Air flows at the rate of 1.5 m3/s through a horizontal pipe with a gradually reducing cross-section as shown in the figure. The two cross-sections of the pipe have diameters of 400 mm and 200 mm. Take the air density as 1.2 kg/m3 and and assume inviscid incompressible flow. The change in pressure (p2 - p1) (in kPa) between sections 1 and 2 is

Air flows at the rate of 1.5 m3/s through a horizontal pipe with a gra

1.	Air flows at the rate of 1.5 m3/s through a horizontal pipe with a gradually reducing cross-section as shown in the figure. The two cross-sections of the pipe have diameters of 400 mm and 200 mm. Take the air density as 1.2 kg/m3 and and assume inviscid incompressible flow. The change in pressure (p2 - p1) (in kPa) between sections 1 and 2 is
A.	-1.28
B.	2.56
C.	-2.13
D.	1.28
Answer» B. 2.56