The temperature distribution at a certain time instant through a 50 cm thick wall is prescribed by the relationT = 300 – 500 x – 100 x2 + 140 x3Where temperature t is in degree Celsius and the distance x in meters has been measured from the hot surface. If thermal conductivity of the wall material is 20 k J/m hr degree, calculate the heat energy stored per unit area of the wall

The temperature distribution at a certain time instant through a 50 c

1.	The temperature distribution at a certain time instant through a 50 cm thick wall is prescribed by the relationT = 300 – 500 x – 100 x2 + 140 x3Where temperature t is in degree Celsius and the distance x in meters has been measured from the hot surface. If thermal conductivity of the wall material is 20 k J/m hr degree, calculate the heat energy stored per unit area of the wall
A.	4100 k J/hr
B.	4200 k J/hr
C.	4300 k J/hr
D.	4400 k J/hr
Answer» B. 4200 k J/hr

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