physics
posted by mohammad .
Water flows through a 1.2 cm diameter pipe into a 155 L bathtub, which it fills in 8 min.What is the speed of the water in the pipe?

We know our diameter is 1.2cm so our radius is 0.6 cm or 0.006 m. Now we find our volume flow rate, Q. so 155l/8min * 1min/60s *1m^3/1000L = 3.2292*10^4 m^3/s.
Velocity= Volume flow rate/Area
V=Q/A
V= 3.2292*10^4 m^3/s 
sorry. here is complete answer.
We know our diameter is 1.2cm so our radius is 0.6 cm or 0.006 m. Now we find our volume flow rate, Q. so 155l/8min * 1min/60s *1m^3/1000L = 3.2292*10^4 m^3/s.
Velocity= Volume flow rate/Area
V=Q/A
V= 3.2292*10^4 m^3/s/ pie*((6*10^3)^2)
V=2.8 m/s