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belka [17]
3 years ago
13

1 Point

Physics
1 answer:
Margarita [4]3 years ago
7 0

Answer: C

Combustion

Explanation:

Oxygen support combustion in a chemical reaction. Oxygen support burning.

In the absence of oxygen, combustion reaction can never take place. And when the supply of oxygen is being cut off, combustion reaction will automatically stop.

The correct option is C which is combustion

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Suppose you wanted to hold up an electron against the force of gravity by the attraction of a fixed proton some distance above i
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The value is  r =  5.077 \  m

Explanation:

From the question we are told that

   The  Coulomb constant is  k =  9.0 *10^{9} \  N\cdot  m^2  /C^2

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    The  mass of proton m_{proton} =  1.67*10^{-27} \  kg

    The  mass of  electron is  m_{electron } =  9.11 *10^{-31} \ kg

Generally for the electron to be held up by the force gravity

   Then    

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i.e  

            m_{electron} *  g  = \frac{ k *  e^2  }{r^2 }

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