Question

# A cylinder of height $$20\ m$$ is completely filled with water. The velocity of efflux of water ( in $$ms ^{ -1 }$$) through a small hole on the side wall of the cylinder near its bottom, is-

A
10
B
20
C
25.5
D
5

Solution

## The correct option is B $$20$$Applying Bervoulli's theorem at $$(1)$$ & $$(2)$$$$\dfrac{P_1}{pg}+\dfrac{V^2_{1}}{2g}+h_1$$$$=\dfrac{P^2}{Pg}+\dfrac{V^2_2}{2g}+h_2$$$$P_1=P_2$$ & $$V_1=0$$Thus, $$V^2_2=2g(h_1-h_2)$$$$V^2_2=2(10)(20)$$$$V_2=20$$ m/s.Physics

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