Physics
What is the change in the angular momentum of a system as per the Law of Conservation of Angular momentum, if the total external torque acting is zero?

Becomes zero
Remains constant
Increases exponentially
None of these

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Physics
A stone floor feels cold to the bare feet but a carpet on the same floor feels warm. This is because

The human body maintains a constant temperature
The stone conveys the heat away from the feet more rapidly than the carpet
The carpet is a better conductor of heat than the stone
The floor and carpet are at different temperatures

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