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24_Problem CHAPTER 9

24_Problem CHAPTER 9 - PROBLEMS 9.19 AND 9.20 CONTINUED And...

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PROBLEMS 9.19 AND 9.20 CONTINUED And 2 34 2 22 4 a a a a xa x dx aa  −=   44 2 4 a a a = −− + Then 33 3 84 3 2 1 33 4 x hah a h a I =− = ππ 3 1.0484 x I ah = W and 3 1.0484 1.1644 0.77324 x x Ia h kh Aa h == = 1.164 x = W PROBLEM 9.20 yy I dI = ( ) 2 21 y dI x dA dA y y dx From Problem 9.19 12 s i n 2 h yhx yh x π = Now 3 2s i n 2 2 y x dI hx x h x dx    Then 3 i n 2 2 xx I dI h x x dx + ∫∫ Now using integration by parts 2 sin 2 ux d v x d x a 2 2c o s 2 a du xdx v x a Then sin cos cos 2 2 x xdx x x x xdx a
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