4. A brass rod 100 mm long and 5 mm in diameter extends horizontally from a casting at 200°C. The rod is in an airenvironment with T=20°C and h=30 W/m²-K. What is the temperature of the rod 25, 50, and 100 mm from the casting?Answer: 156.5°C, 128.9°C, 107.0°CPROPERTIES: Table A-1, Brass (T=110°C): k=133 W/m·K.

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Answered: 4. A brass rod 100 mm long and 5 mm in…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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A fabricated food, in the form of small spherical pellets, is to be frozen in an air-blast freezer. The air-blast freezer isoperating with air at -40°C. The initial product temperatureis 25°C. The pellets have a diameter of 0.5 cm, and the density of the product is 980 kg/m3. The initial freezing temperature is -2.5°C. The latent heat of fusion for this product is 280 kJ/kg. The thermal conductivity of the frozen productis 1.9 W/(m°C). The convective heat transfer coefficient is 50 W/(m2 °C). Calculate the freezing time.
Hi, can you help me to answer this question using the first law of thermodynamics formula to explain this event? On a hot summer day, a student turns his fan on when he leaves his room in themorning. When he returns in the evening will the room be warmer or cooler than theneighborouing rooms ? Explain your answer using the first law of thermodynamics.Assume ALL doors and windows are kept closed.
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3.130 A brass rod 100 mm long and 5 mm in diameter extends horizontally from a casting at 200°C. The rod is in an air environment with T = 20°C and h = 30 W/m²K. What is the temperature of the rod 25, 50, and 100 mm from the casting? 8
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Consider a 26-cm x 31-cm printed circuit board (PCB) that has electronic components on one side. The board is placed in a room at 20°C. The heat loss from the back surface of the board is negligible. Assume that the circuit board dissipates 8 W of power in steady operation. Take the emissivity of the surface of the board to be 0.8 and assume the surrounding surfaces to be at the same temperature as the air in the room. Evaluate air properties at a film temperature of 32.5°C and 1 atm pressure. Given: The properties of air at 1 atm and 32.5°C. k = 0.02067W/m.°C v= 1.631 x 10-5 m2/s Pr = 0.7275, B = 0.003273 K-1
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A 6-cm-diameter steel rod at 38°C is suddenly immersed in a liquid at 93°C with h = 110 W/m²-K. How many minutes will it take for the rod to warm to 88°C and how much energy (in kW/m) will have been absorbed by the rod at that time a) if the rod is Carbon Steel AISI 1010? b) if the rod is Stainless Steel AISI 316?
A thin 100 cm long and 10 cm wide horizontal plate is maintained at a uniform temperature of 150°C in a large tank full of water at 75°C.Estimate the rate of heat to be supplied to the plate to maintain constant plate temperature as heat is dissipated from either side of plate. Don't Chat Gpt and AI .
[2] Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k = 0.78 W/m °C) separated by a 12-mm-wide stagnant air space (k = 0.026 W/m- °C). Determine the steady rate of heat transfer through this double-pane window and the temperature of its inner surface for a day during which the room is maintained at 24°C while the temperature of the outdoors is -5°C. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be h1 = 10 W/m2.°C and h2 = 25 W/m2.°C, and disregard any heat transfer by radiation. Glass 3 12 3 mm Frame a.) Steady rate of heat transfer. А. 318 W B. 214 W C. 114 W D. 321 W b.) Temperature of its inner surface. A. 25°C B. 17.5°C С. 15°С D. 19.2°C
I got t=531.96 seconds is that right
A 6.0 mm thick plate of pure copper has an initial temperature of 90°C. The plate is then suddenly immersed in 20°C water where the heat transfer coefficient is 250 W/m²-K. Show that the plate is lumped, and then find the time required for the plate to achieve a temperature of 40°C.

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