SP2011_Test1

SP2011_Test1 - 22.381 Undergraduate Mechanical Engineering...

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22.381 Undergraduate Mechanical Engineering – Fluid Mechanics Test 1 :Chapter 1 and 2 Instructor : Prof. D. Willis Name and UMS ID: 1. (35 pts) Concept Questions: Please answer the following concept questions fully, but concisely. Expla- nations for any questions are recommended if you are unsure of your answer. (a) True or False: Liquid viscosity generally decreases as the temperature rises (b) True or False: Wetting liquids have higher surface tension than non-wetting liquids (c) True or False: Helium has negative weight, this is why helium balloons rise (d) True or false: The only place in a fluid where shear stresses exist is at the walls of the flow. (e) What is the difference between a Newtonian and Non-Newtonian Fluid? Give an example of each. (f) Define pressure and describe the molecular basis for pressure in gases. (g) Define shear stress and describe the no slip condition . (h) Give two reasons why air pressure does not change linearly with height in the atmosphere. (i) What is the metacenter, and why is it important in buoyancy problems?
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This note was uploaded on 02/13/2012 for the course ME 22.381 taught by Professor Staff during the Spring '12 term at UMass Lowell.

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SP2011_Test1 - 22.381 Undergraduate Mechanical Engineering...

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