmitting 25 H.P. at 100 R.P.M. 



461. What' H.P. can be transmitted, with a factor of safety of 6, by 

 a hollow, wrought-iron shaft, external diameter 12 inches, internal 

 diameter 10 inches, and making 60 R.P.M. 



462. Find the speed for a hollow, cast-iron shaft, 10 inches outside 

 diameter, 6 inches inside diameter, to transmit 750 H.P. with a factor 

 of safety of 10. 



