Physics

Problem

Two cylindrical rods, X and Y, each

0.50\,\text{m}

long, join heat reservoirs whose temperatures differ by

40\,\text{K}

. Data: • Rod X: copper,

k = 390\,\text{W}\,\text{m}^{-1}\,\text{K}^{-1}

, cross-sectional area

1.0\times10^{-4}\,\text{m}^2

• Rod Y: aluminium,

k = 200\,\text{W}\,\text{m}^{-1}\,\text{K}^{-1}

, cross-sectional area

2.0\times10^{-4}\,\text{m}^2

Ignoring any losses, which statement about the rates of heat flow through the two rods is correct? a) Heat flow through rod Y is about twice that through rod X. b) Heat flow is greater through rod Y only. c) Heat flow is greater through rod X only. d) Heat flow is equal in both rods.

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