Suppose that the rod in Fig. 17.23a is made of copper, is 45.0 cm long, and has a cross-sectional area of 1.25 cm2. Let (a) What is the final steady-state temperature gradient along the rod? (b) What is the heat current in the rod in the final steady state? (c) What is the final steady-state temperature at a point in the rod 12.0 cm from its left end?

Solution 63E Problem (a) Step 1: Length of the rod L = 45 cm or 0.45 m 2 4 2 Area of cross section A = 1.25cm or 1.25x10 m Hot temperature T H = 100°C Cold temperature T = 0°C C Thermal conductivity k = 385 W/m.K Cu