Conduction: Two metal rods, one silver and the other copper, are both immersed at one end in a steam chamber at a temperature of 100°C. The other end of each one is in an ice water bath at 0°C. The rods are 5.0 cm long and have a square cross-section that is 2.0 cm on a side. No heat is exchanged between the rods and the surroundings, except at the ends. How much total heat flows through the two rods each minute? The thermal conductivity of silver is 417 W/m ? K, and that of copper is 395 W/m ? K.
A. 20 kJ
B. 39 kJ
C. 47 kJ
D. 49 kJ
E. 11 kJ
Answer: B
You might also like to view...
Air is flowing through a rocket nozzle. Inside the rocket the air has a density of 5.25 kg/m3 and a speed of 1.20 m/s
The interior diameter of the rocket is 15.0 cm. At the nozzle exit, the diameter is 2.50 cm and the density is 1.29 kg/m3. What is the speed of the air when it leaves the nozzle? A) 176 m/s B) 123 m/s C) 88.0 m/s D) 45.7 m/s E) 29.3 m/s
When two or more capacitors are connected in series across a potential difference
A) the equivalent capacitance of the combination is less than the capacitance of any of the capacitors. B) the potential difference across the combination is the algebraic sum of the potential differences across the individual capacitors. C) each capacitor carries the same amount of charge. D) All of the above choices are correct. E) None of the above choices are correct.
Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. Sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. Which one, if either is correct?
a. Beryl, because low thermal conductivity results in low heat transfer. b. Beryl, because low thermal conductivity results in high heat transfer. c. Sapphire, because low thermal conductivity results in low heat transfer. d. Sapphire, because low thermal conductivity results in high heat transfer. e. Neither, because low heat transfer is desirable both in summer and in winter.
If you took a Ferris wheel ride in space while sitting on a bathroom scale, your weight
A. would increase and decrease just as on Earth. B. would be constant and larger than zero for the entire ride. C. would start large and continually decrease. D. would start small and continually increase. E. would be zero for the entire ride.