180_Problem CHAPTER 9 - PROBLEM 9.137 CONTINUED Also Iy =...

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PROBLEM 9.137 CONTINUED Also ( ) ( ) ( ) 1 2 3 y y y y I I I I = + + ( ) 2 2 2 2 2 2 2 1 38 24 38 24 0.80438 lb s /ft ft ft 12 12 12 2 12 2 12 = + + + × × ( ) 2 2 2 2 1 38 38 0.402186 lb s /ft ft 18 12 3 12 + + × ( ) 2 2 2 1 24 0.39900 lb s /ft ft 4 12 + ( ) 2 3.76122 0.672172 0.3990 lb ft s = + + 2 4.83234 lb ft s = or 2 4.83 lb ft s y I = W ( ) ( ) ( ) 1 2 3 z z z z I I I I = + + ( ) 2 2 2 2 1 38 38 0.80438 lb s /ft ft 12 12 2 12 = + × ( ) 2 2 2 2 2 2 1 38 24 38 24 0.401286 lb s /ft ft 18 12 12 3 12 3 12
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