Recent content by Mewniew

So here are my attempts: (1) https://dl.dropboxusercontent.com/u/34732003/h/20151011_220232.jpg I stopped, because i wasnt sure what i was doing and it felt like nonsense. (2) https://dl.dropboxusercontent.com/u/34732003/h/20151011_220130.jpg Numbers show the order in which i did things. 1...

I hadn't heard of it, and i haven't learned determinant yet, either :F

Dont i have 4 equations and 6 unknowns? The scalars and a,b and c?

Thank you for answering! For (2), that is a typo, it's supposed to say ℝ3. I still don't quite understand what I am supposed to do.

EDIT: I think i screwed up and posted in the wrong section. Sorry. Should i make a new one to the correct place? Can this one be moved? Hello. I have a couple of problems here, that i will have to translate from another language, so I am not 100% sure if I am using the correct terms. (1) Let...

Right, got it. https://dl.dropboxusercontent.com/u/34732003/IMG_20150213_220656.jpg . Happened to do another exercise today that helped me a bit with this one. Took a look at my earlier notes, damn i must've been tired. I think i need a break :F

Show me how you get that 5/7 and 2/7 sharing My notes: https://dl.dropboxusercontent.com/u/34732003/IMG_20150212_180625.jpg (dropbox, because its too large) Where did i go wrong?

Alright. H=3.9179m ≈ 3.9m, then?

H=1.750m (1.8m, rounded to 2 significant digits) ? My calculation assumes that all the potential energy of ball1 is transferred to ball2, at least i think it does :f

Yes, dean barry, that's pretty much what i had. The m's cancel out. I already got to the correct answer, now its just a matter of making sure i understand the whys and hows.

Okay, i think this is starting to make sense now. This is how i get there Ftotal=T+G=man direction defined: T=man- mg sin(θ) set T=0=m(v2/r - g sin(θ)) Right? Solve for v, insert into the energy equation, solve for the other v and done. So the components of G are what i missed in the first...

thats not a hint, that's the solution :s Based on that, I did the calculations and got to 5.6m/s, but i don't know why. I need someone to explain this "v^2 / r = g sin(35°)". What is it and where does it come from? multiply it by g, you get an/g=sin(35) from what i can tell sin(35) should...

It was, i just hadn't had the time to act on it by the time i answered :p So, in the beginning, there is tension T and gravity G. ∑F=T+G=man, which is the total force acting on the ball, resulting in an inward acceleration (an). Right? At the point θ=125°, the string goes slack and T=0 and the...

Damn, i was afraid that might be it. Dont really know what to do with that information Up to that 125°, but not beyond. So, i guess i'll try to figure out the ball's x-velocity at the top and add it to the E equation.

Homework Statement (Im translating this from another language, so if it doesn't make any sense, please let me know and ill try to do a better job.) A metal ball (mass=120g) is hanging from a string (lenght=85cm). The ball is struck horizontally. When the angle of the swing reaches 125 degrees...