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I am kind of wondering how likely May 25th will be. The mechanical specifications changed to a new specification this time around and NCEES is looking for engineers to help set the standard for the new exam specifications. Looks like they will be meeting May 19-20th. I wouldn't hold my breath...

No problem, you're welcome. The calculator/radians thing you gotta be careful with. Don't want to live this meme! I am heading to bed (on the east coast). Good luck tomorrow! I hope we both pass!

Also the equation is wrong and it should be u×(4×sin (phi/2)/(phi+sin (phi)) You are missing a 4 (so is NCEES, but it is a typo) see the MERM page 54-20, equation 54.95 in the 13th edition. The numerical value of .864 is right of you use the right equation and have your calculator in the right...

Make sure your calculator is in radian mode.

The friction force is upward on the block (opposite the direction of impending motion) but downward on the clamp (same direction of impending motion). See figure attached from my statics textbook  (Bedford and Fowler). The block in this problem is like the funky shaped object in the figure and...

Spastic, where I think you and the NCEES solution are wrong is that you can't say that the horizontal force on the block is 4.4x the horizontal force in the chain. The reason for this is that the friction force (which is a vertical force) produces a moment in the same direction as the vertical...

Yes, you have it right. As the bar expands due to thermal expansion and compresses the spring, the spring will exert a force on the bar which will cause elastic deformation of the bar and compress the bar.

Katie, I think you are neglecting the deformation of the material/bar. There will be deformation in the material, not just the spring. So they actual change in length of the spring is the thermal expansion minus the deformation of the material  [ FL/(AE) ]. See my solution at the link...

Katie, I also got 1.57 (C) I solved it in a similar manner to what jonjjj describes (Critial Buckling Force is twice the pressure X cylinder area) and used both Euler Curve solution and the parabolic curve solution in Shigley's. The parabolic curve solution yields basically the same result...

One way to look at it might be to try and remember what courses did you have the best professors in? That might make studying the easiest. My professors in fluid mechanics, heat transfer and thermal-fluid system design weren't very good. I did have a fantastic thermo professor. 1 out of 4 would...

I agree that there is definitely a mistake somewhere. From Shigley's Standard Handbook of Machine Design Lead = Pitch X Number of Thread Starts (Eq. 1) Tangent(Lead Angle) = Lead / (PI X Mean Diameter) (Eq. 2) If you solve (Eq. 2) for the lead you get Lead = Tangent(Lead Angle) X PI X Mean...

Ah, I realized as soon as I posted it, I made a mistake and had a minus sign instead of a + and ended up with the same solution you got. I deleted the link above and have the corrected solution here https://www.dropbox.com/s/2knjv1n5okwgb52/20170326_191621.jpg?dl=0 I agree with you that...

Hi jonjjj, I am not sure you are working problem #510 correctly. I solved it and got the same answer as the practice exam. You can view my solution complete with Free Body Diagrams from the dropbox link here: https://www.dropbox.com/s/v5jtfrgcr7ijufb/20170326_191621.jpg?dl=0  Try to compare to...

I did look into this myself and came to the same conclusion on the assumption that the 215 number includes a conversion factor to rev/min. I found a reference from a manufacturer of ball screws that gives the critical speed of the ball screws with a modification factor of Cs (see 1st dropbox...

Audi Driver, see excerpt below. For full notice you can see .pdf at this link http://www.ncbels.org/forms/decoupling final.pdf

Audi Driver, NC actually decoupled the exam for April 2017 and requires you to pass the NCEES PE exam BEFORE applying. This means the law/ethics test will actually be done AFTER the NCEES exam. I originally applied to sit for the April 2017 exam before they announced the decoupling and they...

I did the problems at the end of the first 5 chapters in Shigley's and after comparing them to the MERM Practice Problems I have decided to skip the rest of Shigley's end of the chapter problems. I don't think the MERM Practice Problems are as difficult as some people say, but the problems in...

I am taking the exam in North Carolina as well. North Carolina has a take home test with ethics / laws questions. It is part of the application and not part of the NCEES exam. See link below to access the application for North Carolina's website the Board exam is at the end of the application...

I will be taking the Machine Design exam in April 2017 also. My plan currently is to do all the problems in the Practice Problems for the Mechanical Engineering PE Exam by Lindeburg (13th edition / ISBN-13: 978-1591264156 Link: http://a.co/bV39HWm)  in the following topics Topic I: Background...