- #1
P3X-018
Linear DE in Kinematics
Hey
I would like to know, how it is possible to solve the following
differentialequations
[tex]\ddot{x}(t)+\alpha \dot{x}(t)^2=0[/tex]
and the one that really gives troubles
[tex]\ddot{y}(t)+\alpha\dot{y}(t)^2=-g[/tex]
when given that [tex]x(0)=0[/tex], [tex]y(0)=0[/tex], [tex]\dot{y}(0)=v_0\sin \theta[/tex] and [tex]\dot{x}(0)=v_0\cos \theta[/tex]. Where [tex]\alpha=k/m[/tex]. The problem in equation 2 is, that i can't even solve the integral
[tex]\int \frac{1}{-g-\alpha \dot{y}^2}\:d\dot{y}[/tex]
Doing the substitution here doesn't get get me anywhere. Maybe someone have made this problem before, it's motion in 2-dimensions, with
airresistance. The 2 equations comes from
[tex]m\vec{a}=\vec{F}_g - \vec{F}_{airr}[/tex]
Hey
I would like to know, how it is possible to solve the following
differentialequations
[tex]\ddot{x}(t)+\alpha \dot{x}(t)^2=0[/tex]
and the one that really gives troubles
[tex]\ddot{y}(t)+\alpha\dot{y}(t)^2=-g[/tex]
when given that [tex]x(0)=0[/tex], [tex]y(0)=0[/tex], [tex]\dot{y}(0)=v_0\sin \theta[/tex] and [tex]\dot{x}(0)=v_0\cos \theta[/tex]. Where [tex]\alpha=k/m[/tex]. The problem in equation 2 is, that i can't even solve the integral
[tex]\int \frac{1}{-g-\alpha \dot{y}^2}\:d\dot{y}[/tex]
Doing the substitution here doesn't get get me anywhere. Maybe someone have made this problem before, it's motion in 2-dimensions, with
airresistance. The 2 equations comes from
[tex]m\vec{a}=\vec{F}_g - \vec{F}_{airr}[/tex]
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