A golf course sprinkler system discharges water from a horizontal pipe at the ra

Question

A golf course sprinkler system discharges water from a horizontal pipe at the rate of 7200 cm^3 /s. At one point in the pipe, where the radius is 4.00 cm, the water's absolute pressure is 2.40 * 10^5 Pa. At a second point in the pipe, the water passes through a constriction where the radius is 2.00 cm.

What is the water's absolute pressure as it flows through this constriction?

NOTE: 7200cm^3/s = 72 m^3/s...i dont know why all the examples i have seen convert 7200 to 7.2 x 10^-3. that isnt right.

Explanation / Answer

7200 cm^3/s is actually (7.2*10^{-3}m^3/s)

because you have cm^3. Now,

(1cm^3 = (0.01 m)^3 = 10^{-6}m^3)

Thus, (7200 cm^3/s = 7200*10^{-6} = 7.2*10^{-3}m^3/s)

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