(Solved): 10.65 Water flows from a tank through a 2.6-m length of galvanized iron pipe 26 mm in diameter. At t ...

10.65 Water flows from a tank through a

length of galvanized iron pipe 26 mm in diameter. At the end of the pipe is an angle valve that is wide open. The tank is 2 m in diameter. Calculate the time required for the level in the tank to change from 10 m to 2 m . Hint: Develop an equation for

where

is the level and

if time. Then solve this equation numerically.