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MIT OCW Physics 17 Online
OpenStudy (anonymous):

Ideal incompressible water flows through a horizontal pipe of cross-sectional area 10.0 cm^2 at a pressure of 0.250 atm with a volume flow rate of 1.00 x 10^-3 m^3/s. At a valve, the effective cross-sectional area of the pipe is reduced to 5.00 cm^2. What is the pressure at the valve?

OpenStudy (surry99):

hint: Bernoulli's equation

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