Friction, Spring Constant, Energy

AI Thread Summary
The discussion revolves around a physics homework problem involving friction, spring constant, and energy calculations. The user presents equations related to work, gravitational potential energy, and spring energy, seeking assistance with their calculations. They express uncertainty about their manipulation of the equations and provide a specific numerical attempt that resulted in a value of approximately 133.18. The urgency of the request is highlighted by the impending deadline for submission. Clarification on the equations and calculations is requested to ensure accuracy before turning in the assignment.
euphtone06
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Homework Statement


http://img339.imageshack.us/img339/4518/phys2lh6.gif


Homework Equations


W= -um2gh
m1gh=.5Kh^2-um2gh
.5K(h)^2
Final Eq?:
W=um2g*(2g(m1+um2)/K)


The Attempt at a Solution


.2(4)9.8*(2*9.8(7+.2(4))/9 = 133.1754667
I don't know if I went wrong in manipulating the equation but I suspect that's the issue?
 
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Sorry to bother you guys again but if I could please get some help tonight it would be much appreciated it must be turned in early tomorrow.
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
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Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

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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