Physics
A photo-electric cell converts

Mechanical energy to electric energy
Heat energy to mechanical energy
Light energy to chemical energy
Light energy to electrical energy

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Physics
Skating on ice is possible because

The surface of ice is smooth
The pressure on the ice due to skate raises its melting point
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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