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Jul9-07, 11:30 AM
- 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
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