Water Flows Through a Horizontal Pipe of Cross-Sectional Area 10

Multiple Choice

Water flows through a horizontal pipe of cross-sectional area 10. cm² at a pressure of 0.25 atm. The flow rate is 1.0 L/s. At a valve, the effective cross-sectional area of the pipe is reduced to 5.0 cm². What is the pressure at the valve?

A) 0.112 atm
B) 0.235 atm
C) 0.200 atm
D) 7.7 × 10³ Pa
E) 0.157 atm