1.

If heat conducted into the element at plane x is Q X = k A C (d t/d x) X. Then heat conducted out of the element at plane (x + d x) is

A. 2k A <sub>C</sub> d/d x (t + d t/d x (d x))
B. k A <sub>C</sub> d/d x (t + d t/d x (d x))
C. 3k A <sub>C</sub> d/d x (t + d t/d x (d x))
D. 4k A <sub>C</sub> d/d x (t + d t/d x (d x))
Answer» C. 3k A <sub>C</sub> d/d x (t + d t/d x (d x))


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