Recent content by JoeyBob

  1. J

    Does the derivative of a P(V) eqn give the eqn for change in Pressure?

    So it would be rate of change with respect to volume?
  2. J

    How to calculate initial pressure and temperature - adiabatic process

    So I use final volume and pressure for this? I treid that and it didnt give the right answer for me.
  3. J

    How to calculate initial pressure and temperature - adiabatic process

    http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/adiab.html
  4. J

    Does the derivative of a P(V) eqn give the eqn for change in Pressure?

    Gives rate of change. For instance, if you take the derivative of velocity, you get acceleration, which is the rate of change of velocity.
  5. J

    Does the derivative of a P(V) eqn give the eqn for change in Pressure?

    I know the integral of a P(V) eqn gives an eqn for work. I was wondering if taking the derivative of a P(V) eqn gives an eqn for change in pressure?
  6. J

    How to calculate initial pressure and temperature - adiabatic process

    Im confused on working backwards so to speak to find adiabatic work. To find work for this adiabatic process, I either need to know the change in temperature OR the initial pressure (I think?). The issue is that I don't know either the initial temperature nor the initial pressure so I am not...
  7. J

    Fish Reflection: Analyzing Light's Interactions with Water

    You know what, after thinking about it and reading it a few more times I think I know what it means. The fish 3.5 m above the mirror. The fish is also 3.5 m deep. So the mirror is actually 7m deep. Very poorly worded question. Since the mirror is underneath, I can find the location of the...
  8. J

    Calculate change in entropy per minute.

    For the ice at 273.15 K, its being heated up (dQ/dt is positive). where here dQ/dt is per min (not second) DeltaS=dQ/dt/T=3910000/273.15 = 14314 For the steam at 373.15, its being cooled down (dQ/dt is NEGATIVE) -3910000/373.15 = -10478 Add them up and I get a total change of 3836... close...
  9. J

    Calculate change in entropy per minute.

    The heat absorbed by the ice-water mixture is the heat emitted by the steam-water mixture. I divided it by temperature because that gives the right units and is consistent with the equation Q=T*change in entropy I suppose I need to find the temperature of the interphase maybe instead? Here...
  10. J

    Calculate change in entropy per minute.

    So what I did was find the change in Q per min. Mass melted per min * latent heat capacity = Q per min = 11.5 kg /min * 3.4*10^5 J/kg = 3910000 J/min Now the equilibrium temperature is 100 degrees Celsius or 373.15 degrees kelvin. If I do 3910000 J/min / 373.15 K I get 10478 J/(K*min). This...
  11. J

    Fish Reflection: Analyzing Light's Interactions with Water

    So let's pretend there was a person right above the water looking down and I wanted to find how deep the reflection of the fish appeared to be to the person. Is that when I would use n1/p+n2/q=(n2-n1)/R where n2 is 1.29 and p=3.5?
  12. J

    Fish Reflection: Analyzing Light's Interactions with Water

    The way I read "3.5m above" was above the water since why else would refractive indexes even be given? If we assume its 3.5 above the fish, then 1/q+1/p=-2/R, where p=3.5m and R=6.2m This does indeed give -1.644 m or 1.644 m behind the mirror. What a dumb question. Who knows what the right...
  13. J

    Fish Reflection: Analyzing Light's Interactions with Water

    i think this is where I am confused. The light is coming from the fish. but then it needs to come back to the fish for the fish to see itself. First light comes off fish and hits water. Then light travels through air and hits mirror. Then light goes back through air and hits water. Then goes...
  14. J

    Solving Destructive Interference: Angle vs Wavelength

    i see, I was using a double slit eqn instead of a single slit. Looking at your link, tanx=x=y/D. So i don't know what y is nor d. d=y/x=y/0.108 = 9.2593y Now I can use y=(m*wavelength*D)/a to find width. m i assume is 2 because second angle measurement... 0.108d=(2*539 nm *d)/a a=9981.4815...
  15. J

    Fish Reflection: Analyzing Light's Interactions with Water

    So first I looked at where the image of the fish appeared to be when it went through the water surface. since we can assume the water is flat, R is infinity, so n1/p=-n2/q. plugging in the values (n1=1.29, n2=1, p=3.5) I get q=-0.3686. So the image of the fish appears at 0.369 above the...
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