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A long 18cm diameter bar made of hardwood

A long 18-cm-diameter bar made of hardwood (k = 0.159 W/m·K, α = 1.75 × 10-7 m2 /s) is exposed to air at 30°C with a heat transfer coefficient of 8.83 W/m2 ·K. If the center temperature of the bar is measured to be 15°C after a period of 3-hours, the initial temperature of the bar is

(a) 11.9°C

(b) 4.9°C

(c) 1.7°C

(d) 0°C

(e) 29.2°C

Jul 23 2020 View more View Less

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