An iron bar 2.0 cm x 3.0 cm x 10.0 cm at a temperature of 95 °C is dropped into a barrel of water at 25 °C. The barrel is large enough so that the water temperature rises negligibly as the bar cools. The rate at which heat is transferred from the bar to the water is given by the expression Q (J/min) = UA (T,- T) where U 0.05 J/(min cm °C)] is a (cm ) is the exposed surface area of the bar, T, and Tw are the surface temperature of the bar and the water temperature, respectively. The heat capacity of the bar is 0.46 J/(g °C). Heat conduction in iron is rapid enough for the temperature T, to be considered uniform throughout the bar. a) Write an energy balance on the bar b) Plot the expected plot of T, versus t and then curve fitting. n')(7.7 g/cm³) = 462 g M = (60 cm)(7.7 g/cm) = 462 g = 0.46 kJ/(kg. C), T = 25°C M 3D160 ст ст C, U = 0.050 J/(min cm2.C) A = 2[(2(3) + (2)(10) + (3)(10)]em² = 112 cm %3D %3D %3! %3D

An iron bar 2.0 cm x 3.0 cm x 10.0 cm at a temperature of 95 °C is dropped into a barrel of water at 25 °C. The barrel is large enough so that the water temperature rises negligibly as the bar cools. The rate at which heat is transferred from the bar to the water is given by the expression Q (J/min) = UA (T,- T) where U 0.05 J/(min cm °C)] is a (cm ) is the exposed surface area of the bar, T, and Tw are the surface temperature of the bar and the water temperature, respectively. The heat capacity of the bar is 0.46 J/(g °C). Heat conduction in iron is rapid enough for the temperature T, to be considered uniform throughout the bar. a) Write an energy balance on the bar b) Plot the expected plot of T, versus t and then curve fitting. n')(7.7 g/cm³) = 462 g M = (60 cm)(7.7 g/cm) = 462 g = 0.46 kJ/(kg. C), T = 25°C M 3D160 ст ст C, U = 0.050 J/(min cm2.C) A = 2[(2(3) + (2)(10) + (3)(10)]em² = 112 cm %3D %3D %3! %3D

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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