Physics
The first law of thermodynamics is simply the case of

Charle's law
The law of heat exchange
The law of conservation of energy
Newton's law of cooling

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Physics
A boy is swinging a ball attached to a string in a horizontal circle. If the string snaps

None of these
The ball will travel towards the center of the circle and fall down
It will fall down at the same place where the string breaks
It will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down

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