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MathGroup Archive 2007

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Simple equation won't plot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg82917] Simple equation won't plot
  • From: "Bert Aerts (rm x)" <bert.aertsx at advalvasx.be>
  • Date: Sat, 3 Nov 2007 03:27:03 -0500 (EST)

When I type following commands in Mathematica 6.0.1:
m = 70; a = 0.08; x0 = 5000; g = 9.81;
x[t_] = x0 - m*Log[Cosh[t*Sqrt[g*a]/Sqrt[m]]]/a;
P1ot[x[t], {t, 0, 60}]
I don't get a plot, but instead:
P1ot[5000 - 875. Log[Cosh[0.105884 t]], {t, 0, 60}]
How can I get a real plot? I tried [N[x[t]] and Evaluate[x[t]] but nothing
worked...
Why is t_ used in the second equation?
The source of these equations is Ferdinand F. Cap's book "Mathematical
methods in physics and engineering with Mathematica"



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