A cylindrical copper rod 37 cm long and 7.5 cm in diameter is placed upright on a hot plat...

A cylindrical copper rod 37 cm long and 7.5 cm in diameter is placed upright on a hot plate held at a constant tempera-tu re of 120 °C, as indicated in Figure 17-31. A small depression on top of the rod holds a 25-g ice cube at an initial temperature of 0.0 °C. How long does it take for the ice cube to melt? Assume there is no heat loss throrigh the vertical surface of the rod, and that the thermal conductivity of copper is 390 W/(m · C°).

FIGURE 17-31