Finding the Coefficient for No Movement: Homework Solution

AI Thread Summary
To determine the coefficient of friction required for an object not to move, the acceleration must be zero. The force of friction must equal the applied force for the object to remain stationary. The discussion indicates that the user has calculated acceleration with a coefficient of 0.1 but struggles to find the necessary coefficient for no movement. Understanding the balance of forces is crucial to solving this problem. The user acknowledges a lack of complete information about the problem context.
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Homework Statement


So basically this is a two part question, first part was find acceleration of the system (which i already found) with a coefficient of friction of 0.1. B) asks you what coefficient you need for the object not to move?



Homework Equations





The Attempt at a Solution


So I figured the acceleration has to be 0 for the object not to move, and I played around and stuff but nothing really got me the answer I needed. I understand that the force of friction must equal the force applied without friction.. I think :/
 
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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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