Physics
A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole ?

Increase
Will increase first and then dcrease
Remain constant
Dacrease

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

Presence of gravity outside but not inside the spacecraft
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

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