Physics
What is the unit of the physical quantity "Jerk"?

Meter second
Meter per second cube
Meter per second square
Meter per second

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Physics
Siphon will fail to work if:

The densities of the liquid in the two vessels are equal.
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.

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