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2 years ago

7

Help please, this is unit about work, power, force in physics.

1 answer:

bearhunter [10]2 years ago

5 0

1 to 4 5 throu the 7 to 9 and then others are obviously to the 6 and 8

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3 years ago

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Air passing over an airplane's wing travels ____________________, and therefore exerts ____________________ pressure than air tr

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3 years ago

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A heat source could be considered a source of pollution Please select the best answer from the choices provided

jeyben [28]

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2 years ago

What's the difference between mechanical waves and vibrations

OlgaM077 [116]

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3 years ago

If the humidity in a room of volume 410 m3 at 25 ∘C is 70%, what mass of water can still evaporate from an open pan? Express you

Keith_Richards [23]

Answer:

$m=1864.68\ g$

Explanation:

Given:

volume of air in the room, $V=410\ m^3$

temperature of the room, $T=25+273=298\ K$

<u>Saturation water vapor pressure at any temperature T K is given as:</u>

<u /> $p_{sw}=\frac{e^{(77.3450 + 0.0057\times T - \frac{ 7235}{T} )}}{T^{8.2}}$ <u />

putting T=298 K we have

$p_{sw}=3130\ Pa$

<u>The no. of moles of water molecules that this volume of air can hold is:</u>

Using Ideal gas law,

$P.V=n.R.T$

$n=\frac{P_{sw}.V}{R.T}$

$n=\frac{3130\times 410}{8.314\times 298}$

$n=518\ moles$ is the maximum capacity of the given volume of air to hold the moisture.

Currently we have 80% of n, so the mass of 20% of n:

$m=(20\%\ of\ n)\times M}$

where;

M= molecular mass of water

$m=0.2\times 518\times 18$

$m=1864.68\ g$ is the mass of water that can vaporize further.

3 0

2 years ago