1. Determine the steady-state surface temperature of an electric cable, 25 cm in diameter, which is.

1. Determine the steady-state surface
temperature of an electric cable, 25 cm in diameter, which is suspended
horizontally in still air in which heat is dissipated by the cable at a rate of
27 W per meter of length. The air temperature is 30C.

2. Determine the required time for the
rubber balls described in Problem 20.8 to reach the condition such that the
center temperature is 320 K. What will be the surface temperature when the
center temperature reaches 320 K?

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