Solving Physics Homework: A Frustrating Struggle

AI Thread Summary
The discussion centers on the challenges faced while solving a physics homework problem involving impulse and energy conservation. The user initially attempted to apply impulse-momentum principles but ended up with the wrong answer, expressing frustration over their struggle. They acknowledged overlooking the simple equation v = vo + a*t, which could have simplified their approach. The conversation highlights the importance of seeking different perspectives when tackling complex problems. Ultimately, the user reflects on the learning experience, emphasizing that sometimes a fresh viewpoint can lead to a solution.
stinlin
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Homework Statement


See link.

http://img515.imageshack.us/img515/6383/picture15lj9.jpg


Homework Equations



Imp = integral F dt
mv = momentum
mgh
1/2 mv^2

The Attempt at a Solution



I drew to FBD's to find the impulses and such, but I just don't know what to do. I then tried to use impulse momentum combined with conservation of energy, but got the WRONG answer. I can take a picture of my work, but it'll mean nothing...
 
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I was interested in solving this problem, but it turned out to be trickier than I thought it was...maybe I suck? heheanyways, google helped me find this:

https://www.physicsforums.com/archive/index.php/t-72193.html

looks familiar doesn't it?how frustrating...somehow I overlooked the use of v = vo + a*t

so simple when you get another perspective, sometimes you get tunnel vision and want to solve it your own way but there are better ways

anyways blah...rambling
 
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Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
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