Physics
A single fixed pulley is used to draw water from a well because

Efficiency is 100%
Force is applied in a convenient direction
Mechanical advantage is high
Velocity ratio is low

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Physics
Solar eclipse will take place when

the moon does not lie on the line joining the sun and the earth
the sun is between the moon and the earth
the earth is between the moon and the sun
the moon is between the sun and the earth

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