# physics

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Water flows through a horizontal tube of diameter 2.9cm that is joined to a second horizontal tube of diameter 1.5 cm. The pressure difference between the tubes is 7.2 kPa.

A)Find the speed of flow in the first tube.

• physics -

Data
d1=2.9cm
d2=1.5cm
dP=7.2kPa
required, V1=?
from,
A1V1=A2V2
Hence
A1/A2=V2/V1
A1=V2
A2=V1
hence
A2=((3.14*1.5*1.5)/(4))
A2=1.77cm2=V1
V1=1.77cm/s

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