math_boss

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math_boss
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5
  • Eigenranking

    My matrix was matrix = [

      [0,2,4,1,1],

      [1,0,3,2,1],

      [3,4,0,1,2],

      [1,3,3,0,4],

      [4,3,1,4,0]

    ]

    The eigen ranking was:

    Team 5: rating = 0.5351649756702808
    Team 4: rating = 0.516996248452163
    Team 3: rating = 0.43493231817629663
    Team 1: rating = 0.3710347855055461
    Team 2: rating = 0.3456593618764917
    

    Team 5 was the best team.

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  • Modeling a steady state heat distribution in 2D

    Given the conditions of my problem with $\kappa=0$ and $f=0$ the temperature at the lower right hand corner of the bar at steady state is 0.75700.


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  • Modeling 2D Heat Flow

    The temperature of the midpoint at the insulated edge at t=1s is 0.16587 as shown in the image below.


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  • Steady state heat flow with source

    Heat flow with a constant internal heat source is governed by:

    $$u_t=1u_{xx}+3, u(0,t)=1, u(1,t)=2.$$

    Since this is a steady state temperature distribution, $u(t)=0$ since $u(x,t)$ does not change with time. Thus,

    $$1u_{xx}+3=0.$$

    Solving for $u_{xx}$ yields $u_{xx}=-3$. Integrating this twice with provide the result,

    $$u(x,t)=-\frac{3}{2}x^2+Ax+B,$$

    where A and B are two constants. Solving for A and B using the initial conditions of $u(0,t)=1, u(1,t)=2$ produces the steady state distribution of

    $$u(x,t)=-\frac{3}{2}x^2+\frac{5}{2}x+1.$$

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  • A random vibration problem

    The displacement of the midpoint from equilibrium at time t=1.9s is -0.028.


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