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Nezavi [6.7K]
2 years ago
5

Distance is 80 seconds is 8 what is the average speed?

Physics
1 answer:
True [87]2 years ago
8 0

Answer:

speed =distance /time

speed =80/8

speed =10m/s

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Thermopane window is constructed, using two layers of glass 4.0 mm thick, separated by an air space of 5.0 mm.
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To solve this problem it is necessary to apply the concepts related to rate of thermal conduction

\frac{Q}{t} = \frac{kA\Delta T}{d}

The letter Q represents the amount of heat transferred in a time t, k is the thermal conductivity constant for the material, A is the cross sectional area of the material transferring heat, \Delta T, T is the difference in temperature between one side of the material and the other, and d is the thickness of the material.

The change made between glass and air would be determined by:

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There are two layers of Glass and one layer of Air so the total temperature would be given as,

\Delta T = \Delta T_{glass} +\Delta T_{air} +\Delta T_{glass}

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20\°C = 46.9\Delta T_{glass}

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Finally the rate of heat flow through this windows is given as,

\Delta {Q}{t} = k_{glass}\frac{A}{L_{glass}}\Delta T_{glass}

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\Delta {Q}{t} = 179W

Therefore the correct answer is D. 180W.

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