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

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

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Physics
In heating frozen foods in sealed pouches in a microwaves, why do you first poke holes in the pouch?

To allow the heat to get into the food through the hole
To allow the microwaves to get into the food through the holes
To prevent the steam pressure from bursting open the pouch
To allow the aroma of the food to come out through the holes

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