Discussion-20 - Hydrodynamics Hydrodynamics Discussion#20...

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ydrodynamics Hydrodynamics Discussion #20 – Ch. 11.7 & 11.10 Physics 125–Fall 2010 Dr. Mike Melnichuk mmeln@umich.edu Office: 2409 Randall Lab phys125lecture@umich.edu ffice Hours: 2:00 :00 / Mon & Tue Rm 1416 Randall Lab Office Hours: 2:00 – 4:00 / Mon. & Tue. in Rm. 1416 Randall Lab.
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Example #1 As part of a lubricating system for heavy machinery, oil of density 850 kg/m 3 is pumped through a cylindrical pipe of diameter 8.0 cm at a rate of 9.5×10 3 cm 3 per second. What is the volume and mass flow rate and the speed of the oil. 3 3 Volume Flow Rate: 9.5 10 m Q p s Mass Flow Rate: 8.1 kg Q s ρ = m 1.9 Qm QA vv As =⇒ = =
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Test #1 If the pipe diameter is reduced to 4.0 cm, what are the new values of volume flow rate and the speed ? Assume that the oil is ideal (incompressible and no turbulence). A. same Q, v = 3.2 m/s B. same Q, v = 6.1 m/s C. same Q, v = 7.6 m/s D. same Q, v = 12 m/s Q 1 5 / E. same Q, v = 15 m/s
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Example #2 As shown in the figure below, water goes into a 3 cm diameter nozzle from a 9 cm
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Discussion-20 - Hydrodynamics Hydrodynamics Discussion#20...

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