A 12 cm diameter cylindrical bar, initially at a uniform temperature o – McqOptions

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1.	A 12 cm diameter cylindrical bar, initially at a uniform temperature of 40 degree Celsius, is placed in a medium at 650 degree Celsius with convective coefficient of 22 W/m² K. Determine the time required for the center to reach 255 degree Celsius. For the material of the bar:Thermal conductivity = 20 W/m KDensity = 580 kg/m³Specific heat = 1050 J/kg K
A.	1234.5 seconds
B.	1973.16 seconds
C.	3487.3 seconds
D.	2896.4 seconds
Answer» C. 3487.3 seconds

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