Question

Check the correctness of the relations:-
(a).
$v = \sqrt{ \frac{p}{d} }$
where
$p$
is pressure and
$d$
is density.

(b). Rate of flow,
$v = \frac{\pi \: pr {}^{4} }{8nl}$

Please Answer Fast...
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Answer 1

Answer    You might hear the term volume flow rate and think it sounds boring, but volume flow rate keeps you alive. I'll tell you how in a second, but first we should define volume flow rate. The volume flow rate QQQ of a fluid is defined to be the volume of fluid that is passing through a given cross sectional area per unit time. The term cross sectional area is just a fancy term often used to describe the area through which something is flowing, e.g., the circular area inside the dashed line in the diagram below.