Salamat po boss!Answer - Given that
Head (h) = 4.5 m , volume wate through orifice (V) = 60 ltr , time (t) = 85 sec
horizontal distance travelled by jet (x) = 2.4 m , CVertical distance travelled by jet= 400 mm = 0.4 m
Diameter of orifice (d) = 12.5 mm = 0.0125 m
Discharge (Q) = V / t
= 60 / 85
Q = 0.705 l/sec or 0.705 * 10-3 m3/s
Coefficient of velocity (Cv) for orifice = View attachment 1709827
= View attachment 1709828
Coefficient of velocity (Cv) for orifice = 0.894
Now , Q = area * velocity
= area at vena contracta * CvView attachment 1709829
= Cc * area of orifice * CvView attachment 1709830
Q = Cc * a * CvView attachment 1709831
0.705 * 10-3 = Cc * View attachment 1709832/4 * 0.01252 * 0.894 * View attachment 1709833
On solving , we get
Coefficient of contraction (Cc) for orifice = 0.68423
Coefficient of contraction (Cc) for orifice View attachment 1709834 0.685
= 400 mm = 0.4 m

