A long aluminium rod ( ) of cross-sectional area conducts a steady heat current of

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Thermodynamics · Thermodynamics

Problem

40\,\text{cm}

long aluminium rod (

k = 205\,\text{W}\,\text{m}^{-1}\,\text{K}^{-1}

) of cross-sectional area

2\,\text{cm}^2

conducts a steady heat current of

20\,\text{W}

. If the hot end is at

150^{\circ}\text{C}

, find the temperature of the cold end. (a)

45^{\circ}\text{C}

(b)

-45^{\circ}\text{C}

(c)

148^{\circ}\text{C}

(d)

130^{\circ}\text{C}