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A cylinderical shaped metal rod is used to conduct heat. When the temperature at one end is 100 degree Celsius and at the other end is 20 degree Celsius, heat is transferred at a rate of 16 J/s. The rod is then stretched uniformly to twice its original length. If again it has ends at 100 degree Celsius and 20 degree Celsius, at what rate will heat be transferred between it ends?

The answers that are given to me are:
4 J/s
8 J/s
32 J/s
2 J/s
64 J/s
16 J/s
1 J/s

2006-12-01 12:36:41 · 2 answers · asked by mastersource2005 5 in Science & Mathematics Engineering

2 answers

I would think 4 J/s, since its cross-section is halved and its length is doubled having an overall effect of factor 4.

2006-12-01 12:41:58 · answer #1 · answered by Sjors d 2 · 0 0

Thermal conductivity is expressed in units of W/m-K

Since the rod's volume is constant, if the length is doubled, the cross-sectional area is halved.

2006-12-01 14:52:33 · answer #2 · answered by arbiter007 6 · 0 0

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