Two cylindrical rods, X and Y

PHYSICS · Single correct · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

Two cylindrical rods, X and Y, each 0.50 m0.50\,\text{m} long, join heat reservoirs whose temperatures differ by 40 K40\,\text{K}. Data: • Rod X: copper, k=390 W m−1 K−1k = 390\,\text{W}\,\text{m}^{-1}\,\text{K}^{-1}, cross-sectional area 1.0×10−4 m21.0\times10^{-4}\,\text{m}^2 • Rod Y: aluminium, k=200 W m−1 K−1k = 200\,\text{W}\,\text{m}^{-1}\,\text{K}^{-1}, cross-sectional area 2.0×10−4 m22.0\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.

Related theory

Browse the problem library