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ivolga24 [154]
3 years ago
9

How many elements occur naturally? A. 2 B. 9 C. 29 D. 92

Physics
2 answers:
iragen [17]3 years ago
7 0
92 elements occur naturally.

Hope this help‼️
Dahasolnce [82]3 years ago
4 0

Answer:

92

Explanation:

have a good day

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Would water molecules in Venus’ atmosphere, whose temperature is 740 K, escape into outer space? A water molecule has a mass tha
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Answer:

The water molecule cannot escape, since the average velocity of the water molecules is less than one sixth of the escape velocity of venus.

Explanation:

The average speed of gas molecules is given by:

v_{rms}=\sqrt{\frac{3RT}{M}}

R is the gas constant, T is the temperature and M the molar mass of the gas.

We know that a water molecule has a mass that is 18 times that of a hydrogen atom:

M_H=1.01*10^{-3}\frac{kg}{mol}\\M_{H2O}=18M_H=0.02\frac{kg}{mol}

So, we have:

v_{rms}=\sqrt{\frac{3(8.314\frac{J}{mol \cdot K})740K}{0.02\frac{kg}{mol}}}\\v_{rms}=960.65\frac{m}{s}*\frac{1km}{1000m}=0.96\frac{km}{s}

The water molecule cannot escape, since the average velocity of the water molecules is less than one sixth of the escape velocity of venus:

10\frac{km}{s}*\frac{1}{6}=1.6\frac{km}{s}\\0.96\frac{km}{s}

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3 years ago
What Is The frequency of an X Ray That had A Wavelength of 1.5* 10^-9
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Here I come and we wanna go home!!!
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What is the difference in light that is refracted compared to the light that is reflected?
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Answer:

Reflection is when light bounces off an object, while refraction is when light bends while passing through an object.

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3 years ago
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A light, a heater, and a hair dryer were all running in the bathroom at the same time. Suddenly, they all turn off. After all, t
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Well depending on what current the heater pulls im going to assume about 13, and 13A for the hair dryer, thats 26A on the 40A circuit.
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One solution to this is not to put such a large heater on the circuit with other appliances. 

Another may be to dry your hair in the dark
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In the simple act of lighting a match, chemical energy stored in the match is transformed into heat and light. What is true abou
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When a match stick is struck, some of the chemical energy is transformed into heat and light and the rest is converted into matter.   A match stick has a lot of chemical energy stored in it. When its struck, It start burning. The chemical energy stored in it is transformed into heat energy and light energy. The rest of it turn into ashes and reaction gases.


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