Physics
Why does a cannon recoil after firing ?

Conservation of energy
Newton's first law of motion
Backward thrust of gases produced
Newton's third law of motion

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Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

mercury is a metal.
cohesion of mercury is greater than its adhesion with glass.
cohesion of water is greater than its adhesion with glass.
density of mercury is greater than that of water.

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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 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
To allow the heat to get into the food through the hole

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