- #31
Shackleford
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hikaru1221 said:
The answer the back of the book has is very long and nasty. I don't know how to get their answer.
Electrical analog and impedance
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Homework Help Overview
The discussion revolves around the relationship between mechanical systems involving masses and damping forces and their electrical analogs, specifically focusing on impedance in circuits. Participants are exploring the differential equations governing the motion of two masses and how these can be related to an electrical circuit using electromechanical analogies.
Discussion Character
- Mixed
Approaches and Questions Raised
- Participants are attempting to derive the differential equations for two masses and relate them to an electrical circuit. Questions about the correct formulation of these equations and the implications of damping forces are raised. There is also discussion about substituting mechanical quantities with their electrical counterparts.
Discussion Status
Some participants have confirmed the correctness of the equations derived, while others are exploring how to construct the equivalent circuit and calculate impedance. There is an ongoing exchange of ideas about the relationships between the mechanical and electrical components, with hints and suggestions being provided to clarify the connections.
Contextual Notes
Participants are navigating the complexities of translating mechanical systems into electrical analogs, with specific attention to the assumptions made about forces and velocities. There is an acknowledgment of potential errors in the equations and the need for careful consideration of the circuit configuration.
The answer the back of the book has is very long and nasty. I don't know how to get their answer.
- #32
hikaru1221
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Well if you don't remember how to calculate impedance, you'd better review your knowledge 
Hint: Use the complex forms of impedance:
Z_R = R
Z_L = jL\omega
Z_C = -\frac{j}{C\omega}
Hint: Use the complex forms of impedance: Z_R = R
Z_L = jL\omega
Z_C = -\frac{j}{C\omega}
- #33
Shackleford
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hikaru1221 said:Well if you don't remember how to calculate impedance, you'd better review your knowledge
Z_R = R
Z_L = jL\omega
Z_C = -\frac{j}{C\omega}
Well, I put an equation for impedance in a previous post. The only difference is it's not in complex form. Why does it have to be in complex form?
http://i111.photobucket.com/albums/n149/camarolt4z28/2010-09-25233241.jpg?t=1285475708
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- #34
hikaru1221
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That's not the right one. That formula is only true for the case that there are only 3 elements R, L, C in series with the source (RLC circuit). It doesn't apply to this case where the circuit is much more complicated.
- #35
Shackleford
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hikaru1221 said:
Okay. Let me see what I can dig up in my Physics II book.
- #36
Shackleford
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Nope. The Physics II book only covers Series LRC circuit. This of course is a combination series and parallel LRC circuit.
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