Physics
Middle latitude cyclones are fueled by?

Energy from falling precipitation
Air high in the atmosphere
All of these
Polar continental air masses

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Physics
A boy is swinging a ball attached to a string in a horizontal circle. If the string snaps

It will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
The ball will travel towards the center of the circle and fall down
It will fall down at the same place where the string breaks
None of these

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Physics
The wall of a dam is broader at the base

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

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