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Homework Help: Ask for homework

  1. Jul 9, 2007 #1
    - A hydrometer is to be constructed with a cylindrical floating rod. Nine fiduciary marks are to be placed along the rod to indicate densities of 0.98 g/cm3, 1.00 g/cm3 ,1.02 g/cm3, 1.04 g/cm3, . . . 1.14 g/cm3 . the row of marks is to start 0.200 cm from the top end of the rod and end 1.80 cm. from the top end .
    a). What is the required length of the rod?
    b). What must be its average density ?
    c). Should the marks be equally spaced ?
    Explain your answer.

    -Water is forced out of a fire extinguisher by air pressure. How much gauge air pressure in the tank (above atmosphere) is required for the water jet to have speed of 30.0 m/s when the water level in the tank is 0.500 m. below
    the nozzle ?
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
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