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Homework Help: Bernoulli's pressure

  1. Jun 12, 2015 #1
    1. The problem statement, all variables and given/known data
    Calculate pressure outside the box- ATM pressure is 101325 Pa, air moving outside the box is 45 m/s, air density is 1.3 kg/m^3

    2. Relevant equations
    P + 1/2(roe)(v)^2 = Patm

    3. The attempt at a solution
    P + 1/2 (1.3kg/m^3)(45m/s)^2 = 101325 Pa
    P + 1316.25 Pa = 101325 Pa
    P= 100008.75 Pa
  2. jcsd
  3. Jun 13, 2015 #2

    rude man

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    Homework Helper
    Gold Member

    I guess the problem is an open box with static air inside and air blowing over the open end, in which case your computation is right.
    But you need to define problems more fully.
  4. Jun 13, 2015 #3
    Bernoulli's equation is an express of energy conservation. All terms have energy density dimensions and your calculation is correct.
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