A threaded steel rod (Es 5 210 GPa, dr 5 15 mm, ctes 5 12 3 1026/°C) is held stress-free between rigid walls by a nut and washer (dw 5 22 mm) assembly at each end. If the allowable bearing stress between the washer and wall is 55 MPa and the allowable normal stress in the rod is 90 MPa, the maximum permissible temperature drop ?T is approximately:
(A) 25 8C
(B) 30 8C
(C) 38 8C
(D) 46 8C
(A) 25 8C
Physics & Space Science
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