If a system is inequilibrium and the positionof the system depends uponmany independent variables - the principle of virtual workstates that the partialderivatives of its totalpotential energy with respectto each of the independentvariable must be

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If a system is inequilibrium and the positionof the system depends uponmany independent variables - the principle of virtual workstates that the partialderivatives of its totalpotential energy with respectto each of the independentvariable must be