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CaHeK987 [17]
3 years ago
14

Plz help

Physics
2 answers:
dsp733 years ago
7 0

climate changes

not enough food for everyone

crime rates rising

hope I helped

hodyreva [135]3 years ago
5 0

climate change affects: earths atmosphere

A warming atmosphere affects more than just air temperatures

<u>causes wild weather such as</u>

droughts are becoming more common and intense

rainstorms are also becoming more powerful

it provokes  dangerous floods as well.

<em>×║hope this helps somewhat║×</em>

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Two parallel disks of diameter D 5 0.6 m separated by L 5 0.4 m are located directly on top of each other. Both disks are black
oksian1 [2.3K]

To solve this problem it is necessary to apply the concepts related to the Stefan-Boltzmann law which establishes that a black body emits thermal radiation with a total hemispheric emissive power (W / m²) proportional to the fourth power of its temperature.

Heat flow is obtained as follows:

Q = FA\sigma\Delta T^4

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F =View Factor

A = Cross sectional Area

\sigma = Stefan-Boltzmann constant

T= Temperature

Our values are given as

D = 0.6m

L = 0.4m\\T_1 = 450K\\T_2 = 450K\\T_3 = 300K

The view factor between two coaxial parallel disks would be

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\frac{r_2}{L} = \frac{0.3}{0.4} = 0.75

Then the view factor between base to top surface of the cylinder becomes F_{12} = 0.26. From the summation rule

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Then the net rate of radiation heat transfer from the disks to the environment is calculated as

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5 0
3 years ago
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