A long 18-cm-diameter bar made of hardwood (k = 0.159 W/m•ºC, α = 1.75×10-7 m2/s) is exposed to air at 30ºC with a heat transfer coefficient of 8.83 W/m2•ºC. If the center temperature of the bar is measured to be 15ºC after a period of 3-hours, the initial temperature of the bar is
(a) 11.9ºC
(b) 4.9ºC
(c) 1.7ºC
(d) 0ºC
(e) -9.2ºC
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