Physics
When a barometer reading suddenly recedes, it indicates that climate–

Incessant rain for at least 48
Will be very warm
Will be extremely stormy
Will remain cold

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Physics
Isotopes of an element contain

equal number of protons and electrons
equal number of nucleons
the same number of neutrons but different number of protons
the same number of protons but different number of neutrons

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

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