SP2011_Test1_Sols

SP2011_Test1_Sols - 22.381 Undergraduate Mechanical...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 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 True: As temperature rises, liquids in general become less viscous (b) True or False: Wetting liquids have higher surface tension than non-wetting liquids False: The wetting or non-wetting is a property of the material the fluid droplet is in contact with. Eg. Water and a waxed car, vs. water and metal. (c) True or False: Helium has negative weight, this is why helium balloons rise False: The reason is there is a buoyancy force greater than the weight of the helium and balloon (d) True or false: The only place in a fluid where shear stresses exist is at the walls of the flow. False: Shear stresses may occur anywhere in the flow (e) What is the difference between a Newtonian and Non-Newtonian Fluid? Give an example of each. Newtonian Fluids are special in that the stress-strain rate relationship is linear and has a zero intercept. Non-Newtonian fluids have nonlinear stress-strain rate relationshipsintercept....
View Full Document

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.

Page1 / 4

SP2011_Test1_Sols - 22.381 Undergraduate Mechanical...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online