Physics
In which of the following cases, kinetic energy is being used in performing work ?

Paddling the bicycle to cover a distance
Rowing a boat in the lake
Wind mill grinding wheat grain
Driving a car to cover a distance

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Physics
Absolute Zero is defined as

At which water boils at 298K
At which liquid Helium boils
At which the volume becomes zero
The temperature at which all molecular motion ceases

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