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

To allow the aroma of the food to come out through the holes
To allow the heat to get into the food through the hole
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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Physics
A cyclist leans inwards when he is negotiating a curve so that

No frictional force may be produced between the wheels and the axle
He may increase his speed
Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.
His weight may be reduced

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