Physics
Which conservation principle is applicable in the case of the motion of a rocket?

Conservation of charge
Conservation of energy
Conservation of mass
Conservation of momentum

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Physics
We always see the same face of the moon, because

It rotates at the same speed as the earth around the sun
It is smaller than the earth
It takes equal time for revolution around the earth and rotation on its own axis
It revolves on its axis in adirection opposite to that ofthe earth

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