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Q.

A hole is made at the bottom of the tank filled with water (density = 1000 kgm-3). If the total pressure at the bottom of the tank is three atmospheres (1 atmosphere= 105 Nm-2), then the velocity of efflux is nearest to

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a

400  ms-1

b

200  ms-1

c

600  ms-1

d

500  ms-1

answer is A.

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Detailed Solution

Neglecting gravitational head, difference in pressure energy = difference in kinetic energy∴ 3p0−p0=12ρv2or     v=2p0ρ=2105103=20ms−1 or 400ms−1
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