A composite rod consists of a 5.0 cm long segment of aluminum (thermal conductivity…
PHYSICS · Subjective · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter
Problem
A composite rod consists of a 5.0 cm long segment of aluminum (thermal conductivity 205 W/m·°C) joined end-to-end with a 7.0 cm long segment of glass (thermal conductivity 1.1 W/m·°C). Both segments share a circular cross-sectional area of 0.80 cm². The hot end of the aluminum is held at 140 °C, and the opposite end of the glass is in good thermal contact with a 60 g block of lead initially at 20 °C (specific heat 0.13 J/g·°C). After steady-state conduction is established in the rod, determine the temperature of the lead block 45 s after contact begins. Ignore any other heat losses and assume the block remains uniform in temperature.