Physics
The velocity of falling rain drops attains a terminal value because of

Surface tension
Air current
Upward thrust due to air
Viscous force exerted by air

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Physics
The mass defect is the result of what action occurring?

Energy being converted into moles of atoms when neutrons break apart protons
Mass being converted to energy when protons and neutrons bind together in a nucleus
Protons and electrons being attracted to each other
Mass being converted to energy when protons and neutrons break apart in a nucleus

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