## A body of mass 2 kg is thrown vertically upwards with an initial

“Assume two electrons (or two protons) are separated by a certain distance. A gravitational force would attract them, while an electric force would repel them. Is there a point where these two powers can strike a balance?”
Oh no! The r2 factors cancel each other out! Is it true that we can’t use this relationship to address the original question (find the value of r)? Let’s “change gears” and approach this issue from a different angle (while mixing metaphors in the process…). Let’s look at the force-to-force ratio:
It’s worth remembering that the r2 factors balance out in this ratio as well. We do, however, get an intriguing outcome. The electric force between two electrons is always 4.1 x 1042 times greater than the gravitational force between them at any distance, according to this estimate!
Protons have a density of 1.7 x 10-27 kilograms. Regardless of the distance between protons, you should be able to demonstrate that the Felec/Fgrav ratio is about 1.2 x 1036. As a consequence, the gravitational force isn’t the force that binds protons together in the atom’s nucleus!

## Astronauts train for final shuttle mission

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