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sdas [7]
2 years ago
9

Which are true statements?

Physics
1 answer:
Natalka [10]2 years ago
6 0
A. 1 mol is 6.02 × 10^23 of something.

C. The mass of 1 mol is the same as the atomic mass in grams.
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Answer:

v = √2G M_{earth} / R

Explanation:

For this problem we use energy conservation, the energy initiated is potential and kinetic and the final energy is only potential (infinite r)

        Eo = K + U = ½ m1 v² - G m1 m2 / r1

        Ef = - G m1 m2 / r2

When the body is at a distance R> Re, for the furthest point (r2) let's call it Rinf

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       ½ m1v² - G m1 M_{earth} / R = - G m1 M_{earth} / R

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If we do Rinf = infinity     1 / Rinf = 0

       v = √2G M_{earth} / R

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The mechanical energy is conserved  

 

      Em = -G m1  M_{earth} / R

      Em = - G m1  M_{earth} / R

     R = int        ⇒  Em = 0

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..........................................................

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