Rigid Body Kinetics Homework Help - Solving Equations & Finding Answer

AI Thread Summary
The discussion revolves around a rigid body kinetics homework problem involving the equations ΣM = Iα and ΣF = ma. The user has attempted to solve the problem but believes their answer is incorrect and is seeking assistance. Despite the urgency expressed due to time constraints, there has been no response or suggestions from other forum members. The user is looking for guidance to resolve the issue and clarify their approach. Prompt help is requested to ensure timely completion of the homework.
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Homework Statement


21njnnb.png


Homework Equations


\SigmaM = I\alpha
\SigmaF = ma

The Attempt at a Solution


I have made an attempt at this problem, it can be seen in the image below. I think I have done everything correctly, but my answer is incorrect. Any help would be greatly appreciated.
2dmf8ed.png
 
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Any ideas?
 
...no ideas. Come on guys I'm running out of time!
 

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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