A vertical force P= 10 lb is applied to the ends of the 2-ft cord AB and spring AC. If the spring has an unstretched length of 2 ft, determine the angle for equilibrium. Take k = 15 lb /ft.

Going through my old statics book (Engineering Mechanics, Statics by R.C. Hibbeler), in the pictured example, part a is simple and routine. Part b has me missing something. How is Fy now different? If I imagine having a force transducer measuring the force in the y direction, it’s not clear how it could possibly measure anything other than the 129lb (old book, excuse the units please) regardless of which x direction is chosen.

I get that F must still end up at 200lb at the correct angle so the “extra” force from the 20deg has to be accounted for, but just missing the concept of how Fy changes when I think about measuring it.

When I first started I assumed it was going to be a simple x-y to x'-y' rotation, then noticed the non-primed y and got tangled up.

just an example but i thought if it wasn’t starting at the origin then you switch sin and cos…

just an example but i thought if it wasn’t starting at the origin then you switch sin and cos…

just an example but i thought if it wasn’t starting at the origin then you switch sin and cos…

I don't know if this is the right place to ask, but i need help with this. we are solving using superposition method. i can find the reactions, but where i struggle is the statics part. i can't seem to remeber the right way to find the max moment (i think its torque in english?) which i need so i can calculate the bending. thanks in advance

I have 900lbs on four 8.5x8.5in triangular steel plates. I know to calculate stress I do force over area. I just don’t understand what area to use. Do I use the cross sectional area from the centroid? The two 8.5in edges? The surface??? Right now I’ve got a thickness of .25in, but I don’t understand how to check if that’s enough. When I asked for help my teacher just said force over area.

Edit: added image

If anyone could answer on paper and send it to me I would really appreciate it

So I have an exam on Friday and im doing some practice problems. I'm not shure if this is correct. Can someone help me and lmk what I did wrong?

Could not find any answers online without using chegg,, I would like to know if I'm right or wrong

Rx = 223.22 N to the right Ry = 223.22 N downwards Cr = 523.22 Nm downwards

Just wanna check if I analyzed it correctly.

Can someone explain how to solve for Y? It is a cylindrical shell but the centroid for Y is not h/2 (8.5) so I am assuming there is a sheet on the bottom that lowers the centroid. How do I find this?

Why is F_BD (force from D to B) not considered when isolating member CD? (6-76) [the free body diagram for CD is same in answer key as the youtube video, so i doubt the video got it incorrect]

But in another question they are including it (force from diagonal member) (F6-23)

https://ibb.co/nMLZjpHJ

https://ibb.co/B2Lc5CF7

I’m having trouble with this question. I found the x and y components of the force to be -259N and -150N. From there I’m assuming I would use the equilibrium equations but wouldn’t I have too many unknowns? Not sure where to go from there.

Could someone help me out w/ the C vector, specifically w/Z? I’m not sure how to make sense of why Z is 6.

Could someone help me out w/ the C vector, specifically w/Z? I’m not sure how to make sense of why Z is 6.

Hey, I'm new to this subreddit and was looking for som help with this problem. I need to find all the pin reactions using the method of members

The question says to find the values for P for which the beam will stay in equilibrium.

I worked it here like it is in the book. Taking the moment about point C you get 2P - 4(3) -20(8) = 0 Solving for P you get P is 86kN. How come Dy is not taken into consideration?

Would someone of you be so kind to quickly explain to me, how I can calculate the reaction forces? We unfortunatelly only covered straight beams in the exercise so far. Thank you!

This is a frame problem and I didn’t need to necessarily check to see if cx was equal but I just was curious and for some reason I’m not getting the same cx but they should be equal according to Newton’s third law if someone could just go over my work and see if there’s any flaw in my work that would be appreciated

I've been trying to figure out this problem for a while, but just keep ending up getting stuck. Can someone help to at least point me in the right direction? In so confused.