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if im not mistaken i think its d let me know if correct plz
String the·o·ry
noun
a cosmological theory based on the existence of cosmic strings.
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It is the carrier of genetic information.
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Atoms found in nature are either stable or unstable. ... An atom is unstable (radioactive) if these forces are unbalanced; if the nucleus has an excess of internal energy. Instability of an atom's nucleus may result from an excess of either neutrons or protons
Constant velocity means the netto force = 0, therefore F(gravity) = F(astronaut).
175N divided by 87,5kg = 2.00kg/N
