Physics
It is difficult to cook rice

Under a mine
At the sea level
At the top of a mountain
Same anywhere

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Physics
The wall of a dam is broader at the base

To withstand pressure that increases with depth
To withstand pressure that increases in a horizontal plane
To withstand pressure that is increased with atmospheric pressure
Because streamlining is required

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Physics
Conservation of energy refers to the fact that

The entropy of the universe is always increasing
No chemical reaction is 100 percent efficient
Energy cannot be created or destroyed but can be converted from one form to another
If you conserve energy you will not be as tired

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