1. A copper rod is 0.50 m long and has a cross-sectional area of 4.0×10-4m². One end of therod is kept at 30 °C, while the other end is at 75 °C. The sides of the rod are insulated so thatheat losses through the sides are negligible. (a) Find how much heat flows through the rodper second. (b) What is the temperature at 0.30m from the higher-temperature end of therod? The thermal conductivity of copper is 390'lsm °C:

Answered: Image /qna-images/answer/3cf5bd4f-574b-4931-b055-144388b7ee8c.jpg

Answered: 1. A copper rod is 0.50 m long and has…

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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2. One side of a copper block 4 cm thick is maintained at 175-C. The other side is covered with a layer of fiberglass 1.5 cm thick. The outside of the fiberglass is maintained at 80 C, and the total heat flow through the composite slab is 300 W. What is the area of the slab?
3. A cylindrical pipe of negligible thickness holding a hot fluid at 140°C and having an outer diameter of 0.4 m is insulated with three layers of each 70 mm thick insulation of K₁ = 0.02: k2 = 0.06 and k3= 0.16 W/m-K (starting from inside). The outside surface temperature is 30°C. Solve for the value of T2.
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ANS : Q=114.93W/m
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Exercise 2.3:Assume that the thermal conductivity of copper is four times that of brass. Two metalrods made of copper and brass are each 20 cm long and 2.0 cm in diameter. The rods are placed end to end. The free end of the copper rod is maintained at 1000C and the free end of the brass rod is maintained at 00C. (i) What is the equilibrium temperature at the copper-brass junction? |(ii)If the thermal conductivity of copper is 390 J/m0C, at what rate, in watts, does heat flow through the rods

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