Physics
The velocity required to place a vehicle in orbit around the moon is ________ that required to place it in orbit round the earth.

Equal to
Greater than or equal to
Less than
Greater than

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Physics
Which of the following options correctly explains the term heat budget?

It is the balance between incoming and outgoing radiation
It is the radiation from the earth in the form of long waves.
It is a mode of transfer of heat through matter by molecular activity.
It is the amount of heat which the surface of earth receives from the sun.

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