An Elementary Treatise On the Dynamics of a System of Rigid Bodies. With Numerous Examples
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12 &c. = &c. Also since T is a homogeneous function of the second order in ql,q^..-t[n w^e have dT dT Hence the equation of vis viva may be written in the form 2(^+;.)=^2/-Hf^;-i- (D). ON THE GENERAL EQUATIONS OP MOTION. i251 The quantities g',', q^...qj maybe eliminated from the equations (A') and (D), and we have a partial differential equation, which may be written in the form of a determinant, to find F. Also if we consider the initial value of T, we shall have another equation of a similar... form with a^,a^. . .a„ written instead of q^, q^. . .q^. It is necessary that the function F should satisfy both these equations. If we wrote PitP^--- for -j— , -j— . . . this process of finding q,'qj... from the equations (A') and substituting in the equa- tion of vis viva exactly corresponds to the Hamiltonian pro- cess of expressing Zf= T— U in terms of p^,p^...qi,q^...H then we write the Hamiltonian function H in the form the differential equation to find V will be 173. By the preceding reasoning all the integrals of a dynamical system of equations can be expressed in terms of the differential coeflScients of a single function V.
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