A brass wire of diameter d = 1/16 in. is stretched between rigid supports with an initial tension T of 37 lb (see figure). Assume that the coefficient of thermal expansion is 10.6 × 10-6 / °F and the modulus of elasticity is 15 × 106 psi.)
(a) If the temperature is lowered by 60°F, what is the maximum shear stress max in the wire?
(b) If the allowable shear stress is 10,000 psi, what is the maximum permissible temperature drop?
(c) At what temperature change ΔT does the wire go slack?

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