What is the correct unsteady forward-difference heat conduction equation of node 6 of the rectangular solid shown in Fig. P5–152 if its temperature at the previous time (Δt) is T₆*?

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(a) Τό + 1 = [ΚΔt / (pc,Δ?)](T + T + T + T%) + [1 – 4k_t Κρε,Δ?)]T (b) Tj + 1 = [k_t / (pcΔ?)](T + T + T + T%) + [1 – kΔΙ /ρς,Δ3)]Τ 1 (c) Tj + 1 = [ΚΔt / (pC,Δ2)](T + T + T + T%) + [2kΔ! (pc,Δ2)]T*% * (d) Tj + 1 = [2k_t / (pCΔ?)](T + T + T + T%) + [1 – 2kΔt /(pc,Δ2)]Τ - (e) Tj + 1 = [2k_t / (pc,Δ?)](T + T + T + T%) + [1 – 4k_t /pCpd?)]T 2 1 5 |Δx = Δy =Δ 6 10 3 7 11 +4 8 12