Water from a tap emerges vertically downwards with an initial speed of 1.0 m/s. The cross-sectional area of tap is 10 –4 m 2 . Assume that the pressure is constant throughout and that the flow is steady, the cross-sectional area of stream 0.15 m below the tap is:
Text Solution
Verified by ExpertsC
From conservation of energy
= 
+ 2gh … (1)
[can also be found by applying Bernouilli’s theorem between
1 and 2]
From continuity equation A 1 v 1 = A 2 v 2
v 2 = 
v 1 … (2)
Substituting value of v 2 from Eq. (2) in Eq. (1)
. 
= 
+ 2gh
or 
= 
∴ A 2 = 
Substituting the given values
A 2 = 
A 2 = 5.0 × 10 –5 m 2
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