Physics
Hydraulic machines work under the Principle of :

Pascal's Law
Joules Law
Newton's Law
Floatation Law

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Physics
What is the principle of a ''Life Jacket"?

It provides oxygen to a drowning person
The person can sit on it like a raft
It decreases the volume of the person to keep him afloat
It increases the volume of the person to keep him afloat

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