Physics
According to special theory of relativity the mass of a particle

Is independent of its velocity.
Decreases with decrease in velocity.
Decreases with increase in velocity.
Increases with increase in velocity with respect to an observer.

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

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