Physics
Formula for distance is

Speed x time
Speed x acceleration
Velocity / speed
Time / speed

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Physics
The wall of a dam is broader at the base

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

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Physics
A dynamo is used to convert

Electrical energy into mechanical energy
Magnetic energy into mechanical energy
Mechanical energy into electrical energy
Electrical energy into magnetic energy

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