Recent content by ME_student

I transfer next term as a junior. I would say Sophomore year was a lot of fun. I did pretty well in all my engineering classes.

Do you like math, phy, science, programming, circuits analysis, not having a life (social life), and studying all the time? If you like the following then I say go for it!

I think it's best for me to put this question here than to make a new thread. Apologies for threading jacking. I am a student who is about to enter junior year for mechanical engineering. Do we have any petroleum engineers here on physics forum? I was wondering what classes were like junior...

OP didn't know what a FBD was so I was going to start helping him/her by having him/her draw some FBD. BTW Mr. Chet if he used correct FBD's he wouldn't be here asking us questions. Obviously OP must have analyzed something wrong on his/her free body diagram.

Lets see some FBD's first.

This is how I think about it. Since we have T=1/2mv^2, T is nothing more than energy. Is energy a scalar or vector? It's a scalar, has no direction. So I believe energy doesn't have a direction so the negative sign will disappear. I used T instead of V since we use T a lot in dynamics.

Starting with block A Sum of the forces in x direction, right being plus (+) Equation 1: -T-mu_s*FN1-MU_s*FN2+W_A*sin (25)+Pcos (25)=0 Zero because the block is static. Sum of the forces in y direction, up being plus (+) Equation 2: FN1-FN2-W_A*cos (25)+P*cos (25)=0 Now looking at block...

How's that?

Not trying to be a smarty pants but that's why you rotate the image and zoom into identify the images and calculatuons. Let me try to rotate the images...

Okay I can do that... Next time. :smile:

Well I manage to figure out part A and part B of the question... Still let's discuss why my P force is wrong. Let me retake a few pics. Better?

Homework Statement I feel like I've spent way too much time on this problem... So the given information is on the image along with all my work. I am finding the acceleration of the block and the tension in the cable. I know R is going to be the same in all the cords because the pulleys are mass...

Sorry for the small iMage. I got it figured out.

Homework Statement So I'd rather not type out the whole equation I am differentiating with respect to t... Sorry admins. My written work is on the image. I just want to make sure my work is correct. Homework Equations The equation is a differential characteristic equation with cos and sin...