A Brass Rod with a Length of 20

question 23

Multiple Choice

A brass rod with a length of 20.0 cm is placed end to end with an aluminum rod with a length of 20.0 cm, and this system is placed between a hot temperature of 100 °C and a cold temperature of 10.0 °C. The thermal conductivities of the brass and the aluminum are 100 W/m °C and 230 W/m °C, respectively. The rods have the same cross-sectional area of 25.0 cm². What is the heat flow from the hot temperature to the cold temperature?

• A) 78.4 W
• B) 70.2 W
• C) 65.3 W
• D) 61.5 W
• E) 55.5 W

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