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problem17_90

# University Physics with Modern Physics with Mastering Physics (11th Edition)

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17.90: In deriving Eq. (17.12), it was assumed that 0; = L if this is not the case when there are both thermal and tensile stresses, Eq. (17.12) becomes . 0 + = AY F T α L L For the situation in this problem, there are two length changes which must sum to zero, and so Eq. (17.12) may be extended to two materials a and b in the form . 0 b 0b a 0a = + + + AY F T α L AY F T α L b a Note that in the above,
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Unformatted text preview: A F T and , ∆ are the same for the two rods. Solving for the stress A, F Pa 10 2 . 1 ) C . 60 ( Pa)) 10 7 m (0.250 Pa) 10 20 m) 350 . (( m) 250 . )( ) (C 10 4 . 2 ( m) 350 . )( ) (C 10 (1.2 )) ( ) (( 8 10 10 1 5 1 5-b 0b a oa 0b b 0a ×-= ° × + × ° × + ° × = ∆ + +-=---T Y L Y L L α L α A F a to two figures....
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