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Homework Help: Density, force and velocity

  1. Nov 24, 2013 #1
    1. A strong wind of speed 33 m s^–1 blows against a wall. The density of the air is 1.2 kg m^–3. The wall has an area of 12 m^2 at right angles to the wind velocity. The air has its speed reduced to zero when it hits the wall.
    What is the approximate force exerted by the air on the wall?

    2. ρ= m/v. F= m/a

    3. I have no idea how I would do this.
  2. jcsd
  3. Nov 25, 2013 #2
    Welcome to Physics Forums. This is a rate-of-change-of-momentum problem. Do you know how to calculate the rate at which mass strikes the wall (kg/sec)?
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