Water Flows Through a Horizontal Pipe of Cross-Sectional Area $10.0 \mathrm {~cm} ^ { 2 }$

Multiple Choice

Water flows through a horizontal pipe of cross-sectional area $10.0 \mathrm {~cm} ^ { 2 }$ at a pressure of 0.250 atm
with a flow rate is 1.00 L/s. At a valve, the effective cross-sectional area of the pipe is reduced to $5.00 \mathrm {~cm} ^ { 2 }$ What is the pressure at the valve? The density of water is $1000 \mathrm {~kg} / \mathrm { m } ^ { 3 }$ , and treat it as an ideal incompressible fluid.

A) 0.157 atm
B) 0.110 atm
C) 0.200 atm
D) 7700 pa
E) 0.235 atm