Kirchoff's Laws Current [Problem 1]

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The discussion focuses on solving for the currents I1, I2, and I3 in a circuit using Kirchhoff's Laws. The user expresses frustration over multiple failed attempts to find the correct solution, indicating a struggle with substituting equations effectively. Key equations referenced include Kirchhoff's Loop Rule and Kirchhoff's Series Law. The user requests assistance in showing the correct equations to use for the problem. Overall, the thread highlights the challenges of applying Kirchhoff's Laws in circuit analysis.
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Homework Statement


Determine the currents I1, I2, and I3. R5 = 18[PLAIN]http://www.webassign.net/images/omegacap.gif. Assume the internal resistance of each battery is r = 1.0 [PLAIN]http://www.webassign.net/images/omegacap.gif.

Homework Equations


Kirchoff's Loop Rule: I1+I2+I3=0
Kirchoff's Series Law?: V1+V2+V3=0

The Attempt at a Solution


I've tried a million things, but with no luck. I know I'm supposed to substitute the different equations, but I just can't seem to come up with the right answer.
19-40alt.gif
 
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Show us your equations.

Chet
 

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'

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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