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Question Number 12499 by tawa last updated on 23/Apr/17

Water flows out of a tank through a hole of diameter 2cm above the hole  (1) Determine the velocity of outflow  (2) The rate of outflow when the level of the water in the tank is 2cm above  the hole.

$$\mathrm{Water}\:\mathrm{flows}\:\mathrm{out}\:\mathrm{of}\:\mathrm{a}\:\mathrm{tank}\:\mathrm{through}\:\mathrm{a}\:\mathrm{hole}\:\mathrm{of}\:\mathrm{diameter}\:\mathrm{2cm}\:\mathrm{above}\:\mathrm{the}\:\mathrm{hole} \\ $$$$\left(\mathrm{1}\right)\:\mathrm{Determine}\:\mathrm{the}\:\mathrm{velocity}\:\mathrm{of}\:\mathrm{outflow} \\ $$$$\left(\mathrm{2}\right)\:\mathrm{The}\:\mathrm{rate}\:\mathrm{of}\:\mathrm{outflow}\:\mathrm{when}\:\mathrm{the}\:\mathrm{level}\:\mathrm{of}\:\mathrm{the}\:\mathrm{water}\:\mathrm{in}\:\mathrm{the}\:\mathrm{tank}\:\mathrm{is}\:\mathrm{2cm}\:\mathrm{above} \\ $$$$\mathrm{the}\:\mathrm{hole}.\: \\ $$

Answered by sandy_suhendra last updated on 24/Apr/17

h=2cm=0.02m  g=9.8m/s^2   D=2cm=0.02m  A=(1/4)πD^2 =(1/4)×3.14×0.02^2 =3.14×10^(−4) m^2        a) v= (√(2gh)) = (√(2×9.8×0.02)) = 0.626 m/s       b) Q = A.v =3.14×10^(−4) ×0.626 = 1.97×10^(−4)  m^3 /s

$$\mathrm{h}=\mathrm{2cm}=\mathrm{0}.\mathrm{02m} \\ $$$$\mathrm{g}=\mathrm{9}.\mathrm{8m}/\mathrm{s}^{\mathrm{2}} \\ $$$$\mathrm{D}=\mathrm{2cm}=\mathrm{0}.\mathrm{02m} \\ $$$$\mathrm{A}=\frac{\mathrm{1}}{\mathrm{4}}\pi\mathrm{D}^{\mathrm{2}} =\frac{\mathrm{1}}{\mathrm{4}}×\mathrm{3}.\mathrm{14}×\mathrm{0}.\mathrm{02}^{\mathrm{2}} =\mathrm{3}.\mathrm{14}×\mathrm{10}^{−\mathrm{4}} \mathrm{m}^{\mathrm{2}} \:\:\:\:\: \\ $$$$\left.\mathrm{a}\right)\:\mathrm{v}=\:\sqrt{\mathrm{2gh}}\:=\:\sqrt{\mathrm{2}×\mathrm{9}.\mathrm{8}×\mathrm{0}.\mathrm{02}}\:=\:\mathrm{0}.\mathrm{626}\:\mathrm{m}/\mathrm{s}\:\:\:\:\: \\ $$$$\left.\mathrm{b}\right)\:\mathrm{Q}\:=\:\mathrm{A}.\mathrm{v}\:=\mathrm{3}.\mathrm{14}×\mathrm{10}^{−\mathrm{4}} ×\mathrm{0}.\mathrm{626}\:=\:\mathrm{1}.\mathrm{97}×\mathrm{10}^{−\mathrm{4}} \:\mathrm{m}^{\mathrm{3}} /\mathrm{s}\:\:\:\:\: \\ $$

Commented by tawa last updated on 24/Apr/17

God bless you sir.

$$\mathrm{God}\:\mathrm{bless}\:\mathrm{you}\:\mathrm{sir}. \\ $$

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