Physics
The base of an electric iron is brightly polished mainly

To reduce heat loss by radiation
To make it smooth and frictionless
To make it rust-proof
To make it more durable

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Physics
The sensation of weightlessness in a spacecraft in an orbit is due to the

Acceleration in the orbit which is equal to the acceleration due to gravity outside
Fact that spacecraft in the orbit has no energy
Absence of gravity outside
Presence of gravity outside but not inside the spacecraft

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