Physics
When the milk is churned vigorously the cream from it is separated out due to

Gravitational force
Centripetal force
Centrifugal force
Frictional force

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Physics
Energy in reflected light :

Becomes maximum for angle of incidence equal to 45°
Does not depends on the angle of incidence
Increases with the increase in angle
Decreases with the increase in angle of incidence

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