Physics
The point where total mass of a body is supposed to be concentrated is known as

Dead centre
Centre of gravity
Centre of mass
Centre of motion

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

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.
It is the balance between incoming and outgoing radiation
It is the radiation from the earth in the form of long waves.

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