Physics
Frictional force acts in

Upward direction
All the directions
The opposite direction of the motion
The same direction as the motion

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

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