with the
vertical. A student derives the following relation between and 
and checks that
the relation has a correct limit :as 
as
expected. (We are assuming there is no strong wind and that the rainfalls
vertically for a stationary man). Do you think this relation can be correct ?
If not, guess at the correct relation.
Answer:
Since trigonometric functions are
dimensionless,
But
Dimensions of 
Dimensions of
RHS
Hence
the given relation is dimensionally wrong.
This
relation can be corrected by dividing RHS by the speed 'u' of the rainfall. So
the corrected relation is
.
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