10th IMC 2003 Problems and Solutions
嗯，再顶起一个，不错哈。 w=12.5.*rand(1,10);
for i=1:10
th=0.7854;
Cd=0.2;rho=1.29;r=0.002;m=4/3*pi*r^3*1000;
K=Cd.*rho.*pi.*r.^2./2./m;g=9.8;H=5;
F=@(v) w(i).* (v.*sin(th)./g+sqrt(2.*(H+(v.*sin(th)).^2)./g))-1./K.*log((K.* (v.*sin(th)./g+sqrt(2.*(H+(v.*sin(th)).^2)./g))+1./(w(i)- cos(th).*v))./( 1./(w(i)- cos(th).*v)));
f=@(v) F(v)-15;
V=fzero(f,0);
plot(w(i),V,'k.'),xlabel('v'),ylabel('w')
hold on
end
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