There is a hole in the bottom of tank having water. If total pressure at bottom is 3 atm (1 atm=105 N/m2) , then the velocity of water flowing from hole is:

Pressure at the bottom of tank P=D=3×105 N/m2= Atmospheric pressure + Pressure of liquid columns=P0+hρg Pressure due to liquid column = Pressure difference between bottom and topP−P0=P1=3×105−1×105=2×105=hρg And velocity of water, v=2gh or v=2P1ρ=2×2×105103=400m/s