4. A 100 mm diameter cylindrical rod has a uniform internal heat generation of q, = 7*107 W/m³. With steady-state conditions, the equation for the temperature distribution is T(r) = a + br², where T...

Extracted text: 4. A 100 mm diameter cylindrical rod has a uniform internal heat generation of q, = 7*107 W/m³. With steady-state conditions, the equation for the temperature distribution is T(r) = a + br², where T is in Celsius, r is in meters, a = 900°C, and b = -5.40*105 °C/m². The rod properties are k=25 W/(m K), density= 1100 kg/m³, and cp = 750 J/(kg K). (a) What is the heat transferred (in Watts) at r=0 (centerline) and r=r, (outer surface) if the rod is 3 m long? (b) The heat generation is increased to ġ2 =1*109 W/m³. At t=0, what is the time rate of temperature change () evaluated at r=0 and r=r,?