PART B IS REALLY IMPORTANT$14-69$ A $2\mathrm{.}4-$m$-$diameter tank is initially filled with water

$4m$ above the center of a sharp$-$edged $10-$cm$-$diameter

orifice. The tank water surface is open to the atmosphere,

and the orifice drains to the atmosphere. Neglecting the

effect of the kinetic energy correction factor, calculate

$($a$)$ the initial velocity from the tank and $($b$)$ the time

required to empty the tank. Does the loss coefficient of

the orifice cause a significant increase in the draining

time of the tank?

a$)7\mathrm{.}23\frac{m}{s}$

b$)637s$