Physics
Which conservation principle is applicable in the case of the motion of a rocket?

Conservation of momentum
Conservation of charge
Conservation of mass
Conservation of energy

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Physics
Siphon will fail to work if:

The level of the liquid in the two vessels are at the same height.
The temperature of the liquids in the two vessels are the same.
Both its limbs are of unequal length.
The densities of the liquid in the two vessels are equal.

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