Three rods each have a heat conductance of 30 W/K. Combinations of one or more o

Question

Three rods each have a heat conductance of 30 W/K. Combinations of one or more of these rods can be used to conduct heat from one temperature to another. the rod combination which results in the largest heat conductance is placing all three rods in series placing all three rods in parallel using just one rod placing two rods in series some other combination the resulting heat conductance is W/K. the rod combination which results In the smallest heat conductance Is placing all three rods in series placing ail three rods In parallel using just one rod placing two rods In series some other combination the resulting heat conductance is W/K. Placing one of the rods in series with the parallel combination of the other two rods will result in a heat conductance of W/K.

Explanation / Answer

1.placing all three rods in parallel,

resultance heat conductance =90

2..placing all three rods in series

resultant in the given configuration = 30*60/(30+60) = 20

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