Question

Specific Heat of Gases/Heat Transfer

One end of rod A is placed in a cold reservoir with a temperature of 5.00°C. The other end is held in a hot reservoir at 85.0°C. Rod A has a length L and a radius r. Rod B is made of the same material as rod A and the ends of rod B are placed in the same reservoirs as rod A. Rod B has a length 2L and a radius 2r. What is the ratio of heat flow through rod A to that through rod B? Select all that apply. 2 Submit Request Answer

Answer 1

Rate of Heat flow alpha area/length for rod A implies heat flow alpha A r^2/l for rod B Implies heat flow alpha A (2 r)^2/2 l alpha 2 pi r^2/l ratio = heat flow rate of A/heat flow rate of B = pi R^2/e times l/2 pi R^2 ratio = 1: 2 rightarrow if wrong Implies ratio = 1/2 = 0.5