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11 October, 17:00

Use Bernoulli's Equation to find out how fast water leaves an opening in a water tank. The water level is 0.75 m above the opening. The top of the water tank is opened to the atmosphere.

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  1. 11 October, 20:50
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    3.84 m/s

    Explanation:

    Using Bernoulli's equation below:

    P1 + (1/2ρv1²) + h1ρg = P2 + (1/2ρv2²) + h2ρg

    where P1 = P2 atmospheric pressure

    (1/2ρv1²) + h1ρg = (1/2ρv2²) + h2pg

    collect the like terms

    h1ρg - h2ρg = (1/2ρv2²) - (1/2ρv1²)

    factorize the expression by removing the like terms on both sides

    gρ (h1 - h2) = 1/2ρ (v2² - v1²)

    divide both side by rho (density in kg/m³, ρ)

    g (h1 - h2) = 1/2 (v2² - v1²)

    assuming the surface of the tank is large and the speed of water then at the tank surface v1 = 0

    2g (h1 - h2) = v2²

    take the square root of both side and h1 - h2 is the difference between the surface of the tank and the opening where water is coming out in meters

    √2g (h1 - h2) = √ v2²

    v2 = √2g (h1-h2) = √ 2 * 9.81*0.75 = 3.84 m/s
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