The reason an astronaut in an earth satellite feels weightless is thatThe reason an astronaut in an earth satellite feels weight
2 answers:
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1) First of all, let's calculate the potential difference between the initial point (infinite) and the final point (d=0.529x10-10 m) of the electron.
This is given by:
Where E is the electric field generated by the proton, which is
where
is the Coulomb constant and 
is the proton charge.
Replacing the electric field formula inside the integral, we obtain
2) Then, we can calculate the work done by the electric field to move the electron (charge
) through this 
. The work is given by
This is given by:
Where E is the electric field generated by the proton, which is
where
Replacing the electric field formula inside the integral, we obtain
2) Then, we can calculate the work done by the electric field to move the electron (charge