Physics
When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is

Above a certain minimum value irrespective of amount of water in the pail
Below a certain minimum value depending on amount of water in the pail
Above a certain minimum value depending on amount of water in the pail
Below a certain minimum value irrespective of amount of water in the pail

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

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

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