A hole is in the bottom of the tank having water. If total pressure at the bottom is 3 atm (1 atm = 10 5 Nm –2 ), then velocity of water flowing from hole is:
A
ms –1
B
ms –1
C
ms –1
D
none of these
Text Solution
Verified by ExpertsThe correct answer is:
A
Let height of water column in the tank be h. Total pressure (p) = atmospheric pressure (p 0 ) +
pressure due to water column in tank (p’)
∴ p’ = p – p 0 = 3 – 1 = 2 atm
or h ρ g = 2 × 10 5
or h × 10 3 × 10 = 2 × 10 5
or h = 20 m
Hence, velocity of water coming from hole ie, velocity of efflux is
v = 
= 
= 
ms –1
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