ME 211 Homework 10 Solutions - Problem#114.5...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
ME 211 Homework Set #10 Solutions 11‐14‐2008 Problem #1 14.5 Two hemispheres having an inner radius of 2ft and wall thickness of 0.25in. are fitted together, and the inside gauge pressure is reduced to ‐10psi. If the coefficient of static firction is μ s =0.5 between the hemsipheres, determine (a) the torque T needed to initiate the roation of the otp hemisphere relative to the bottom one, (b) the vertical force needed to pull the top hemisphere off the bottom one, and (c) the horizontal force needed to slide the top hemisphere off the bottom one. 1.) Draw the FBD and break the piece down into parts of which you can find the area and the centroid.
Image of page 1

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

View Full Document Right Arrow Icon
2.) Determine the normal force 3.) Determine the force of friction Part(a) – The required torque: In order to initiate rotation of the two hemispheres relative to each other, the torque must overcome the moment produced by the friction force about the center of the sphere. T = F f r = 2880 π (2 + 0.125/12) = 18190 lb * ft = 18.2 kip * ft Part(b) – The required vertical force: In order to just pull the two hemispheres apart, the vertical force P must overcome the normal force.
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.
  • Fall '07
  • ?
  • vy, Rear wheel drive vehicles, Apressurevesselheadisfabricatedbygluingthecircularplatetotheendofthe vesselasshown.Ifthevesselsustainsaninternalpressureof450kPa,determine theaverageshearstressintheglueandthestateofstressinthewallofthevessel, Thechimneyissubjectedtotheuniformwindpressureofp=25lb/ft^2.Itistobe constructedwith1=ft=thickbrickwalls.Ifthebricksandmortarhaveaspecific weightof145lb/ft^3,determinethesmallestouterdiameterdofthechimneyso

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern