For shape 2, it is located on the y-axis. If that is the case, shouldn't we be using b^3h/3? Just want to make sure I see this correctly. Thank you for your hard work!
Shouldn’t “d” be the distance from the centroid to the axis, instead of the distance from the centroid of a section to the centroid of the whole part?? That would be for the moment about the centroidal axis, the question says moment about the x and y axis’s.
Hi GeniePrep. I'm not sure this solution is correct. Radius of gyration: r_x = sqrt( I_x / A ) I_x = I_xc + d_y^2 *A At 2:55 onwards, to find r_x, you used the I_x about the figure's horizontal centroidal axis (which is I_xc), instead of the I_x about the x-axis.
Wait. Sorry, I think I got confused by the FE Handbook's confusing explanation of the Radius of Gyration (pg 96). Its explanation says "from a reference axis", but it'd be clearer to instead say "from its centroidal axis". Furthermore, the equation for the radius of gyration should be: r_x = sqrt( I_cx / A)
Thus, looking back at the problem 0:23, the problem can be more clearly worded, "The radii of gyration about the centroidal x-axis and the centroidal y-axis, respectively, are..."
Can this problem be found in the PE? Or is this just in the FE? I’d love to see a video that shows problems NOT to expect on the PE that would be in the FE. THANKS! 🙏🙏
Hi Naweed. Thank you for watching. This depends on your budget, here is a videos where Kenza recommends the best study material to prepare for the FE: ua-cam.com/video/CGzHyi0Y8X8/v-deo.html. We also have this free playlist with 100+ practice problems to solve, ua-cam.com/video/Lzq-rgRsE-I/v-deo.html&pp=gAQBiAQB. I hope this helps. Good luck with your FE.
For shape 2, it is located on the y-axis. If that is the case, shouldn't we be using b^3h/3? Just want to make sure I see this correctly. Thank you for your hard work!
Shouldn’t “d” be the distance from the centroid to the axis, instead of the distance from the centroid of a section to the centroid of the whole part?? That would be for the moment about the centroidal axis, the question says moment about the x and y axis’s.
for a 2L6×3½×1/2 member where would the radius of gyration in the y direction depend on the separation while the radius of gyration in the x wouldn't?
Hi GeniePrep. I'm not sure this solution is correct.
Radius of gyration: r_x = sqrt( I_x / A )
I_x = I_xc + d_y^2 *A
At 2:55 onwards, to find r_x, you used the I_x about the figure's horizontal centroidal axis (which is I_xc),
instead of the I_x about the x-axis.
Wait. Sorry, I think I got confused by the FE Handbook's confusing explanation of the Radius of Gyration (pg 96). Its explanation says "from a reference axis", but it'd be clearer to instead say "from its centroidal axis". Furthermore, the equation for the radius of gyration should be:
r_x = sqrt( I_cx / A)
Thus, looking back at the problem 0:23, the problem can be more clearly worded,
"The radii of gyration about the centroidal x-axis and the centroidal y-axis, respectively, are..."
Can this problem be found in the PE? Or is this just in the FE? I’d love to see a video that shows problems NOT to expect on the PE that would be in the FE. THANKS! 🙏🙏
How can I find a lot of practice problem and accurate material for studying?
Hi Naweed. Thank you for watching. This depends on your budget, here is a videos where Kenza recommends the best study material to prepare for the FE: ua-cam.com/video/CGzHyi0Y8X8/v-deo.html. We also have this free playlist with 100+ practice problems to solve, ua-cam.com/video/Lzq-rgRsE-I/v-deo.html&pp=gAQBiAQB. I hope this helps. Good luck with your FE.
hope I pass!!!
We hope so too! Best of luck, Mariam! Keep us posted! 😄