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Yuri [45]
3 years ago
10

5 Amenazas socio natural ​

Geography
1 answer:
Alja [10]3 years ago
5 0

Answer:

OK mais je n'ai pas du tout compris ta suestion

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Automobile windscreens often develop a fog on the inside of the glass. To remove this fog, most cars have vents under the windsc
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b. hot air on the screen

Explanation:

Switching on the heater or turning down the AC in the car or opening the windows to let in natural air will help warm the windows to be above dew point.

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Islam, Judaism, and Christianity have shared historical origins. Please select the best answer from the choices provided.
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True they all share the belief that there religon started with Jerusalem or has huge significant value in the holy city. 
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While physical weathering Will break a rock into chunks ___ turns to the rock into soil
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it will turn into sediments.

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Calculate the amount, in grams, of an original 300-gram sample of radioactive isotope Potassium-40 remaining after
Aleksandr [31]

Answer:

The current amount of the Potassium-40 sample is approximately 37.521 grams.

Explanation:

The amount of the sample of the radioactive isotope decays exponentially in time, the amount of mass of the sample as a function of time (m (t)), in grams, is described below:

m(t) = m_{o}\cdot e^{-\frac{t}{\tau} } (1)

Where:

m_{o} - Initial mass, in grams.

t - Time, in years.

\tau - Time constant, in years.

The time constant can be found from half life (t_{1/2}), in years, described in statement:

\tau = \frac{t_{1/2}}{\ln 2} (2)

If we know that m_{o} = 300\,g, t = 3.9\times 10^{9}\,yr and t_{1/2} = 1.3\times 10^{9}\,yr, then the current amount of the sample is:

\tau = \frac{1.3\times 10^{9}\,yr}{\ln 2}

\tau \approx 1.876\times 10^{9}\,yr

m = (300\,g)\cdot e^{-\frac{3.9\times 10^{9}\,yr}{1.876\times 10^{9}\,yr} }

m\approx  37.521\,g

The current amount of the Potassium-40 sample is approximately 37.521 grams.

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3 years ago
Name 3 features of underground water and explain one of them in detail​
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Some of the most typical characteristics of groundwater are weak turbidity, a constant temperature and chemical composition and almost overall absence of oxygen. Circulating groundwater can have extreme variation in the composition with the appearance of pollutants and various contaminants.

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