A long plastic rod of 20-mm diameter (k = 0.3 W/m-K and pc, = 1040 kJ/m3.K) is uniformly heated in an oven as preparation for a pressing operation. For best results, the temperature in the rod should not be less than 200°C. To what uniform temperature, in °C, should the rod be heated in the oven if, for the worst case, the rod sits on a conveyor for 3 min while exposed to convection cooling with ambient air at 25°C and with a convection coefficient of 8 W/m2.K? A further condition for good results is a maximum-minimum temperature difference of less than 10°C. Is this condition satisfied? T; = °C The condition of a maximum-minimum temperature difference of less than 10°C is

A long plastic rod of 20-mm diameter (k = 0.3 W/m-K and pc, = 1040 kJ/m3.K) is uniformly heated in an oven as preparation for a pressing operation. For best results, the temperature in the rod should not be less than 200°C. To what uniform temperature, in °C, should the rod be heated in the oven if, for the worst case, the rod sits on a conveyor for 3 min while exposed to convection cooling with ambient air at 25°C and with a convection coefficient of 8 W/m2.K? A further condition for good results is a maximum-minimum temperature difference of less than 10°C. Is this condition satisfied? T; = °C The condition of a maximum-minimum temperature difference of less than 10°C is

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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Concept explainers

Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.

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A long plastic rod of 20-mm diameter (k = 0.3 W/m-K and pc,
= 1040 kJ/m3.K) is uniformly heated in an oven as preparation for a
pressing operation. For best results, the temperature in the rod should not be less than 200°C. To what uniform temperature, in °C,
should the rod be heated in the oven if, for the worst case, the rod sits on a conveyor for 3 min while exposed to convection cooling
with ambient air at 25°C and with a convection coefficient of 8 W/m2.K? A further condition for good results is a maximum-minimum
temperature difference of less than 10°C. Is this condition satisfied?
T;
i
°C
The condition of a maximum-minimum temperature difference of less than 10°C is

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