Don't panic!* Morten Dam Jørgensen - Computerfysik.dk
Don't panic!* Morten Dam Jørgensen - Computerfysik.dk
Don't panic!* Morten Dam Jørgensen - Computerfysik.dk
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• Hvis vi hopper ud fra en Airbus<br />
A380 i 10 kilometers højde, har<br />
har ændringen i atmosfærens<br />
densitet så betydning?<br />
• Let’s find out!<br />
~Fdrag = 1<br />
2 ⇢(y)~v 2 CdA<br />
En adiabatisk atmosfære (don’t ask):<br />
⇢(y) =⇢0<br />
✓<br />
1<br />
1 y<br />
y0<br />
Frit fald<br />
◆ 1/( 1)<br />
rho0 = 1.2; % kg/m^4-1<br />
gamma = 1.4;<br />
y0 = 29400; % m<br />
rho = @(y) rho0 *(1 -<br />
(gamma-1)./gamma* y/y0).^(1/<br />
(gamma-1));<br />
while y > 0 % stop ved y=0<br />
t = t + dt;<br />
y = y + v .* dt;<br />
end<br />
dv_g = g .* dt;<br />
dv_d = dt./m .*<br />
(0.5*rho(y)* v^2*C_d*A);<br />
v = v + dv_g + dv_d<br />
plot(t,y,'b+')
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