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Goryan [66]
3 years ago
13

Consider a cubical furnace with a side length of 3 m. The top surface is maintained at 700 K. The base surface has emissivity of

0.90 and is maintained at 950 K. The side surface is black and is maintained at 450 K. Heat is supplied from the base surface at a rate of 340 kW. Determine the emissivity of the top surface and the net rates of heat transfer between the top and bottom surfaces, and between the bottom and side surfaces. Answers: 0.44; 54.4 kW; 285.6 kW

Engineering
1 answer:
Ket [755]3 years ago
8 0

Answer:

Check the explanation

Explanation:

Assumptions.

1. The surfaces are diffuse, may and opaque

2. steady operating conditions exist

3. Heat transfer from and to the surfaces is only due to Radiation  

Consider the base surface to be surface 2 the top surface to be surface and the side surfaces to surface 3 1. cubical furnace can be considered to be three-surface enclosure. the areas and black body emissive powers of surfaces can be calculated as seen in the attached images below.

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A jet aircraft is in level flight at an altitude of 30,000 ft with an airspeed of 500 ft/s. The aircraft has a gross weight of 1
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Answer:

a) attached below

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Explanation:

<u>a) Plot of the drag polar for this aircraft </u>

first we will calculate :

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K = 1 / \pieAR = 1 /

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attached below is a plot of the drag polar

<u />

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6 0
3 years ago
5. What number filter lens is recommended when welding with SMAW and using 1/8" (3.2 mm)
Inessa05 [86]

Answer:

What filter lens is recommended for SMAW?

Table of Filter Lenses for Protection From Radiant Energy

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Explanation:

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Fill in the tables and find the equivalent resistance for the following circuits:
Dafna11 [192]

Answer:

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The atmospheric pressure at the top and the bottom of a building is read by a barometer to be 98.5 kPa and 100 kPa, respectively
Fynjy0 [20]

Answer:

127.42m

Explanation:

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So what we must do to solve this problem is to find the length of the air column above and below the building and then subtract them to find the height of the building, taking into account the above the following equation is inferred

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g=9.81m/s^2

H=\frac{100000-98500}{(9.81)(1.2) }=127.42m

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4 years ago
I’m bored let’s text
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Answer:

<em>hi</em><em> </em><em>sa</em><em>m</em><em>e</em><em> </em><em>here</em><em>.</em><em> </em><em>hru</em><em> </em><em>btw</em>

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3 0
3 years ago
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