29_Problem CHAPTER 9

29_Problem CHAPTER 9 - PROBLEM 9.34 Determine the moment of...

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PROBLEM 9.34 Determine the moment of inertia and the radius of gyration of the shaded area with respect to the y axis. SOLUTION First note that 123 A AAA = −− ( )( ) ( )( ) 100 mm 120 mm 80 mm 40 mm =− ( )( ) 2 80 mm 20 mm 7200 mm −= 22 (12 000 3200 1600)mm 7200 mm = Now ( ) ( ) ( ) yy y y I III =−− where () 3 64 1 1 120 mm 100 mm 10 10 mm 12 y I == × 3 2 1 40 mm 80 mm 1.7067
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