Recent content by gregorspv

  1. gregorspv

    The efficiency of a heat engine

    Oh, I must have made a typo; the actual problem is to express the efficiency of C in terms of B. Not sure why they're labelled that way though. I believe the heat flows ##Q_{in}## were determined correctly? I expressed the temperatures in terms of pressure, volume and ##T_1## via Charles's...
  2. gregorspv

    The efficiency of a heat engine

    The first picture was provided along the problem statement. The second has my annotations. I initially began by calculating the ratio of efficiencies, since the work done is obviously the same and cancels out, but after failing and having seen the form of the solution I saw that that cannot...
  3. gregorspv

    Removing connections between equipotential points in solving circuits?

    D'oh – it had occurred to me that my reasoning would lead to removing virtually any wire, but I could not have found a way out were it not for your edifying response. Thank you! I find it remarkable that some people just happen to get this intuitively (the solution I was provided with does not...
  4. gregorspv

    Removing connections between equipotential points in solving circuits?

    I think I see what you're saying, but it still seems odd to me that there can be a voltage drop (potential difference) between two points on a perfect conductor. Or else how are the wires removed in Fig. 4 connecting points of different potential?
  5. gregorspv

    Removing connections between equipotential points in solving circuits?

    Oh, I did not word that correctly. In Fig. 4 the connections between equipotential points from Fig. 2 were removed. Perhaps then equipotentiality is not a valid criterion for removal, but rather the absence of current? Would you care to explain why there is no current in the wires removed in Fig. 3?
  6. gregorspv

    Removing connections between equipotential points in solving circuits?

    A sketch of the setup and the equivalent circuit are attached. I believe the correct way to solve this is to redraw the circuit as shown in Fig. 3 and then remove the connections between evidently equipotential points, which reduces the problem to a familiar setup of in parallel and in series...
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