A large concrete slab 1 m thick has one-dimensional temperature distribution: T = 4 - 10x + 20x2 + 10x3, where T is temperature and x is the distance from one face towards the other face of the wall. If the slab has a thermal diffusivity of 2 × 10-3 m2/hr, what is the rate of change of temperature at the other face of the wall?

A large concrete slab 1 m thick has one-dimensional temperature distri

1.	A large concrete slab 1 m thick has one-dimensional temperature distribution: T = 4 - 10x + 20x2 + 10x3, where T is temperature and x is the distance from one face towards the other face of the wall. If the slab has a thermal diffusivity of 2 × 10-3 m2/hr, what is the rate of change of temperature at the other face of the wall?
A.	0.1°C/h
B.	0.2°C/h
C.	0.3°C/h
D.	0.4°C/h
Answer» C. 0.3°C/h

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