Q.

Two rods of same material, cross-section and length are welded end to end. The temperature difference across the ends of the composite rod is 100°C. 1o cal. of heat flows through the combination in 10 min. If the rods are welded side by side, how much time will 10 cal heat take to go across the combination ?

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a

2.5 min

b

5 min

c

15 min

d

20 min

answer is A.

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Detailed Solution

Q=KAΔTdt1=K(2A)ΔT(d/2)t2t2=t1/4=10/4=2⋅5 min
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Two rods of same material, cross-section and length are welded end to end. The temperature difference across the ends of the composite rod is 100°C. 1o cal. of heat flows through the combination in 10 min. If the rods are welded side by side, how much time will 10 cal heat take to go across the combination ?