Physics
When a running car stops suddenly, the passengers tends to lean forward because of:

Inertia of rest
Centrifugal force
Inertia of motion
Gravitational force

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Physics
Superconductors are those elements

Whose conductivity is intermediate between metals and insulators
Whose resistance falls almost to zero at very low temperatures
Which turn into insulators at very low temperatures
Which conduct electricity only at super-high temperatures

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