- #1
sara_87
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Homework Statement
I have notes on mechanics, and under the titile equation of motion/ static equilibrium there is the equation:
[tex]\rho[/tex][tex]\frac{\partial^2(u_i)}{\partial(t)^2}[/tex]-[tex]\frac{\partial(\sigma_{ij})}{\partial(x_j)}[/tex]=fi(x,t)
Homework Equations
The Attempt at a Solution
I know that rho is the density, t is time, sigma is stress but what does the 'u' and 'f' represent?
thank you