Recent content by mouser

  1. M

    Thermodynamics - obtaining quenching entropy

    Wow, thanks for all the responses everyone :). OK so here is what I came up with, and it seems to be giving me the right answer, but just for future reference: s2-s1 = mmCpm ln(T2/Tm1) + mwCpw ln(T2/Tw1)
  2. M

    Thermodynamics - obtaining quenching entropy

    I did find a relationship, but it is returning negative values for me, so something is amiss... s2 - s1 = Cp ln(T2/T1) I'm trying to find the total entropy change. Would that mean that I sum the entropy change in the quenched metal and the water?
  3. M

    Thermodynamics - obtaining quenching entropy

    I'm having a problem determining the total entropy change in a metal quenching problem. Here is the information I am given (subscript 'm' is for metal, 'w' is water): mm = 20 kg mw = 1000 kg T1m = 800 C T1w = 30 C Cpm = .4 kJ/kg K Cpw = 4.18 kJ/kg K With this information, I found T2...
  4. M

    Power Series Representation of e^(sin(x))

    Also, by (Inf Sum, n=0), I meant \sum Thanks
  5. M

    Power Series Representation of e^(sin(x))

    Does anyone have any advice here? I have an exam tomorrow, for which I am almost fully prepared. With my luck though, this problem will be on the exam and I'll be screwed! Any help would be much appreciated!
  6. M

    Power Series Representation of e^(sin(x))

    Homework Statement Find the power series representation of the following: f(x) = e^(sin(x)) Homework Equations I know this to be true: e^x = (Inf Sum, n=0) (x^n/n!) The Attempt at a Solution So, in substituting sin(x) for x, I get: e^(sin(x)) = 1 + sin(x)/1 + sin(x)/2 + sin(x)/6 + ...
  7. M

    Solving for t in SHM (complex solution)

    The question was "at what time does the mass pass through the equilibrium position heading downward for the second time?" I just figured out where I went wrong. The answer I got previously was only partially correct. For the correct answer I added the value for one full period and it checks...
  8. M

    Solving for t in SHM (complex solution)

    Thanks! If I rearrange it to be: 2/3cos10t = 1/2sin10t 4/3cot10t = 1 3/4tan10t = 1 tan10t = 4/3 t = (tan^-1(4/3))/10 The answer is incorrect. Did I make a mistake in that algebra? Thank you for your help!
  9. M

    Solving for t in SHM (complex solution)

    Hey guys, this is my first post, I was hoping you all could offer some advice. I'm facing a problem involving free undamped SHM. Everything is working out well so far but I ran into a problem when trying to find t. Here's what I have: x(t) = -2/3cos10t + 1/2sin10t Now, if I want to find...
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