Engineering, 19.02.2020 05:19, katelynwest1

A copper wire has a diameter "d" is heated by a short circuit to "T_0" before a slow-blow fuse burns out. If the still air temperature is "T_a", how long will it take for the wire to drop to temperature "T", if the variable τ (tau) is found to be 0.02 hr ?
The following material properties are given:
k = 224 (BTU-ft/hr-ft2 -o R)
h = 1.65 (BTU/hr-ft2 -o R)
cp = 0.091 (BTU/lbm-o R)
rho = 558 (lbm/ft3 )
T_a = 99F
T = 139F
T_0 = 296F

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A copper wire has a diameter "d" is heated by a short circuit to "T_0" before a slow-blow fuse burns...