Physics
When temperature difference between liquid and its surroundings is doubled, the rate of loss of heat will:

Four times
Remain same
Double
Three times

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Physics
Skating on ice is possible because

The pressure on the ice due to skate raises its melting point
The surface of ice is smooth
The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water
Ice is cold

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