Physics
When milk is churned, the cream separates from it due to:

Viscous forces
Gravitational force
Frictional force
Centrifugal force

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Physics
A tank filled partially with a liquid is subjected to a uniform horizontal acceleration. Which of the following is true for the surface of liquid in the tank?

The liquid surface falls down only at the center of the tank
The liquid surface falls down on the direction of motion and rises up on the back side of the tank
None
The surface of the liquid remains horizontal

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Physics
The Hooke's law is valid for

Only proportional region of the stress strain curve
Entire elastic region of the stress strain curve
Elastic as well as plastic region of the stress strain curve
Entire stress strain curve

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