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huishui
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L.D.Landau's book <Mechanics> first page have below word:
if all the co-ordinates and velocities are simultneously specified,it is known from experience that the state of system is completely determined and that its subsequent motion can,in principle,can be calculated.Mathematically,this means that,if all the co-ordinates q and velocites dq/dt aregiven at some instant,the accelerations d^2q/dt^2 at that instant are uniquely defined.
so how to from q and dq/dt ==> d^2q/dt^2 ?
equipollent problem
why Lagrangian cannot contain d^2q/dt^2 or high-term ?
excuse me for bad english
if all the co-ordinates and velocities are simultneously specified,it is known from experience that the state of system is completely determined and that its subsequent motion can,in principle,can be calculated.Mathematically,this means that,if all the co-ordinates q and velocites dq/dt aregiven at some instant,the accelerations d^2q/dt^2 at that instant are uniquely defined.
so how to from q and dq/dt ==> d^2q/dt^2 ?
equipollent problem
why Lagrangian cannot contain d^2q/dt^2 or high-term ?
excuse me for bad english
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