1. The problem statement, all variables and given/known data
In "Methods of theoretical physics" from the authors Morse and Feshbach is writen:
" The displacement (dx,dy,dz) is perpendicular to the surface if the component displacemetn satisfy the equation:
How to prove this relation?
2. Relevant equations
the relevant equation is the equation of total change
3. The attempt at a solution
In "Methods of theoretical physics" from the authors Morse and Feshbach is writen:
" The displacement (dx,dy,dz) is perpendicular to the surface if the component displacemetn satisfy the equation:
How to prove this relation?
2. Relevant equations
the relevant equation is the equation of total change
3. The attempt at a solution
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