PHYS 101 Lecture 9: Examples (1)
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Bernoulli"s equation example ie. water flows with a speed of 5. 0 m/s through a section of a pipe that is lying on the ground. The gauge pressure in the pipe is 75 kpa and the diameter of the hose is 3. 0 cm. It then enters a section of the pipe that is 2. 0 m above the ground level and has a diameter of 2. 0 cm. 75000 + (1000)(5)2 + (1000)(9. 8)(0) = p2 + (1000)(11. 25)2 + (1000)(9. 8)(2. 0) P2 = 4618. 75 pa = 4. 6 kpa decrease in pressure. 2 + gh ie. fluid is forced out of a spray bottle by blowing fast moving air through a nozzle, as shown in the figure. Assume that the rate at which the fluid level drops in the bottle is negligible. Po + (1000)(0)2 + (1000)(9. 8)(0) = po + ( air)(9. 8)vair. 2 + gh = p2 + v2.
