At room temperature (20°C) a 0.7-mm gap exists between the ends of the rods shown. At a later time when the temperature has reached 150°C, determine: (a.)The normal stress in the aluminum rod, (b.) The chan in length of the aluminum rod. 0.7 mm 300 mm A Aluminum A =2,000 mm² E= 75 GPa a = 23 x 106/°C 250 mm B Stainless steel A = 800 mm² E= 190 GPa a 17.3 x 106,

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