Physics
The ordinary and maximum tolerance limit of sound by human being is

65 db to 75 db (decibel)
70 db to 85 db (decibel)
60 db to 80 db (decibel)
50 db to 70 db (decibel)

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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

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