Homework Question on resistors in series, in parallel

AI Thread Summary
The discussion revolves around a homework question involving resistors in parallel and series, focusing on applying Ohm's Law (V=IR) and Kirchhoff's Law. The initial attempt at a solution correctly identifies that the voltage drop across parallel resistors is the same, but the user becomes confused after this point. A critical issue noted is the absence of the attached image necessary for understanding the problem. Participants emphasize the importance of providing complete information for effective assistance. The conversation highlights the need for clarity in homework submissions to facilitate better guidance.
rabcdred
Messages
13
Reaction score
0

Homework Statement



See attached image.

Homework Equations



V=IR, Kirchoff's Law

The Attempt at a Solution


I thought that since the resistors are in parallel, the voltage drop across each one would be equivalent, so V=I1(14)=I2(38)=I3(7)=I4(Rx). From here I became stuck. Please help!
 

Attachments

  • Screen shot 2012-02-12 at 10.35.47 PM.png
    Screen shot 2012-02-12 at 10.35.47 PM.png
    17.9 KB · Views: 467
Last edited:
Physics news on Phys.org
rabcdred said:

Homework Statement


https://www.physicsforums.com/attachment.php?attachmentid=43838&stc=1&d=1329108468

Homework Equations



V=IR, Kirchoff's Law

The Attempt at a Solution


I thought that since the resistors are in parallel, the voltage drop across each one would be equivalent, so V=I1(14)=I2(38)=I3(7)=I4(Rx). From here I became stuck. Please help!

Homework Statement



Homework Equations



The Attempt at a Solution

Hello rabcdred. Welcome to PF !

No image !

Invalid attachment.
 
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...
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...
Back
Top