what do you think you know about physics, physics is the study of matter under the effect of energy, but does this includes solid states bodies, atoms at ground states, object at microscopic size or object moving faster than light? these and more is what prompt me to ask again what is physics?
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why dont we include the mass of an atom's electrons in the atomic mass
it is
negligible, about 1840 time lighter than a proton, therefore adding it will not
add any significant amountto the mass.
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