Recent content by johny2012

  1. J

    How to find the roots of polynomial of a 5.th order

    Thanks for the valuable information. I tried this online polynomail root solver and entered the polnomial coefficients, and the these results. Instead of 1.0e+003 * 4.8369 I get 4836.92716144589 and others are x2: -646.021532813122 x3: -1878.065197692127 +...
  2. J

    How to find the roots of polynomial of a 5.th order

    Homework Statement I have a polynimal equation as this - 0.00000000000049125*T^4 + 0.00000000021358333333333333333333333333333*T^3 + 0.00000290233125*T^2 - 0.032444109375*T + 19.891472013020833333333333333333 Homework Equations The Attempt at a Solution I insert those...
  3. J

    How to get one variable from one equation?

    This is my final view of code for m-file function[] = eq() cpammonia = '(0.03515 + 2.954.*10.^(-5)).* t + (0.4421.*10.^(-8)) .* t.^2 - (6.686.* 10.^(-12)).* t.^3'; integral = quad(cpammonia,25,650); Qa = (520/(17*10^-3))*integral Qair = -25200-Qa; nair=48842 %nDH = -7 - Qa %hava için...
  4. J

    How to get one variable from one equation?

    Ralyy thanks man, that one helped me but I have still problems.. I tried it with solve(eq2) It does not accept T, just wrote eq2 as you wrote and got nearly same result as you -4539.3367635382526862930496142306 705.04842574482273638074048051504...
  5. J

    How to get one variable from one equation?

    Hey Rey, thanks man Yeah you are right that expression does not have, I have omitted it but that one is equal to a sacalar valur, (nDH /nair) and I also tried it but as fas as I understand, MATLAB "solve" function works with at least two equations, but in my case I have one. nDH /nair =...
  6. J

    How to get one variable from one equation?

    Homework Statement In manufacture of nitric acid, ammonia and prehated air are mixed to form a gas containing 10 mole %NH3 at 650 C. If ammonia enters the gas blending unit at 25C at a rate o 520kg/? and heat is lost from the mixer to its surroundings at a rate of 7 kW, determine the...
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