posted by Jiskhaa .
Calculate the number of litres of water delivered per minute by a pipe with cross-sectional area 15 square centimetres, if the water passes through the pipe at an average speed of 30cm/s (second)
P.S. Working out please
think about it.
each second, a 30cm tall cylinder of water passes through the pipe
v = base * height
15cm^2 * 30 cm/s = 450 cm^3/s * 60s/min = 27000 cm^3/min = 27L/min