Physics
Hydraulic machines work under the Principle of :

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

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Physics
Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)

The gold piece will weigh more
Weighing will depend on their masses
The silver piece will weigh more
Both silver and gold pieces weigh equal

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