1) Consider a tank containing 1 m³ of water at 20 °C. The tank is perfectly insulated. There are two copper rods, which each have one end in the water and the other in a reservoir at a different temperature. The first rod is 1 m long and 0.1 m in diameter, and its other end is in a reservoir of liquid nitrogen at 77 K. The second rod is 0.5 m long and 0.05 m in diameter, and its other end is connected to a reservoir at 120 °C. After some time the water in the tank freezes. What is the temperature of the ice in the tank when it finally reaches steady state? [kcu = 400 W m²¹ K-¹] a) 0 °C b) -20 °C c) - 50 °C d) - 70 °C e) - 90 °C

1) Consider a tank containing 1 m³ of water at 20 °C. The tank is perfectly insulated. There are two copper rods, which each have one end in the water and the other in a reservoir at a different temperature. The first rod is 1 m long and 0.1 m in diameter, and its other end is in a reservoir of liquid nitrogen at 77 K. The second rod is 0.5 m long and 0.05 m in diameter, and its other end is connected to a reservoir at 120 °C. After some time the water in the tank freezes. What is the temperature of the ice in the tank when it finally reaches steady state? [kcu = 400 W m²¹ K-¹] a) 0 °C b) -20 °C c) - 50 °C d) - 70 °C e) - 90 °C

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

First law of Thermodynamics

The word thermodynamics consists of two words: thermo- and dynamics. Dynamics means the study of motion. The field of thermodynamics is all about the study of the movement of heat. In a more meaningful way, it is stated as the study of the transfer of energy. Energy transfer is something that we encounter in day-to-day life. Automobiles, chemical reactions, refrigerators, and power generators work on the basis of thermodynamic principles.

Question

1) Consider a tank containing 1 m³ of water at 20 °C. The tank is perfectly insulated. There
are two copper rods, which each have one end in the water and the other in a reservoir
at a different temperature. The first rod is 1 m long and 0.1 m in diameter, and its other
end is in a reservoir of liquid nitrogen at 77 K. The second rod is 0.5 m long and 0.05 m
in diameter, and its other end is connected to a reservoir at 120 °C. After some time the
water in the tank freezes. What is the temperature of the ice in the tank when it finally
reaches steady state? [kcu = 400 W m-¹ K-¹]
a) 0 °C
b) -20 °C
c) - 50 °C
d) - 70 °C
e) - 90 °C

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