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mas00097 wrote: ↑Wed Sep 11, 2024 1:17 am I am having trouble with the assignment. For problem one I am using a 253 equation for moment of inertia of a semi-circle, but it is giving me the wrong answer according to webwork. Is there something I need to use table A-18 for that is specific to the problem?
I am also having trouble with problem two. I found theta p, and I am trying to use the theta s equation in the powerpoint but webwork says its wrong. Is theta s supposed to be in a specific direction?

sd00002 wrote: ↑Wed Sep 11, 2024 8:05 pm

mas00097 wrote: ↑Wed Sep 11, 2024 1:17 am I am having trouble with the assignment. For problem one I am using a 253 equation for moment of inertia of a semi-circle, but it is giving me the wrong answer according to webwork. Is there something I need to use table A-18 for that is specific to the problem?
I am also having trouble with problem two. I found theta p, and I am trying to use the theta s equation in the powerpoint but webwork says its wrong. Is theta s supposed to be in a specific direction?

I used the equation (pi/8 - 8/9pi)r^4 for the I of the semi circle sub area. I was able to get the correct answer using that formula and then setting everything up in a table and using parallel axis.

As far as the direction of theta s it needs to be in the direction of your max tau.

If any one has any advice on number 4. I have gotten my shear and moment diagrams taken care of, and I got the compressive stress, but i cannot for the life of me get the tensile stress correctly.

cmj00012 wrote: ↑Wed Sep 11, 2024 10:52 pm

sd00002 wrote: ↑Wed Sep 11, 2024 8:05 pm

mas00097 wrote: ↑Wed Sep 11, 2024 1:17 am I am having trouble with the assignment. For problem one I am using a 253 equation for moment of inertia of a semi-circle, but it is giving me the wrong answer according to webwork. Is there something I need to use table A-18 for that is specific to the problem?
I am also having trouble with problem two. I found theta p, and I am trying to use the theta s equation in the powerpoint but webwork says its wrong. Is theta s supposed to be in a specific direction?

I used the equation (pi/8 - 8/9pi)r^4 for the I of the semi circle sub area. I was able to get the correct answer using that formula and then setting everything up in a table and using parallel axis.

As far as the direction of theta s it needs to be in the direction of your max tau.

If any one has any advice on number 4. I have gotten my shear and moment diagrams taken care of, and I got the compressive stress, but i cannot for the life of me get the tensile stress correctly.

I'm also having issues with finding the maximum tensile stress for #4. I'm positive I have the right answer but Webwork is saying it's wrong. I'm not sure what other approach to take here.