Recent content by stpmmaths

There are 10 data values in my attached example. {51, 55, 57, 61, 62, 67, 70, 72, 73, 74} Q1 = 56.5 Q3 = 72.25 But Q1 = 57 Q3 = 72 instead

Based on the attachment https://www.physicsforums.com/attachment.php?attachmentid=44365&d=1330184818, is this the correct way to interpret quartile?

From the question, is the way to find Lower Quartiles and Upper Quartiles correct? I have seen books taking the 3rd and 8th (from the question) as Lower Quartiles and Upper Quartiles respectively. Which should be the correct Quartiles?

Is it related to the slipping which occurs during the test?

Question: Why is it not sensible to calculate the Young's modulus of the material (steel) when the experiments was conducted? But I thought it should be possible to calculate the Young's modulus after plotting the stress/strain curve. Young's modulus can be found by finding the gradient of...

Thanks a lot! :D Yup it gives the same answers.

So if the question is The angle I will be using is 120 or -60 deg, right?

Why is it 60 deg but not -30 deg? And how you see whether the line a-a is going to be the new x or y-axis?

B u m p! I just want to know the angle. Thanks.

B u m p!

Homework Statement Homework Equations The Attempt at a Solution I'm in doubt the angle that I should be using to solve σx' and Tx'y'. Is 60 degree or -30 degree? Ps: I know how to determine the principal stresses and max shear. Just the angle that I'm in doubt at. 60 -30

Thanks :D

Any help?

Sorry for bumping old thread. I just want to ask how can we find the 0.2% permanent set? Is it 0.002 strain? Or 0.002 multiply by sth, and what's that sth? Thanks.

Thanks :smile: