Physics
An egg sinks in soft water but floats in a concentrated solution of salt because

Egg absorbs salt from the solution and expands
Albumin dissolves in salt solution and egg becomes lighter
The density of salt solution exceeds the density of eggs
Water has high surface tension

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Physics
Acceleration is

Inversely proportional to mass
Inversely proportional to force
Directly proportional to force
Directly proportional to mass

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