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

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

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Physics
Dynamo is a device for converting

Mechanical energy into electrical energy
Heat energy into electrical energy
Chemical energy into electrical energy
Magnetic energy into electrical energy

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