From Bernouli's equation
rho g h1 + 1/2Â Â rho v1^2 = rho g h2 + 1/2 rho
m v2^2,   here v1 = 0, h2 = 0
rho g h1 = 1/2 rho v2^2
v2^2 = 2*g*h1 = 2*9.8*8 = 156.8
v2 = 12.52 m/s
now mass flow rate m/t = rho
*A*VÂ Â Â Â Â Â Â Â Â Â Â Â Â
rho density of water , A area of cross section, V is
speed
                                          Â
= 1000 *3.14*0.01^2*12.52
                                          Â
= 3.931 kg/s
time taken to fill 20 lts of water is 20 / 3.931 = 5.08
s
(treated 1kg of water as 1 ltr)
