... P = 25×103N U=∑ 2EA 2PL = (2)(200 (25×10 ×104)( 3 314.16 ) 2 (1.2) ×10−6) + (2)( (25×103) 2 (0.8) 200×104)(201.06×10−6) (1) U = 5.968+6.213=12.18 N− ...
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